二价金属镍磁性配合物的合成、单晶结构及磁性研究.

The synthesis of a novel complex [Ni3 (L3 -)2 (1,4-bib)4 (H2 O)2]·5H2 O (1) with three-dimensional framework structure was achieved through a hydrothermal reaction, employing 5-((4-carboxylphenoxy)-methyl) isophthalic acid (H3 L) 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　χmT in complex 1 can be described by zero field splitting. [ABSTRACT FROM AUTHOR]