MAGNETIC AND SPECTRAL PROPERTIES OF HETEROTRINUCLEAR ACETATES [RU2CO(MU-3-O)(MU-CH3CO2)6(PY)3]N+ (N=0 OR 1)

The preparation and physical properties of the new heterotrinuclear acetates, [Ru2Co(mu3-O)(mu-CH3CO2)6(Py)3] (Ru2Co(II)) and [Ru2Co(mu3-O)(mu-CH3CO2)6(Py)3]I3 (Ru2Co(III), Py = pyridine), are reported. Three reversible one-electron-redox waves are observed at 1.19, 0.40, and -1.24 V vs Ag/Ag+ electrode for Ru2Co(II) in CH2Cl2. The complexes of Ru2Co(II) and Ru2CO(III) show an intense visible absorption at 570 (epsilon 5950 M-1 cm-1) and 551 nm (epsilon 7240 M-1 cm-1), respectively. The magnetic susceptibilities of both complexes were also measured from 4.2 to 300 K. The resulting least-squares fit parameters for Ru2Co(II) are J(RuCo) = -9 cm-1, J(RuRu) = -22 cm-1, g(Co) = g(Ru) = 2.19.