Electrochemical behavior of polymeric complexes of monosubstituted squarate ligands. Part 2. Determination of redox species of manganese(II) complexes in the donor solvents, dimethylformamide and dimethylsulfoxide |
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Authors: | Emmanuel IwuohaAvril Rae Williams-Dottin Lincoln A Hall |
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Affiliation: | Department of Chemistry, The University of the West Indies, St. Augustine, W.I., Trinidad and Tobago |
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Abstract: | Cyclic and square wave voltammetry (−1500 to 1500 mV) of {Mn[μ-(C6H5)2NC4O3]2[H2O]4}n [manganese(II) diphenylaminosquarate] (1) and [Mn(μ-C6H5C4O3)(C6H5C4O3)(H2O)3]n [manganese(II) phenylsquarate] (2) at a gold disk electrode in dimethylsulfoxide (DMSO) and dimethylformamide (DMF), reveal several couples attributable to both ligand and metal-based redox processes. For the manganese(II) phenylsquarate in DMF, the metal-based peaks are more numerous and readily discernible than in DMSO. In either of the solvents, the ligand-based peaks always occur at more positive or more negative potentials than the metal-based ones. In 1 and 2, Mn(II)/Mn(0), Mn(III)/Mn(II), Mn(IV)/Mn(III) and Mn(V)/Mn(IV) couples are observed. However, the manganese redox peaks appear at more negative potentials in 1. |
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Keywords: | Electrochemistry Manganese(II) complexes Monosubstituted squarate complexes DMF, DMSO |
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