MAGNETOKINETIC PROBING OF EXTREMELY FAST-ELECTRON SPIN RELAXATION IN PARAMAGNETIC RUTHENIUM COMPLEXES

A regularity previously observed in the ligand dependence of the magne tokinetic effect on the photoelectron transfer efficiency between phot oexcited bileptic Ru-trisdiimine complexes and methylviologen has been substantiated by investigating, in addition, the bipyridine/phenanthr oline series of ligands. Our theoretical model of the mechanism has be en improved by taking into account non-rotational mechanisms of spin r elaxation in the photooxidized Ru3+-complex. The field dependences obs erved for the two bileptic series of complexes can be theoretically re produced in a very consistent way. Paramagnetic relaxation times found to range around 10(-11) s, reveal a striking regularity in the course of ligand variation through the bileptic series.