MAGNETIC-PROPERTIES OF SOME TRIANGULAR TRINUCLEAR COMPLEXES OF [RU(2)M(MU-CH3COO)(6)(MU(3)-O)(PY)(3)](N-M() WITH A PARAMAGNETIC ION)

Magnetic susceptibilities and electron paramagnetic resonances (EPRs) of coordination compounds of triangular trinuclear [Ru(2)M(mu-CH3COO)( 6)(mu(3)-O)(py)(3)](n+), M=Mn(II), Fe(III), Cr(III), N(II), or Co(II) ions, were observed. The results were analysed by the spin vector mode l. Effective Bohr magneton numbers showed that the main superexchange interaction within each cluster was of the order of J/k=-300 K. This w as considered to be working through mu(3)-O. Together with some weaker superexchange interactions through mu-CH3COO paths, fittings with the susceptibilities of the model were tried. EPR signals at temperatures of a few K were characteristic of each M ion. M=Mn(II) and M=Fe(II) w ere at high spin states of S=5/2 and M=Co(II) was at a low spin state of S=1/2. Temperature dependences of EPR signals are discussed.