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• W2078100570 abstract "The use of cyclen (1,4,7,10-tetraazacyclododecane) as a blocking ligand enables assembly of the mixed-valence square complex [(cyclen)4Ru4(pz)4]9+ (pz = pyrazine). A crystal structure determination shows the molecule to possess a regular square geometry wherein each Ru atom has an equivalent coordination environment. Consistent with the presence of one RuIII and three RuII centers, cyclic voltammetry reveals a single reversible reduction wave and three successive oxidation waves. The separation between the first oxidation and reduction waves indicates a comproportionation constant of Kc = 108.9 for the [(cyclen)4Ru6(pz)4]9+ square, suggesting a greater extent of electron delocalization than that observed for the Creutz-Taube ion. The closer spacing between oxidation waves suggests a lesser degree of delocalization in the [(cyclen)4Ru6(pz)4]10+ (Kc = 102.0) and [(cyclen)4Ru6(pz)4]11+ (Kc = 103.0) species, bearing the higher average oxidation states of Ru2.5+ and Ru2.75+, respectively." @default.
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• W2078100570 date "2002-07-11" @default.
• W2078100570 modified "2023-09-27" @default.
• W2078100570 title "[(Cyclen)₄Ru₄(pz)₄]⁹⁺: A Creutz−Taube Square" @default.
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• W2078100570 doi "https://doi.org/10.1021/ja027114q" @default.
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