Journal of the Chemical Society, Dalton Transactions p. 2917 - 2920 (1991)
Update date:2022-08-03
Topics:
Ramesh, Krishnamoorthi
Bhuniya, Debnath
Mukherjee, Rabindranath
Complexes of high-spin manganese(III) (μeff = 4.79-5.30 at 298 K) with a closely related group of sexidentate Schiff-base ligands have been prepared and their solution properties thoroughly investigated.The brown to green crystalline complexes display ligand-to-metal charge-transfer transitions in the range 330-400 nm in addition to a crystal-field transition in the range 560-600 nm.The solution stereochemistry has been determined by paramagnetically shifted 1H NMR spectroscopy.Unlike the C3 symmetry in the solid-state structure, in solution the MnIIIN3O3 co-ordination sphere is severely distorted (ca.C1 symmetry).Cyclic voltammetric studies in dimethylformamide solution reveal an irreversible MnIII-MnII couple a quasi-reversible MnIV-MnIII couple (Ef in the range +0.42 to +0.86 V vs.SCE).
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