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The pH-dependent electronic and electrochemical properties of a series of triangular μ 3 -oxo-centered trinuclear clusters of the type [Ru 3 O(Ac) 6 (py) 2 (OH x )] n (Ac = acetate; py = pyridine; x = 0, 1, or 2; where the formal oxidation states on the metal ions range from +II to +IV) have been investigated with emphasis on the elucidation of the successive proton-coupled redox processes spanning the interconvertible aqua-(x = 2), hydroxo-(x = 1), and oxo-(x = 0) forms, from which the complete Pourbaix diagram has been proposed. From the spontaneous slow coupling reaction of the monomeric cluster in its

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A new tetraruthenated manganese(III) porphyrin has been obtained and characterized by spectroscopy, electrochemistry, and spectroelectrochemistry. It exhibits a saddle-shaped, nonplanar structure that conveys interesting catalytic, electrocatalytic, and spectroelectrochemical properties to the molecule. Selective steric influence induced by the peripheral ruthenium complexes has been detected in the catalytic oxidation of cyclohexane and cyclohexene with iodosylben-