Consequences of electronic/steric effects on monochelate and bischelate manganese(II) (S =5/2 ) complexes using pyridinylpyrazole ligands. Synthesis and electrochemistry

Mahapatra, Samiran ; Bhuniya, Debnath ; Mukherjee, Rabindra Nath (1992) Consequences of electronic/steric effects on monochelate and bischelate manganese(II) (S =5/2 ) complexes using pyridinylpyrazole ligands. Synthesis and electrochemistry Polyhedron, 11 (16). pp. 2045-2049. ISSN 0277-5387

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...

Related URL: http://dx.doi.org/10.1016/S0277-5387(00)83160-5

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 MnIII/MnII 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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