Radiation reduction of binuclear Rh(II) complexes in aqueous-methanol solutions

Abstract

Radiation reduction of binuclear [Rh2(OAc)2(phen)2(H2O)2](OAc)2, [Rh2(OAc)(tpy)2Cl2]Cl·2H2O and [Rh2Cl2(HCOO)2(bpy)2]·4H2O complexes in aqueous-methanol solution have been studied. The reduction yields as equal to ca. 6 equiv/100eV and the rate constants of reactions: complex+e solv − as equal to 2.9·1010, 3.2·1010 and 3.7·1010 M−1·s−1, respectively, have been determined. On the basis of electronic spectra it has been shown that Rh(II) compounds were reduced giving several Rh(I) complexes being in equilibrium. The mechanism of the processes has been discussed.