Abstract
AbstractThis work presents two mixed‐valent μ3‐oxo‐bridged trinuclear [(Co2+)2Co3+] complexes 1 and 2 and a μ4‐oxo‐bridged tetranuclear [Co2+4] complex 3. Crystal structures of 1 and 2 showed the presence of triangular complexes having two Co2+ and one Co3+ centers bridged by a μ3‐oxo group. In contrast, complex 3 exhibited a tetrahedrally arranged μ4‐oxo‐bridged [Co2+4] core. A significant feature is the stabilization of unusual μ‐oxo‐bridged complexes exclusively supported with all nitrogen donor ligands. The X‐ray photoelectron spectroscopy confirmed the multiple oxidation states of cobalt ions in these complexes. Such oxo‐bridged cobalt complexes were investigated for their catalytic activity towards H2O2‐mediated oxidation of assorted benzyl alcohols.
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