PHOTOOXIDATION OF [1,2-BIS(DIPHENYLPHOSPHINO)FERROCENE]-PALLADIUM(0) IN CCL4 INDUCED BY FERROCENE TO SOLVENT CHARGE-TRANSFER EXCITATION

The electronic spectrum of Pd-0[(PPh2C5H4)(2)Fe-II](2) in CCl4 shows a n absorption at lambda(max) = 338 nm that is assigned to a charge tran sfer-to-solvent (C-TTS) transition from the ferrocene moiety to CCl4. The CTTS excitation leads to the formation of Pd-II[(PPh2C5H4)(2)Fe-II ]Cl-2. It is suggested that the irradiation induces initially the gene ration of Fe-III, which then oxidizes Pd-0 by intramolecular electron transfer. Product formation takes place by a disproportionation of Pd- I. (C) 1998 Elsevier Science S.A. All rights reserved.