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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > June  >
Symposium: Applications of Inorganic Photochemistry
Photo-Induced Energy or Electron Transfer in Supramolecular Systems: Applications to Molecular Wires and Light-Harvesting Sensors
Raymond F. Ziessel
Laboratorie de Chimie, d'Electronique et de Photonique Moleculaires, Ecole de Chimie, des Polymeres et des Materiaux de Strasbourg (ECPM), 1, rue Blaise Pascal, 67008 Strasbourg, France
Cover
June 1997
Vol. 74 No. 6
p. 673
Abstract
A synthetic protocol is summarized that provides access to various multi-site ligands (bipyridines, terpyridines...) bridged by alkyne spacer comprising one to four ethynyl subunits. These ditopic ligands have been used to prepare luminescent transition-metal complexes in which long-range electronic coupling between remote units has been observed. Intramolecular triplet energy transfer, photon migration and light-induced electron transfer occur by way of extremely rapid superexchange involving energetic states localized on the bridge. Very long triplet-energy excited-state have been measured in the terpyridine complexes resulting from a selective decoupling of the MLCT triplet state and higher-energy metal-centered (MC) and ligand-centered excited states (LC). The level of electronic communication along the molecular wire can be modulated by insertion of "Pt(PnBu3)2" insulating groups into the bridge. These metallo-insulating groups provide further means to manipulate the stereochemistry around the central subunit and to control the efficiency of triplet energy transfer. A photochemical molecular device consisting of a light conversion process, via an absorption/energy-transfer/emission (A/ET/E) sequence of photochemical events is realized in photoactive lanthanide complexes of calix[4]arenes podands bearing three to four pendant bipyridine arms.
More Information
*  Citation
 Ziessel, Raymond F. J. Chem. Educ. 1997 74 673.
*  Keywords
 Inorganic Chemistry, Materials Science, Photochemistry, Kinetics, Spectroscopy
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
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