二价金属镍磁性配合物的合成、单晶结构及磁性研究OA北大核心CSTPCD

The synthesis of a novel complex[Ni3(L3-)2(1,4-bib)4(H2O)2]·5H2O(1)with three-dimensional framework structure was achieved through a hydrothermal reaction,employing 5-((4-carboxylphenoxy)-methyl)isophthalic acid(H3L)as the main oxygen-containing ligand,complemented by the N-donor ligand 1,4-bis(1H-imidazol-1-yl)benzene(1,4-bib),and Ni(Ⅱ)ions.The structure of complex 1 was characterized by single crystal X-ray diffraction,powder X-ray diffraction,and elemental analysis.Complex 1 is crystallized in the triclinic crystal system of P-1 space group,and its crystallographic parameters are a=1.260 5(7)nm,b=1.349 1(7)nm,c=1.364 8(7)nm,α=111.913(8)°,β=117.251(7)°,γ=90.732(8)°,V=1.866 2(18)nm3,Z=1,Mr=1 769.66,F(000)=916,μ=0.84 mm-1,Dc=1.575 mg·m-3,S=1.06,R1=0.056,wR2=0.159.The joint contribution of semi-rigid tricarboxylic acid ligand L3-,rigid 1,4-bib and also with Ni(Ⅱ)ion to form a predictable high-dimensional structure.Complex 1 is a three-dimensional network constructed through the coordination of N and O atoms with Ni ion and the structural extension of the ligand.In addition,the magnetic properties of Ni(Ⅱ)compound containing single d electron center were studied:the carboxyl group in mononuclear complex 1 only binds to one cation,resulting in magnetism in the solid being determined by the behavior of single metal ions.Variable temperature magnetic susceptibility of xmT in complex 1 can be described by zero field splitting.