Synthesis and Structures of Dimeric Zinc Complexes Supported by Unsymmetrical Rigid Bidentate Imino- acenapthenone Ligand

摘要

We report two zinc complexes of molecular formulae ud[ZnClud2ud(Mesud-udBIAO)]ud2ud(ud3ud)udand ud[ZnClud2ud(Dippud-udBIAO)]ud2ud(ud4ud) ( Mes = Mesityl, Dippud= 2,6ud-uddiisopropylphenyl) of rigid unsymmetrical udbidentate iminoacenapthenone ligands (Mesud-udBIAO) (ud1ud) and Dippud-udBIAO) (ud2ud). The zinc complexes ud3udandud4udcan be achieved by the reaction of ZnClud2udand neutral [udNud-ud(mesityl)ud-udiminoacenapthenone] (ud1ud) and [udNud-ud(2,6ud-uddiisopropylphenyl)ud-udiminoacenapthenone] ligand (ud2ud) respectively in dichloromethane at ambient udtemperature. The solid state structures of the complexes ud3udand ud4udwere established by single crystal X ud–udray uddiffraction analysis. In the solid state structures, boudth the complexes are dimeric in nature. In complexes ud3 udandud4ud, each of the zinc coordination polyhedron is formed by the ligation of imine nitrogen, carbonyl udoxygen atoms of the ligand ud1udand ud2udrespectively along with three chlorine atoms. Out these three chudlorine udatoms, two are udud2 udbridged with adjacent zinc atom to form the dimer. Thus overall zinc atom is pentaud-udcoordinated and the geometry can be best described as a distorted trigonal bipyramidal or a distorted udsquare pyramidal.