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Electrochemistry and spectroelectrochemistry of oxo- and peroxomolybdenum porphyrin complexes

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic00238a028· OSTI ID:5108208
The electrochemistry of various oxomolybdenum(IV), -(V), and -(VI) porphyrins is reported in nonaqueous media. The investigated complexes include OMo(TPP), OMo(TPP)(X), O/sub 2/Mo(TPP), and (O/sub 2/)/sub 2/Mo(TmTP), where X = ClO/sub 4//sup -/, OCH/sub 3//sup -/, or OH/sup -/ and where TPP and TmTP are the dianions of tetraphenylporphyrin and tetra-m-tolylporphyrin, respectively. An exact sequence of the individual electron-transfer steps composing the overall redox process of each complex is described, and a comparison between the electrochemistry of the different types of complexes is discussed. Each electrode reaction was monitored by spectroelectrochemistry and by ESR spectroscopy, and on the basis of the electrochemical and spectroscopic data, a self-consistent oxidation-reduction mechanism is presented. The potential for the Mo(V)/Mo(IV) reaction of OMo(TPP)(X) is strongly influenced by the axial ligand X and varies from 0.02 V for X = ClO/sub 4//sup -/ to -0.87 V for X = OCH/sub 3//sup -/. OMo(TPP)(X) is produced by the one-electron oxidation and coupled oxygen atom transfer of O/sub 2/Mo(TPP) while OMo(TPP) is generated as the final product in the electroreduction of O/sub 2/Mo(TPP).
Research Organization:
Univ. of Houston, University Park, TX
OSTI ID:
5108208
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 25:18; ISSN INOCA
Country of Publication:
United States
Language:
English