Studies on lanthanide complexes of the tripodal ligand bis(2-benzimidazolylmethyl)(2-pyridylmethyl)amine. Crystal structures and luminescence properties †
We present poly(aspartic acid) grafting bis-amine conjugates as artificial nucleases, which can effectively induce double-strand DNA cleavage.
我们提出聚天冬氨酸接枝双胺共轭物作为人工核酸酶,可以有效诱导双链DNA裂解。
Structures and fluorescent properties of picolinato zinc(II) and cadmium(II) complexes based on tridentate and tetradentate benzimidazole ligands
作者:Rui Feng、Fang-Fang Huang、Jia-Li Yuan、Zheng Lu、Tao Fang、Feng-Mei Nie
DOI:10.1080/00958972.2016.1238464
日期:2016.12.16
Abstract Five picolinato zinc(II) and cadmium(II) complexes, [Zn(ntb)(pic)]ClO4·CH3OH·2H2O (1), [Zn(bbma)(pic)]NO3·2CH3OH (2), [Cd(ntb)(pic)]ClO4·0.75CH3OH·H2O (3), [Cd2(bbma)2(pic)2](ClO4)2 (4), and [Cd2(bbp)(bbp-H)(pic)2(C2H5OH)]ClO4 (5), have been synthesized, where pic is the anion of picolinic acid, ntb is tris(2-benzimidazolylmethyl)amine, bbma is bis(benzimidazol-2-yl-methyl)amine, and bbp is
Bisbenzimidazole Derivatives as Potential Antimicrobial Agents: Design, Synthesis, Biological Evaluation and Pharmacophore Analysis
作者:Ronak Haj Ersan、Kayhan Bolelli、Serpil Gonca、Aylin Dogen、Serdar Burmaoglu、Oztekin Algul
DOI:10.1007/s11094-021-02389-x
日期:2021.5
In an attempt to design and synthesize a potent class of antimicrobials, 1,2-phenylenediamine derivatives were reacted with various aliphatic and heteroaliphatic dicarboxylic acids to generate a small library of 26 head-to-head bisbenzimidazole compounds (16 – 42) using the polyphosphoric acid method. These compounds were screened for their antibacterial activity and their antifungal activity. Compound 25 showed maximum potency against both Gram-positive and Gram-negative bacterial strains with minimum inhibitory concentration (MIC) values in the range of 7.81 – 31.25 μg/mL. In particular, it showed the maximum MIC values of 7.81 μg/mL against Gram-negative bacteria, which was four-fold more active than the standard drug ampicillin (MIC = 32.25 μg/mL). Compound 19 was found to be the most active against S. aureus with a MIC value of < 3.90 μg/mL, whereas the remaining compounds showed only low-to-moderate activity. Furthermore, all compounds exhibited low activity against all fungal strains in comparison to the standard drug fluconazole. I addition, pharmacophore hypotheses were generated to analyze structure–activity relationships between the molecular structures and antimicrobial activities on E. coli. This pharmacophore model can be useful in order to design new antimicrobial drugs. It can be suggested that the substitution of a phenyl ring at the 5/6 and 5′/6′ positions in symmetric bisbenzimidazole derivatives produces compounds with promising antimicrobial activity.
A polymerisation catalyst comprising (1) a transition metal compound of Formula A, and optionally (2) an activating quantity of a Lewis acid activator, Formula (A), wherein Z is a five-membered heterocyclic group containing at least one carbon atom, at least one nitrogen atom and at least one other hetero atom selected from nitrogen, sulphur and oxygen, the remaining atoms in the ring being nitrogen or carbon; M is a metal from Group 3 to 11 of the Periodic Table or a lanthanide metal; E
1
and E
2
are divalent groups from (i) aliphatic hydrocarbon, (ii) alicyclic hydrocarbon, (iii) aromatic hydrocarbon, (iv) alkyl substituted aromatic hydrocarbon (v) heterocyclic groups and (vi) heterosubstituted derivatives of groups (i) to (v); D′ and D
2
are donor groups; X is an anionic group, L is a neutral donor group; n=m=zero or
1
; y and z are zero or integers. The catalysts are useful for polymerising or oligomerising
1
-olefins.
isomerization processes in phenoxido-bridged mixed-valent FeIIFeIII complexes that contain either one aniline or one anilide ligand. In this work, we compare the properties of similar complexes bearing one terminal protic ligand, either aniline or 1H-benzimidazole. Whatever the ligand, 1H NMR spectroscopy clearly evidences that the complexes are present in CH3CN as a mixture of cis- and trans-isomers in
我们之前已经研究了苯氧基桥接的混合价Fe II Fe III配合物中的顺式/反式异构化过程,该配合物包含一种苯胺或一种苯胺配体。在这项工作中,我们比较了带有一个末端质子配体(苯胺或1 H-苯并咪唑)的类似络合物的性质。无论是哪种配体,1 H NMR光谱都清楚地表明,络合物以接近1:1的比例存在于CH 3 CN中,为顺式和反式异构体的混合物。我们在这里显示NEt 3的添加确实允许这些配体去质子化,所得的带有苯胺或苯并咪唑啉的配合物配位到三价铁上。后者是与苯并咪唑啉配体配位的高旋转三价铁离子的奇异实例。苯胺化合物的反式异构体占绝对优势,而苯并咪唑类化合物则是等比例的顺式和反式异构体的混合物。此外,循环伏安法研究表明,具有1 H-苯并咪唑的Fe III Fe III配合物比苯胺对应物更稳定,而去质子化的物质则相反。