Montazerozohori M, Mojahedi Jahromi S, Masoudiasl A, McArdle P
Department of Chemistry, Yasouj University, Yasouj 75918-74831, Iran.
Department of Chemistry, Yasouj University, Yasouj 75918-74831, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Mar 5;138:517-28. doi: 10.1016/j.saa.2014.11.055. Epub 2014 Nov 28.
In this work, synthesis of some new five coordinated zinc halide/pseudo-halide complexes of a N3-tridentate ligand is presented. All complexes were subjected to spectroscopic and physical methods such as FT-IR, UV-visible, (1)H and (13)C NMR spectra, thermal analyses and conductivity measurements for identification. Based on spectral data, the general formula of ZnLX2 (X=Cl(-), Br(-), I(-), SCN(-) and N3(-)) was proposed for the zinc complexes. Zinc complexes have been also prepared in nano-structure sizes under ultrasonic irradiation. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied for confirmation of nano-structure character for the complexes. Among the complexes, zinc azide complex structure was analyzed by X-ray crystallography. This complex crystallizes as a triplet in trigonal system with space group of P31. The coordination sphere around the zinc center is well shown as a distorted trigonal bipyramidal with three nitrogen atoms from Schiff base ligand and two terminal azide nitrogen atoms attached to zinc ion. Various intermolecular interactions such as NH⋯N, CH⋯N and CH⋯π hydrogen bonding interactions stabilize crystalline lattice so that they causes a three dimensional supramolecular structure for the complex. In vitro screening of the compounds for their antimicrobial activities showed that ZnLI2, ZnL(N3)2, ZnLCl2 and ZnL(NCS)2 were found as the most effective compound against bacteria of Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli respectively. Also ZnLI2 and ZnLCl2 complexes were found more effective against two selected fungi than others. Finally, thermal behaviors of the zinc complexes showed that they are decomposed via 2-4 thermal steps from room temperature up to 1000°C.
在本工作中，展示了一种N3-三齿配体的一些新型五配位卤化锌/拟卤化物配合物的合成。所有配合物均采用光谱和物理方法进行鉴定，如傅里叶变换红外光谱（FT-IR）、紫外可见光谱、（1）H和（13）C核磁共振谱、热分析和电导率测量。基于光谱数据，提出了锌配合物的通式ZnLX2（X = Cl(-)、Br(-)、I(-)、SCN(-)和N3(-)）。锌配合物也在超声辐照下制备成纳米结构尺寸。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）来确认配合物的纳米结构特征。在这些配合物中，通过X射线晶体学分析了叠氮化锌配合物的结构。该配合物以三重态结晶于三方晶系，空间群为P31。锌中心周围的配位球很好地显示为扭曲的三角双锥，其中三个氮原子来自席夫碱配体，两个末端叠氮氮原子与锌离子相连。各种分子间相互作用，如NH⋯N、CH⋯N和CH⋯π氢键相互作用稳定了晶格，从而为该配合物形成了三维超分子结构。对这些化合物的抗菌活性进行体外筛选表明，ZnLI2、ZnL(N3)2、ZnLCl2和ZnL(NCS)2分别是对枯草芽孢杆菌、金黄色葡萄球菌、铜绿假单胞菌和大肠杆菌最有效的化合物。此外，发现ZnLI2和ZnLCl2配合物对两种选定的真菌比其他配合物更有效。最后，锌配合物的热行为表明，它们从室温到1000°C通过2 - 4个热步骤分解。
