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Crystal structures and luminescent properties of two isostructural Zn(Ⅱ) complexes constructed from L-tert-leucine Schiff bases ligands 认领 引用
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作者 XU Xuebin CHEN Jie +1 位作者 WANG Gaofeng SONG Shaofei 《无机化学学报》 SCIE CAS CSCD 北大核心 2026年第6期1312-1320,共9页
Two isostructural coordination polymers[Zn(L)(HCOO)]n(Zn-LFor)and[Zn(L)Cl]n(Zn-LCl)were synthesized by a hydrothermal method based on HL·NaX(HL=2-{[(pyridin-4-yl)methyl]amino}-3,3-dimethylbutanoic acid,X-=HCOO^(-... Two isostructural coordination polymers[Zn(L)(HCOO)]n(Zn-LFor)and[Zn(L)Cl]n(Zn-LCl)were synthesized by a hydrothermal method based on HL·NaX(HL=2-{[(pyridin-4-yl)methyl]amino}-3,3-dimethylbutanoic acid,X-=HCOO-,Cl-).Zn-LFor and Zn-LCl belong to the orthorhombic system with space group P212121,which exhibit distorted square pyramidal structures.Interestingly,the values of the trigonality factor(τ5)are distinctively different.Zn-LCl has aτ5 value of 0.144,while the value ofτ5 for Zn-LFor is only 0.089.Zn-LFor displayed an excellent fluorescence property,which can be used as a fluorescence probe to detect Cr2O72-in H2O solution with high selectivity and sensitivity,with a quenching constant(KSV)of 2.23×104 L·mol-1.The detection limit of Cr2O72-was calculated from the experimental data,and the value was 1.03μmol·L-1.CCDC:2503298,Zn-LFor;2503302,Zn-LCl. 展开更多
关键词 Schiff bases coordination polymer Cr2O72- luminescent property
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DABCO-catalyzed [3+4] annulations of Schiff bases with α-substituted allenes: Construction of functionalized benzazepine derivatives 认领 引用
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作者 Ke Wu Xiuqin Ruan +2 位作者 Shuolei Jia Enyuan Wang Qingfa Zhou 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第7期397-401,共5页
A[3+4]annulation of α-substituted allenes and Schiff bases is reported.This methodology serves as a conduit for the construction of a series of biologically important benzazepine derivatives in good to excellent yiel... A[3+4]annulation of α-substituted allenes and Schiff bases is reported.This methodology serves as a conduit for the construction of a series of biologically important benzazepine derivatives in good to excellent yields under mild conditions by an unprecedented mode involving β’-carbon of α-substituted allenes and the proposed mechanism is supported by capturing the intermediate.Moreover,this class of benzazepine derivatives exhibited potential ability of cytotoxicity toward cancer cells. 展开更多
关键词 DABCO Tertiary amine Allene Benzazepine Schiff base Annulation Cytotoxicity
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Research and Application of Assessment of Wind Energy in Large-Scale Wind Power Bases 认领 引用
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作者 Ling Yuan Ling Bai +4 位作者 Jianke Li Peng Chen Haichuan Long Xia Ruan Qi Luo 《Journal of Environmental & Earth Sciences》 CAS 2025年第2期117-128,共12页
Improving the accuracy of the evaluation of the performance of wind farms in large wind power bases located in complex terrain under the actual atmosphere is crucial to the sustainable development of wind power.To thi... Improving the accuracy of the evaluation of the performance of wind farms in large wind power bases located in complex terrain under the actual atmosphere is crucial to the sustainable development of wind power.To this end,this study combined the Weather Research and Forecasting(WRF)model with the Wind Farm Parameterization(WFP)method to investigate the wake characteristics and operational performance of large onshore wind farms in the complex terrain of Jiuquan City,Gansu Province,China.The research results showed that after verification,the systematic error of the WRF simulations was less than 3%.The WRF model and the WFP scheme simulated a significant warming phenomenon within the wind power base area,while a cooling effect was observed outside.The analysis of the wake effects indicated that the impact of PhaseⅠconstruction on PhaseⅡconstruction of the wind power base was minimal.During the operation of the entire wind power base,the wind speed within the wind farm decreased by approximately 10%,and the influence range of the predominant wind direction extended over a hundred kilometers downwind.The research conclusions provide a powerful scientific basis for optimizing design and operation,improving efficiency,minimizing the negative impacts on adjacent wind turbines,and ensuring the sustainable development of wind energy through dynamic planning and scientific assessment. 展开更多
关键词 Large-Scale Wind Power Base Mesoscale Simulation Risk Assessment Performance Evaluation and Improvement
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The Evolution of Regional Economic Resilience in the Old Industrial Bases in China: A Case Study of Liaoning Province, China 认领 引用 被引量：9
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作者 LI Liangang ZHANG Pingyu +2 位作者 LO Kevin LIU Wenxin LI Jing 《Chinese Geographical Science》 SCIE CSCD 2020年第2期340-351,共12页
The economic transformation of the old industrial bases is a key research topic among geographers in China.In this paper,we propose that the concept of regional economic resilience(RER)has unique theoretical value in ... The economic transformation of the old industrial bases is a key research topic among geographers in China.In this paper,we propose that the concept of regional economic resilience(RER)has unique theoretical value in analyzing the economic transformation of the old industrial bases.We constructed an analytical framework and an index system and applied the conceptual tools to study the evolution of RER in the old industrial base of Liaoning Province in China,which is currently subjected to not only sudden shocks but‘slow burn’—longer term processes of change that may nevertheless affect the regional economy.There are four main findings:first,the evolution of RER in Liaoning can be divided into four stages from 2000 to 2015.Liaoning is currently in its conservation-release period,and the next stage will be a release-reorganization period.Second,the RER of the majority of the studied cities is lower than the average value for Liaoning,and this is mainly attributed to the relatively weak vulnerability-resistance and adaptability-transformation capacity of these cities.Third,the RER levels of the 14 cities in Liaoning differ significantly.At the first level is Shenyang and Dalian,at the second level is Dandong and Yingkou,and the third level comprises the remaining cities.Fourth,regional economic resilience is mainly determined by vulnerability-resistance,which indirectly reflects Liaoning’s lack of adaptability-transformation capacity,and the ability of the region to renew or create a new development path is weak. 展开更多
关键词 regional economic resilience(RER) evolutionary process old industrial bases Liaoning Province,China
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Interactions of sulfuric acid with common atmospheric bases and organic acids: Thermodynamics and implications to new particle formation 认领 引用 被引量：4
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作者 Yunfeng Li Haijie Zhang +2 位作者 Qingzhu Zhang Yisheng Xu Alexey B.Nadykto 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第9期130-140,共11页
Interactions of the three common atmospheric bases,dimethylamine((CH3)2 NH),methylamine(CH3 NH2),ammonia(NH3),all considered to be efficient stabilizers of binary clusters in the Earth’s atmosphere,with H2 SO4,the ke... Interactions of the three common atmospheric bases,dimethylamine((CH3)2 NH),methylamine(CH3 NH2),ammonia(NH3),all considered to be efficient stabilizers of binary clusters in the Earth’s atmosphere,with H2 SO4,the key atmospheric precursor,and 14 common atmospheric organic acids(COAs)(formic,acetic,oxalic,malonic,succinic,glutaric acid,adipic,benzoic,phenylacetic,pyruvic,maleic acid,malic,tartaric and pinonic acids)have been studied using the density functional theory(DFT)and composite high-accuracy G3 MP2 method.The thermodynamic stability of mixed(COA)(H2 SO4),(COA)(B1),(COA)(B2)and(COA)(B3)dimers and(COA)(H2 SO4)(B1),(COA)(H2 SO4)(B2)and(COA)(H2 SO4)(B3)trimers,where B1,B2 and B3 refer to(CH3)2 NH,CH3 NH2 and NH3,respectively,have been investigated and their impacts on the thermodynamic stability of clusters containing H2 SO4 have been studied.Our investigation shows that interactions of H2 SO4 with GOA,(CH3)2 NH,CH3 NH2 and NH3 lead to the formation of more stable mixed dimers and trimers than(H2 SO4)2 and(H2 SO4)2(base),respectively,and emphasize the importance of common organic species for early stages of atmospheric nucleation.We also show that although amines are generally confirmed to be more active than NH3 as stabilizers of binary clusters,in some cases mixed trimers containing NH3 are more stable thermodynamically than those containing CH3 NH2.This study indicates an important role of COA,which coexist and interact with that H2 SO4 and common atmospheric bases in the Earth atmosphere,in formation of stable prenucleation clusters and suggests that the impacts of COA on new particle formation(NPF)should be studied in further details. 展开更多
关键词 bases particle atmospheric
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Synthesis of Schiff bases of naphtha[1,2-d]thiazol-2-amine and metal complexes of 2-(2'-hydroxy)benzylideneaminonaphthothiazole as potential antimicrobial agents 认领 引用 被引量：4
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作者 AZAM Faizul SINGH Satendra +1 位作者 KHOKHRA Sukhbir Lal PRAKASH Om 《Journal of Zhejiang University-SCIENCE B》 EI CAS 2007年第6期446-452,共7页
Objective： A series of 2-benzylideneaminonaphthothiazoles were designed and synthesized incorporating the lipophilic naphthalene ring to render them more capable of penetrating various biomembranes. Methods： Schiff ... Objective： A series of 2-benzylideneaminonaphthothiazoles were designed and synthesized incorporating the lipophilic naphthalene ring to render them more capable of penetrating various biomembranes. Methods： Schiff bases were synthesized by the reaction of naphtha[1,2-d]thiazol-2-amine with various substituted aromatic aldehydes. 2-（2＇-Hydroxy）ben- zylideneaminonaphthothiazole was converted to its Co（Ⅱ）, Ni（Ⅱ） and Cu（Ⅱ） metal complexes upon treatment with metal salts in ethanol. All the compounds were evaluated for their antibacterial activities by paper disc diffusion method with Gram positive Staphylococcus aureus and Staphylococcus epidermidis and Gram negative Escherichia coli and Pseudomonas aeruginosa bacteria. The minimum inhibitory concentrations of all the Schiff bases and metal complexes were determined by agar streak dilution method. Results： All the compounds moderately inhibited the growth of Cram positive and Gram negative bacteria. In the present study among all Schiff bases 2-（2＇-hydroxy）benzylideneaminonaphthothiazole showed maximum inhibitory activity and among metal complexes Cu（Ⅱ） metal complex was found to be most potent. Conclusion： The results obtained validate the hypothesis that Schiff bases having substitution with halogens, hydroxyl group and nitro group at phenyl ring are required for the antibacterial activity while methoxy group at different positions in the aromatic ring has minimal role in the inhibitory activity. The results also indicated that the metal complexes are better antibacterial agents as compared to the Schiff bases. 展开更多
关键词 Schiff bases Metal complexes Antimicrobial
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Simultaneous determination of ten nucleosides and bases in Ganoderma by micellar electrokinetic chromatography 认领 引用 被引量：2
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作者 Feiya Sheng Songsong Wang +3 位作者 Xiao Luo Jianbo Xiao Linfeng Hu Peng Li 《Food Science and Human Wellness》 SCIE CAS CSCD 2022年第2期263-268,共6页
Ganoderma(lingzhi)is a famous herbal medicine and edible supplement in oriental countries for a long history.In this study,a simple micellar electrokinetic chromatography(MEKC)method was established for the analysis o... Ganoderma(lingzhi)is a famous herbal medicine and edible supplement in oriental countries for a long history.In this study,a simple micellar electrokinetic chromatography(MEKC)method was established for the analysis of nucleosides and bases,the major bioactive components in Ganoderma for the first time.By optimizing the borate concentration,the sodium dodecyl sulfate(SDS)concentration and the pH value of running buffer,10 nucleosides and bases achieved an ideal separation.In real sample analysis,the developed method was successfully used to determine the 10 target analytes in 23 batches of Ganoderma samples from different regions.Results indicated that contents of 10 investigated analytes in each sample showed obvious variation.The principal components analysis(PCA)and hierarchical cluster analysis(HCA)analysis classified the samples into three groups,and the HCA tree visualized the relationships which was mainly contributed by geographical partition.The results indicated geographical origin to be an important factor that affect the accumulation of nucleosides and bases in Ganoderma.In summary,this study provides a simple and practical strategy for quality assessment and cultivation reference of Ganoderma. 展开更多
关键词 Ganoderma Nucleosides Bases Micellar electrokinetic chromatography Quality assessment
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The de novo genome assembly of Tapiscia sinensis and the transcriptomic and developmental bases of androdioecy 认领 引用 被引量：2
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作者 Peng Zhao Guiliang Xin +4 位作者 Feng Yan Huan Wang Xiaolong Ren Keith Woeste Wenzhe Liu 《Horticulture Research》 SCIE 2020年第1期219-234,共16页
Tapiscia sinensis(Tapisciaceae)possesses an unusual androdioecious breeding system that has attracted considerable interest from evolutionary biologists.Key aspects of T.sinensis biology,including its biogeography,gen... Tapiscia sinensis(Tapisciaceae)possesses an unusual androdioecious breeding system that has attracted considerable interest from evolutionary biologists.Key aspects of T.sinensis biology,including its biogeography,genomics,and sexlinked genes,are unknown.Here,we report the first de novo assembly of the genome of T.sinensis.The genome size was 410 Mb,with 22,251 predicted genes.Based on whole-genome resequencing of 55 trees from 10 locations,an analysis of population genetic structure indicated that T.sinensis has fragmented into five lineages,with low intrapopulation genetic diversity and little gene flow among populations.By comparing whole-genome scans of male versus hermaphroditic pools,we identified 303 candidate sex-linked genes,79 of which(25.9%)were located on scaffold 25.A 24-kb region was absent in hermaphroditic individuals,and five genes in that region,TsF-box4,TsF-box10,TsF-box13,TsSUT1,and TsSUT4,showed expression differences between mature male and hermaphroditic flowers.The results of this study shed light on the breeding system evolution and conservation genetics of the Tapisciaceae. 展开更多
关键词 breeding flowers bases
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Experimental Podophyllotoxin (Bajiaolian) Poisoning:Ⅲ. Biochemical Bases for Toxic Effects 认领 引用 被引量：1
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作者 C.M. YANG JOU-FANG DENG +3 位作者 C.F. CHEN AND LOUIS W. CHANG (Department of Pharmacotogy, Chang Gung Medical College, Kwei-San, Tao Yuan, Taiwan, China Poison Control Center, Department of Medicine,The Veterans General Hospital-Taipei, Taipei, Taiwan, China 《Biomedical and Environmental Sciences》 SCIE CAS 1994年第3期259-265,共7页
The biochemical mechanism underlying the toxicity of podophyllotoxin is investigated.Previous studies from our laboratories suggested that hepatocytes were extremely sensitive to the toxicity of podophyllotoxin and a ... The biochemical mechanism underlying the toxicity of podophyllotoxin is investigated.Previous studies from our laboratories suggested that hepatocytes were extremely sensitive to the toxicity of podophyllotoxin and a disruption of protein synthesis was suspected.Dose-response and time-course studies on the effects of podophyllotoxin on protein, RNA,and DNA syniheses on hepatocellular cultures were made. Inhibitions of protein, RNA,and DNA syntheses were demonstrated, and a direct correlated dose-response relationshipon such effects was also evident. Inhibition of protein synthesis appeared to be a direet toxic effect of podophyllotoxin and occurred independently from that of RNA. The reduction of DNA synthesis was reflected by a reduction of H3-thymidine incorporation,which is believed to be the consequence of inhibition on the mitotic activity by podophyllotoxin 展开更多
关键词 RNA Poisoning Bajiaolian Biochemical Bases for Toxic Effects Experimental Podophyllotoxin
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Synthesis and Spectral Properties of Mixed-Ligand Complexes of Lanthanide Perchlorate with Bis-(phenylsulfinyl)ethane and Organic Lewis Bases 认领 引用 被引量：1
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作者 张若桦 卜显和 +1 位作者 孙心琳 王永生 《Journal of Rare Earths》 SCIE EI CAS 1997年第2期11-15,共5页
Six lanthanide complexes with bis(phenylsulfinyl)ethane(bphse) and organic bases(phen: 1,10 phenanthroline and bipy: 2,2'-bipyridine) were synthesized and characterized by elemental analysis, conductance and spect... Six lanthanide complexes with bis(phenylsulfinyl)ethane(bphse) and organic bases(phen: 1,10 phenanthroline and bipy: 2,2'-bipyridine) were synthesized and characterized by elemental analysis, conductance and spectral (IR, UV Visible) data. The complexes were Ln(bphse) 2(bipy)(ClO 4) 3· n H 2O and Ln 2(bphse) 3(phen) 2(ClO 4) 6·H 2O(where Ln=Nd, Eu and Gd; n =0～2). IR spectral data confirmed that the lanthanide ions were coordinated by oxygen atoms from bphse and nitrogen atoms from phen or bipy. Exitation and emission spectra of Eu complexes were measured and discussed. 展开更多
关键词 Rare earths Complex synthesis Spectral properties Bis(phenylsulfinyl)ethane Organic bases
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Correspondence Between Bell Bases and Oriented Links in Knot Theory 认领 引用 被引量：4
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作者 QIANShang－Wu GUZhi－Yu 《Communications in Theoretical Physics》 SCIE CAS 2002年第6期659-662,共4页
From the comparison of correlation tensor in the theory of quantum network, the Alexander relation matrix in the theory of knot crystals and the identical inversion relations under the action of Pauli matrices, we sho... From the comparison of correlation tensor in the theory of quantum network, the Alexander relation matrix in the theory of knot crystals and the identical inversion relations under the action of Pauli matrices, we show that there is a one to one correspondence between four Bell bases and four oriented links of the linkage in knot theory. 展开更多
关键词 Bell bases correlation tensor in the theory of quantum network Alexander relation matrix in the theory of knot crystals linkage 4(1) inversion relations under the action of Pauli matrices
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Characterizing some gossypol and gossypolone Schiff's bases by studying their fragmentation patterns with electrospray ionization tandem mass spectra 认领 引用
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作者 Long Zhang Xing Xin Cao +2 位作者 Hai Xia Jiang Biao Jiang Yu Xin Cui 《Chinese Chemical Letters》 SCIE CAS 2009年第6期716-719,共4页
To investigate the structural form of gossypol and gossypolone Schiff＇s bases, seven relevant Schiff＇s bases were synthesized and the electrospray ionization-tandem mass spectrometry （ESI-MS/MS） with low-energy co... To investigate the structural form of gossypol and gossypolone Schiff＇s bases, seven relevant Schiff＇s bases were synthesized and the electrospray ionization-tandem mass spectrometry （ESI-MS/MS） with low-energy collision-induced dissociation was used to analyze their fragmentations. A common fragmentation pathway with the loss of RNH2 from those schiff＇s bases quasi-molecular ions was observed and proposed on the basis of their MS/MS spectra data. This common pathway indicated that those Schiff＇s bases existed mainly as the enamine form not the imine form previously showed in most reports. 展开更多
关键词 Gossypol Schiff＇s bases Gossypolone Schiff＇s bases ESI-MS Enamine form Imine form
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A facile and convenient synthesis of novel imidazo[1,2-b] isoxazoles and their Mannich bases as potential biodynamic agents 认领 引用 被引量：2
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作者 E.Rajanarendar K.Thirupathaiah +1 位作者 S.Ramakrishna D.Nagaraju 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第12期1511-1513,共3页
A series of novel imidazo[1,2-b]isoxazoles 3 and their Mannich bases 4–6 were synthesized via convenient reactions. The reaction of 3-aminoisoxazole 1 with substituted phenacyl bromides 2 in dry ethanol afforded the ... A series of novel imidazo[1,2-b]isoxazoles 3 and their Mannich bases 4–6 were synthesized via convenient reactions. The reaction of 3-aminoisoxazole 1 with substituted phenacyl bromides 2 in dry ethanol afforded the corresponding 6-methyl-3-aryl imidazo[1,2-b]isoxazoles 3 in good yields.Compounds 3 on treatment with 37% formaline and secondary amines furnished the corresponding novel Mannich bases viz., 6-methyl-3-aryl-2-（morpholine/pyrrolidin-1-yl/piperidin-1-yl）-methyl-imidazo[1,2-b]isoxazoles 4–6. 展开更多
关键词 convenient facile bases substituted amines antibacterial acetic chloroform ethanol pyrrolidine
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Synthesis, in vitro antitumor activity and molecular modeling studies of a new series of benzothiazole Schiff bases 认领 引用 被引量：1
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作者 Moustafa T.Gabr Nadia S.El-Gohary +2 位作者 Eman R.El-Bendary Mohamed M.El-Kerdawy Nanting Ni 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第3期380-386,共7页
A new series of benzothiazole Schiff bases 3–29 was synthesized and screened for antitumor activity against cervical cancer（Hela） and kidney fibroblast cancer（COS-7） cell lines. Results indicated that compounds 3... A new series of benzothiazole Schiff bases 3–29 was synthesized and screened for antitumor activity against cervical cancer（Hela） and kidney fibroblast cancer（COS-7） cell lines. Results indicated that compounds 3, 14, 19, 27 and 28 have promising activity against Hela cell line with IC50 values of 2.41,3.06, 6.46, 2.22 and 6.25 mmol/L, respectively, in comparison to doxorubicin as a reference antitumor agent（IC50 2.05 mmol/L）. In addition, compound 3 displayed excellent activity against COS-7 cell line with IC50 value of 4.31 mmol/L in comparison to doxorubicin（IC50 3.04 mmol/L）. In the present work,structure based pharmacophore mapping, molecular docking, protein-ligand interaction, fingerprints and binding energy calculations were employed in a virtual screening strategy to identify the interaction between the compounds and the active site of the putative target, EGFR tyrosine kinase. Molecular properties, toxicity, drug-likeness, and drug score profiles of compounds 3, 14, 19, 27, 28 and 29 were also assessed. 展开更多
关键词 Benzothiazole Schiff bases Antitumor activity Molecular modeling In silico studies
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Piecewise Sparse Recovery in Union of Bases 认领 引用 被引量：1
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作者 Chongjun LI Yijun ZHONG 《Journal of Mathematical Research with Applications》 CSCD 2023年第3期363-378,共16页
Sparse recovery(or sparse representation) is a widely studied issue in the fields of signal processing, image processing, computer vision, machine learning and so on, since signals such as videos and images, can be sp... Sparse recovery(or sparse representation) is a widely studied issue in the fields of signal processing, image processing, computer vision, machine learning and so on, since signals such as videos and images, can be sparsely represented under some frames. Most of fast algorithms at present are based on solving l0or l1minimization problems and they are efficient in sparse recovery. However, the theoretically sufficient conditions on the sparsity of the signal for l0or l1minimization problems and algorithms are too strict. In some applications, there are signals with structures, i.e., the nonzero entries have some certain distribution. In this paper,we consider the uniqueness and feasible conditions for piecewise sparse recovery. Piecewise sparsity means that the sparse signal x is a union of several sparse sub-signals xi(i=1, 2,..., N),i.e., x=(x1T, x2T,..., xNT)T, corresponding to the measurement matrix A which is composed of union of bases A=[A1, A2,..., AN]. We introduce the mutual coherence for the sub-matrices Ai(i = 1, 2,..., N) by considering the block structure of A corresponding to piecewise sparse signal x, to study the new upper bounds of ‖x‖0(number of nonzero entries of signal) recovered by both l0and l1optimizations. The structured information of measurement matrix A is exploited to improve the sufficient conditions for successfully piecewise sparse recovery and also improve the reliability of l0and l1optimization models on recovering global sparse vectors. 展开更多
关键词 piecewise sparse recovery union of bases mutual coherence greedy algorithm BP method
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An Extension to SU_f^3 and Dirac Particle of the Transformation between Physical Bases and Symmetry Bases for Dibaryon States 认领 引用 被引量：1
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作者 Ping Jialun Wang Fan T.Goldman 《Chinese journal of nuclear physics》 EI 1994年第1期26-29,共4页
The transformation between physical bases and symmetry bases is extendedfrom SU_f^2 to SU_f^3.Its application in dibaryon calculation for both nonrelativistic andrelativistic quark model is discussed.
关键词 Transformation Physical bases Symmetry bases Dibaryon Quark model
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Antibacterial Activity and Structure-Activity Relationships of Schiff Bases on Staphylococcus aureus by Microcalorimetry 认领 引用
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作者 HOU Hanna ZHU Juncheng +3 位作者 QI Zude ZHOU Bo LI Meiying LIU Yi 《Wuhan University Journal of Natural Sciences》 CAS 2010年第1期71-77,共7页
The growth of Staphylococcus aureus under the action of six kinds of Schiff bases（A,B,C,D,E,F） was studied by means of microcalorimetry. Growth constant k and inhibition ratio I were calculated. Also,the antibacteri... The growth of Staphylococcus aureus under the action of six kinds of Schiff bases（A,B,C,D,E,F） was studied by means of microcalorimetry. Growth constant k and inhibition ratio I were calculated. Also,the antibacterial activity,the action characteristics and the structure-activity relationships of the compounds on S. aureus were analyzed. Results indicate that B,F show good antibacterial activity（IC50：293.6 mg · L-1 and 307.8 mg · L-1） ,D,E show moderate antibacterial activity（IC50：966.3 mg · L-1 and 1 126.7 mg · L-1） ,and A,C just show weak antibacterial activity（IC50 〉1 200 mg · L-1） . The I-c curves mainly present a straight line shape for B,D,E and F,but an inverse ＂S＂ shape for A and C. Structure-activity relationships analysis suggests that the species and position of the substituents determine the antibacterial activity of these Schiff bases,and the charge density distribution is one of the most important influencing factors. 展开更多
关键词 Schiff bases Staphylococcus aureus microcalorimetry antibacterial activity structure-activity relationships
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The applications of Schiff bases in Ti-catalyzed asymmetric alkynylation of aldehydes 认领 引用
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作者 Xian Jia Lu Yin +1 位作者 Xuan Zhao Xing Shu Li 《Chinese Chemical Letters》 SCIE CAS 2007年第3期275-278,共4页
Sciff bases 1 and 2, .which were derived from chiral aminoalcohols, were used as figands in Ti-catalyzed asymmetric alkynylation of aldehydes. Good enantioselectivities （up to 88% ee） and high chemical yields （80-... Sciff bases 1 and 2, .which were derived from chiral aminoalcohols, were used as figands in Ti-catalyzed asymmetric alkynylation of aldehydes. Good enantioselectivities （up to 88% ee） and high chemical yields （80-90%） were obtained. 展开更多
关键词 Stiff bases Ti-catalyzed Alkynylation
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Synthesis, characterization and biological activities of Schiff bases derived from 2-hydroxy-3-nitrobenzaldehyde 认领 引用
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作者 Monisola Itohan Ikhile Marthe Carine Djuidje Fotsing +2 位作者 Charmaine Ardeme Jane Catherine Ngila Derek Tantoh Ndinteh 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2017年第12期858-871,共14页
Four novel Schiff bases were synthesized by the condensation reaction of 2-hydroxyl-3-nitrobenzaldehyde with either benzothiazoles or benzimidazolamines. The compounds 1–4 were characterized by spectroscopic and anal... Four novel Schiff bases were synthesized by the condensation reaction of 2-hydroxyl-3-nitrobenzaldehyde with either benzothiazoles or benzimidazolamines. The compounds 1–4 were characterized by spectroscopic and analytical methods. The crystal structures of 6-methoxy-1,3-benzothiazol-2-amine and compound 2 are reported only. The 6-methoxy-1,3-benzothiazol-2-amine was found to crystallize in the orthorhombic crystal system in the space group Pbca, having eight molecules in the unit cell, while compound 2 was found to crystallize in the monoclinic crystal system in the space group P2_1/c. The biological activities of these compounds were investigated by evaluating their antibacterial, antifungal, antimalarial, anti-HIV and anti-trypanosomiasis activities. These compounds displayed very interesting antibacterial, antifungal, antimalarial, anti-trypanosomiasis, anti-HIV and low cytotoxicity activity against HeLa cells. 展开更多
关键词 Schiff bases Biological activity Synthesis X-ray diffraction Characterization
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Synthesis, Thermochromic Properties and Thermal Behavior of some Schiff Bases.Part I. p,p'-Diaminodiphenylmethane-Schiff Bases and Sulphonamide Schiff Base 认领 引用
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作者 Chuan Fang ZHU Han Hong XU Sang Jun YANG 《Chinese Chemical Letters》 SCIE CAS 2001年第8期687-690,共4页
p,p'-Diaminodiphenylmethane-Schiff bases (SB) of general formula (R)-phCH=N- ph-CH2-ph-N=CHph(R), where R is p-NO2, m-NO2, p-OH, o-OH, p-Cl, -H, p-OCH3, and sul- phonamide Schiff bases (SB) of general formula (R)-... p,p'-Diaminodiphenylmethane-Schiff bases (SB) of general formula (R)-phCH=N- ph-CH2-ph-N=CHph(R), where R is p-NO2, m-NO2, p-OH, o-OH, p-Cl, -H, p-OCH3, and sul- phonamide Schiff bases (SB) of general formula (R)-phCH=N-ph-SO2NH2, where R is p-NO2, m-NO2, p-OH, o-OH, p-Cl, -H, p-OCH3, were synthesized and their structure have been characterized by the melting pointing, 1HNMR, MS, and elemental analysis. They are thermolabile and undergo thermo-chromism and thermal decomposition after melting. The TG. and DSC measurement were recorded in dynamic air and interpreted. 展开更多
关键词 p p’-Diaminodiphenylmethane Schiff bases thermochromic sulphonamide.
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