Transition Metal Complexes with Sulfur Ligands. Part CXLIV:Square Planar Nickel Complexes with NiS_4 Cores in Three Different Oxidation States:Synthesis, X-Ray Structural and Spectroscopic Studies

摘要

Complexes [Ni(S_2C_6H_2Bu_2~t)_2]~n were synthesized and characterized in three different oxidation states: n = 2-, 1-, 0. All three members of this redox series were characterized structurally by X-ray diffraction and spectroscopically using NMR, EPR, UV-Vis absorption, and XPS. Their chemical reactivity toward H~+ and CO was also tested. All the results obtained indicate that the changes in the complex oxidation state concern a molecular orbital that is delocalized over the NiS_4 skelet, the ligand benzene rings being virtually unaffected.