The stability of the Ru-3(mu(3)-O) core) core was studied with respect to t
he reaction of Ru-(mu(3)-O) bond rupture in isomeric complexes [Ru-3(mu(3)-
O)(mu-O2CCF3)(6)(H2O)(3)](+) and [Ru-3(mu(3)-O)(mu-O2CCF3)(6)x (H2O)(2)(HO2
CCF3)](+) in their interaction with pyridine.