Photoelectrodes based on electropolymerized molecular ruthenium and osmium diads
作者:Jean Paul Collin、Alain Deronzier、Mohamed Essakalli
DOI:10.1021/j100168a036
日期:1991.7
Ruthenium(II) and osmium(II) complexes with modified terpy ligands (terpy = 2,2':6',2"-terpyridine) have been prepared. The systems consist of two different ligands bonded to the metal center, one bearing an electron acceptor (viologen) and the other being end-linked to a pyrrole ring via its N atom. Electropolymerization of the ruthenium compound affords an electrically conductive film on the surface of a platinum electrode. The polypyrrole backbone is linked to pendent groups containing a photoactive component (ruthenium complex core) and an electron acceptor subunit (viologen). The modified electrode thus obtained acts as a photoelectrode. Visible light irradiation of the material in the presence of an organic electron donor (triethanolamine) in CH3CN leads to a significant photocurrent when the electrode is potentiostated at 0 V. The light energy conversion of the present integrated system is much more efficient than for the analogous material prepared by copolymerization of the two separate components, electron acceptor-pyrrole and ruthenium complex-pyrrole.
Ruthenium and osmium complexes of 2,2′ : 6′,2″-terpyridine covalently linked to electron acceptor and electron donor groups
2,2′ : 6′,2″-Terpyridine ligands have been modified so as to bear an electronacceptor or an electrondonorgroup; efficient intramolecular vectorial electron transfer has been shown to occur in an osmiumcomplex from its metal-to-ligand charge transfer excited state.