草酸桥联双核Ni(Ⅱ)配合物的合成、光谱和结构

Synthesis, Spectroscopy and Structures of Oxalato-bridged Bmuclear Nickel (Ⅱ) Complexes

合成并表征了两个含有不同阴离子的双核镍(Ⅱ)配合物{[(tacn)Ni(H_2O)]_2(μ-C_2O_4)}I_2·2H_2O(1)和{[(tacn)Ni(H_2O)]_2(μ-C_2O_4)}(ClO_4)_2·2H_2O(2)(tacn=1,4,7-三氮杂环壬烷).晶体结构分析表明这两个配合物中,两个Ni离子通过草酸根桥联,每个Ni离子还与一个大环配体tacn上的三个氮原子和一个水分子配位形成变形八面体结构.结晶水和配位水之间通过氢键相连.在紫外-可见区测定了配合物的固体反射谱和溶液吸收谱.

Two binuclear nickel(Ⅱ) complexes of formula {[ (tacn)Ni(H2O) ]2(μ - C2O4)} I2·2H2O (1) and {[(tacn)Ni(H2O)]2(μ - C2O4)} (ClO4)2·2H2O (2), where tacn = 1,4,7 - triazacyclononane, have been synthesized. The crystal structures show that nickel (Ⅱ) ions are bridged by oxalate and each nickel (Ⅱ) coordinates with three nitrogen atoms of tacn and one water molecule to form octahedron. The hydrogen bonds were observed between coordinated water and lattice water molecules. The solid reflection spectra and solution absorption spectra of 1 and 2 have been measured.