575490-49-2Relevant academic research and scientific papers
Synthesis, crystal structure and properties of the zinc complexes with unsymmetrical tridentate ligands
Liu, Xueting,Xie, Yongshu,Liu, Qingliang,Du, Chenxia,Zhu, Yu,Xu, Xiaolong
, p. 235 - 243 (2003)
Two complexes of zinc (II) with mixed-ligand, [Zn2(phen)2(HL1)2] (ClO4)2 (1) and [Zn2(phen)2(HL2)2] (ClO4)2 (2) (H2L1=N-(2-hydroxybenzyl) ethanolamine and H2L2 = N-(2-hydroxybenzyl) propanolamine), and another zinc complex ZnL1 (3) were synthesized and characterized by elemental analysis, IR spectra, thermal analysis, fluorescence and 1H NMR. The crystal structure of (1) has a centrosymmetric di-phenoxo-bridged dizinc (II) core and each zinc center is laid in a slightly distorted trigonal bipyramidal geometry. A 2D supramolecular structure is formed approximately along bc plane in terms of the action of multiple N-H?O and O-H?O hydrogen bonds between the (HL1)- ligands and the π?π stacking interactions between the phenanthroline ligands. Thermal behavior, studied by TG and DTA in nitrogen atmosphere, indicates that phen is eliminated at higher temperature than (HL1)- and (HL2)-. Several possible mechanisms for the fluorescence quenching of the metal complexes are proposed.
