Abstract
A group of three high-spin manganese(II) bis-chelates were synthesized using tridentate 2,6-bis(pyrazol-l-ylmethyl)pyridine and its methyl substituted derivatives. The complexes were isolated as crystalline diperchlorate salts. Two five-coordinate mono-chelates with two chlorides as co-ligands were also synthesized. All the complexes were characterized using conventional physico-chemical techniques. Nucleophilic halide displacement reactions in water on the dichloro complexes afforded aqua complexes. When examined by cyclic voltammetry each complex displays an irreversible Mn III/Mn II couple. The trends in the anodic peak potentials are rationalized on the basis of electronic/steric effects of the methyl groups present near the donor site.
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