The use of antenna-sensitizer molecular devices is proposed as a possible strategy to increase the light harvesting efficiency of sensitized semiconductors. To illustrate this approach, the cyano-bridged trinuclear complex [ Ru(bpy)2 (CN)2]2Ru(bpy(COO)2)2- has been synthesized and studied. The complex adsorbs on TiO2 via the negativity charged -Ru(bpy(COO)2)2- central unit. The photophysical behavior in solution and the photoelectrochemical behavior on TiO2 have been studied. Emission and excitation spectra show that in this complex the light energy absorbed by the terminal Ru(bpy)2(CN)2 (antenna) groups is efficiently funneled to the central -Ru(bpy(COO)2)2- (sensitizer) fragment. Photochemical spectra on TiO2 demonstrate that the light absorbed by the antenna fragments is efficiently used for sensitization of the semiconductor.
DESIGN OF ANTENNA-SENSITIZER POLYNUCLEAR COMPLEXES - SENSITIZATION OF TITANIUM-DIOXIDE WITH [RU(BPY)2(CN)2]2RU(BPY(COO)2)22-
AMADELLI, Rossano;ARGAZZI, Roberto;BIGNOZZI, Carlo Alberto;SCANDOLA, Franco
1990
Abstract
The use of antenna-sensitizer molecular devices is proposed as a possible strategy to increase the light harvesting efficiency of sensitized semiconductors. To illustrate this approach, the cyano-bridged trinuclear complex [ Ru(bpy)2 (CN)2]2Ru(bpy(COO)2)2- has been synthesized and studied. The complex adsorbs on TiO2 via the negativity charged -Ru(bpy(COO)2)2- central unit. The photophysical behavior in solution and the photoelectrochemical behavior on TiO2 have been studied. Emission and excitation spectra show that in this complex the light energy absorbed by the terminal Ru(bpy)2(CN)2 (antenna) groups is efficiently funneled to the central -Ru(bpy(COO)2)2- (sensitizer) fragment. Photochemical spectra on TiO2 demonstrate that the light absorbed by the antenna fragments is efficiently used for sensitization of the semiconductor.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
