METAL-METAL CHARGE-TRANSFER INTERACTION AND PHOTOREACTIVITY OF ((C5H5)(2)TI-IV[MU-NCRUII(CN)(5)](2))(6-)

The trinuclear compound NMe(3)Cet)(6){(C5H5)(2)Ti-IV[mu-NCRuII(CN)(5)] (2)} (Cet=cetyl) was prepared and characterized. In CHCl3 it shows an intense long-wavelength absorption at lambda(max)=630 nm which is assi gned to a Ru(II) to Ti(IV) MMCT transition. The corresponding anions { (C5H5)(2)M(IV)[mu-NCRuII(CN)(5)](2))(6-) with M=Zr and Hf could not be isolated owing to their facile decomposition. They display MMCT absor ptions at lambda(max)=420 nm (Zr) and 365 nm (Hf). The complex ((C5H5) (2)Ti-IV[mu-NCRuII(CN)(5)](2)}(6-) underwent a photoredox reaction upo n MMCT excitation with phi=0.03 at lambda(irr)=577 nm.