摘要
以一个新型的双希夫碱五齿配体N,N'-二-[(苯并咪唑)亚乙基]二乙撑三胺(LA)分别和Zn Cl2和Cd Cl2反应,得到了两个过渡族配合物.在Zn(Ⅱ)配合物中,五齿配体发生了水解,变成一个单希夫碱配体,配位中心呈现一个五配位的配位模式.而Cd(Ⅱ)配合物中的配体却是完整的,配位中心呈现一个六配位的配位模式.结果表明金属中心对配位模式和配体的水解有较大的影响.晶体结构分析表明:两个配合物中心的过渡金属离子与LA或LB的多齿配体螯合,端基的卤素离子协同参与配位,配位中心分别表现出三角双锥和八面体的配位构型.苯并咪唑上未参与配位的N—H基团和水分子产生了大量的氢键作用,最终形成了三维的堆积结构.
The reactions of Zn Cl2 and Cd Cl2·2. 5H2 O with di-Schiff base ligand of N,N’-bis-[( 1-benzimidazo-2-yl) ethylidene]diethylenetriamine( LA) were investigated in presence of Na Cl O4 in ethanol. The five-coordinated complex of [Zn LBCl ]· Cl O4( 1) and the six-coordinated complex of[Cd LACl]·Cl O4·H2O( 2) were prepared by the reactions of LAwith Zn Cl2. LBof N-[( 1-benzimidazo-2-yl) ethylidene]diethylenetriamine was a tetra-dentate mono-Schiff base ligand prepared by the hydrolysis of the precursor di-Schiff base ligand of LA. X-ray diffraction analysis reveals that the transition atoms in two complexes are chelated by different multidentate ligands of LAand LBwith terminal chloride atom to exhibit slightly distorted trigonalbipyramid and octahedron coordination sphere,respectively. The noncoordinating N—H groups of benzimidazoyl and the lattice water form strong hydrogen bonding interactions with the counter anions to lead to great difference of crystal packing.
出处
《江苏大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2016年第3期337-341,366,共6页
Journal of Jiangsu University:Natural Science Edition
基金
国家自然科学基金资助项目(21171075)
关键词
苯并咪唑
双希夫碱配体
五齿配体
晶体结构
氢键作用
benzimidazole
di-Schiff base ligand
pentadentate ligand
crystal structure
hydrogen bonding