PHOTOINDUCED CHARGE SEPARATION IN DYADS AND TRIADS CONTAINING A RUTHENIUM(II)-BIS-TERPYRIDINE OR OSMIUM(II)-BIS-TERPYRIDINE PHOTOSENSITIZER COVALENTLY LINKED TO ELECTRON-DONOR AND ACCEPTOR GROUPS

Some supramolecular systems containing a photosensitizer (P) covalently linked to an electron acceptor (A) and/or an electron donor (D) are reported. The photosensitizer is Ru(ttp)2(2+) or Os(ttp)2(2+), A is MV2+ and D is PTZ or DPAA [ttp is 4'-(p-tolyl)-2,2'-6',2"-terpyridine, MV2+ is methyl viologen, PTZ is phenotiazine, and DPAA is di-p-anisylamine]. The spectroscopic properties and electrochemical behavior of these systems have been investigated. Thermodynamic and kinetic aspects for possible formation of photoinduced charge separated products are discussed.