Isovalent and Mixed-Valent Diruthenium Complexes (acac)2RuII(m-bpytz)RuII(acac)2 and (acac)2RuII(m-bpytz)RuIII(acac)2(ClO4) (acac = Acetylacetonate and bpytz = 3,6-Bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine): Synthesis, Spectroelectrochemical, and EPR Investigation

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Inorganic Chemistry 43 (19): 6108--6113 (2004)
DOI: 10.1021/ic049346r


The title compds. involving the structurally characterized bridging ligand bpytz were characterized, showing very strong electrochem. stabilization of the mixed-valent RuIIRuIII state (Kc = 1013.9) but no detectable (e \textless 20 M-1 cm-1) intervalence charge-transfer band in the IR region. In situ redn. of the neutral precursor produces a diruthenium(II) complex of the bpytz radical anion according to EPR spectroscopy, whereas oxidn. of the mixed-valent form leads to a diruthenium(III) species. on SciFinder(R)



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