Stabilization of biochemically interesting intermediates by metal coordination. Part 5.—Complexes of ZnII, CuI, ReI and RuII with singly reduced 2,5-diacetylpyrazine

Abstract

Homobinuclear chelate complexes of the 2,5-diacetylpyrazine anion radical with the d¹⁰ and d⁶ metal fragments Zn²⁺, [(PPh₃)₂Cu]⁺, (OC)₃ClRe and [(bpy)₂Ru]²⁺ have been studied by ESR and cyclic voltammetry. The radical state of this centrosymmetric ligand with two biochemically relevant α-carbonylpyrazine chelate sites is considerably stabilized by coordination.