Synthesis, spectral characterisation of 2-(5-methyl-1H-benzimidazol-2-yl)-4-bromoitro-phenols and their complexes with zinc(II) ion, and solvent effect on complexation

Tavman A

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Synthesis, spectral characterisation of 2-(5-methyl-1H-benzimidazol-2-yl)-4-bromoitro-phenols and their complexes with zinc(II) ion, and solvent effect on complexation

机译：2-（5-甲基-1H-苯并咪唑-2-基）-4-溴/硝基酚及其与锌（II）离子的配合物的合成，光谱表征及溶剂对配合的影响

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2-(5-Methyl- 1H-benzimidazol-2-yl)-4-bromoitro-phenois (liLBr and HLNO2) and their Zn(II) complexes with ZnX2 (X = Cl, I, NO3) were synthesized and characterized by elemental analysis, molar conductivity, IR, H-1 and C-13 NMR spectra. The OH proton appears near the NH protons in the H-1 NMR spectra of the ligands because of the strong intramolecular hydrogen bonding between the OH hydrogen and the C=N nitrogen atoms. The complexation is investigated in ethanol and isopropanol and it is observed that isopropanol is a better solvent than ethanol for the complex forming. HLBr gives harder complexation reaction with Zn(II) according to HLNO2 because of the stronger intramolecular hydrogen bonding in HLBr, and the both ligands react easier with Zn(NO3)2 than ZnCl2 and ZnI2. The Zn(II) complexes of HLBr have 1:1 M:L ratio and ionic character, however, HLNO2 give a non-ionic complex that has 1:2 M:L ratio. In the complexes the phenolic hydrogen is eliminated and a chelate structure is formed. (c) 2005 Elsevier B.V. All rights reserved.

机译：合成并表征了2-（5-甲基-1H-苯并咪唑-2-基）-4-溴/硝基苯酚（liLBr和HLNO2）及其与ZnX2（X = Cl，I，NO3）的Zn（II）配合物通过元素分析，摩尔电导率，IR，H-1和C-13 NMR光谱分析。 OH质子出现在配体的H-1 NMR光谱中的NH质子附近，这是因为OH氢与C = N氮原子之间存在强大的分子内氢键。在乙醇和异丙醇中研究了络合作用，发现在形成络合物时，异丙醇是比乙醇更好的溶剂。由于HLBr中更强的分子内氢键作用，HLBr与Zn（II）的络合反应更加困难，并且两个配体与Zn（NO3）2的反应比ZnCl2和ZnI2更容易。 HLBr的Zn（II）配合物具有1：1的M：L比和离子特性，但是HLNO2可以提供具有1：2 M：L的非离子配合物。在配合物中，酚氢被消除并形成螯合物。（c）2005 Elsevier B.V.保留所有权利。

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《Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy》 |2006年第2期|共6页
作者
Tavman A;
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正文语种 eng
中图分类分析化学;
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zinc(II) complexes; 2-(5-methyl-1H-benzimidazol-2-yl)-4-bromoitro-phenols; solvent effect; DYNAMICS; STATE;

机译：锌（II）配合物;2-（5-甲基-1H-苯并咪唑-2-基）-4-溴/硝基酚;溶剂效应;动力学;状态;

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机译：2-（5-甲基-1H-苯并咪唑-2-基）-4-溴/硝基酚及其与锌（II）离子的配合物的合成，光谱表征及溶剂对配合的影响
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Synthesis, spectral characterisation of 2-(5-methyl-1H-benzimidazol-2-yl)-4-bromoitro-phenols and their complexes with zinc(II) ion, and solvent effect on complexation

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