In polychromophoric complexes of the type: [NC-Ru(L)2-CN-Ru(L')2-CN]+, [NC-Ru(L)2-CN-Ru(L")2-NC-Ru(L)2]2+ (L = 2,2'bipyridine, L' = 2,2' bipyridine or 1-10 phenantroline, L" = 2,2' bipyridine or 4,4'dicarboxy-2,2'bipyridine) photoinduced energy transfer from C- to N- bonded Ru-units takes place. Photocurrent spectra on TiO2 obtained with the trinuclear [NC-Ru(bpy)2-CN-Ru(bpy(COOH)2)2-NC-Ru(bpy)2-CN]2+ complex suggest that the light energy absorbed by the external moieties is efficiently funneled to the central fragment and used for the sensitization of the semiconductor. Towards the building of more extended antenna units, polychromophoric Re-Ru complexes of general formula: [(phen)(CO)3Re-CN-[Ru(bpy)2- CN]n-Ru(bpy)2-CN](n+1) (n = 0-3) have been synthesized and studied.
PHOTOINDUCED INTRAMOLECULAR ENERGY-TRANSFER PROCESSES IN POLYNUCLEAR RUTHENIUM(II) POLYPYRIDINE COMPLEXES - DESIGN OF LONG-CHAIN CYANOBRIDGED POLYNUCLEAR SPECIES FEATURING VECTORIAL ENERGY-TRANSFER
BIGNOZZI, Carlo Alberto;ARGAZZI, Roberto;CHIORBOLI, Claudio;SCANDOLA, Franco
1991
Abstract
In polychromophoric complexes of the type: [NC-Ru(L)2-CN-Ru(L')2-CN]+, [NC-Ru(L)2-CN-Ru(L")2-NC-Ru(L)2]2+ (L = 2,2'bipyridine, L' = 2,2' bipyridine or 1-10 phenantroline, L" = 2,2' bipyridine or 4,4'dicarboxy-2,2'bipyridine) photoinduced energy transfer from C- to N- bonded Ru-units takes place. Photocurrent spectra on TiO2 obtained with the trinuclear [NC-Ru(bpy)2-CN-Ru(bpy(COOH)2)2-NC-Ru(bpy)2-CN]2+ complex suggest that the light energy absorbed by the external moieties is efficiently funneled to the central fragment and used for the sensitization of the semiconductor. Towards the building of more extended antenna units, polychromophoric Re-Ru complexes of general formula: [(phen)(CO)3Re-CN-[Ru(bpy)2- CN]n-Ru(bpy)2-CN](n+1) (n = 0-3) have been synthesized and studied.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
