Electrochemical investigations of several transition metal tris(acetylacetonate) complexes
1985; Elsevier BV; Volume: 102; Issue: 2 Linguagem: Inglês
10.1016/s0020-1693(00)86761-4
ISSN1873-3255
AutoresJoanne H. Tocher, John P. Fackler,
Tópico(s)Advanced battery technologies research
ResumoThe voltammetry of a number of M(acac)3 complexes (M = Fe, Ru, Co, Rh or Ir: acac− = acetylacetonate) have been studied. A variety of electrochemical behavior has been found. When M = Fe or Ru, a reversible reduction was found, E12 = −0.61 and −0.70 V respectively. M = Co showed a highly irreversible reduction at E912 = 1.10 V. All complexes undergo oxidation, the potential and character depending on the metal centre. With M = Fe, Co or Rh, the oxidation is irreversible (Epa = +1.70, +1.70, +1.74 V respectively). When M = Ru or Ir, both show a reversible oxidation (E912 = +1.05 and +1.29 V respectively) which, although showing no tendency to undergo any following reactions on the voltammetric time-scale, proved not to be sufficiently stable over the longer time period required for electrosynthesis. Both oxidized species show a reaction with DMF. Preliminary kinetic studies showed the reaction not to be a simple second order process. The general trend in redox potentials and the varying chemical stability of the electrochemically produced cations were in keeping with the higher oxidation state becoming more favorable down the triad.
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