A photosensitizer dinuclear ruthenium complex: intramolecular energy transfer to a covalently linked fullerene acceptor

Chemistry. 2001 Apr 17;7(8):1597-605. doi: 10.1002/1521-3765(20010417)7:8<1597::aid-chem15970>3.0.co;2-#.

Abstract

A fullerene derivative (5) in which a dinuclear ruthenium complex is covalently linked to a fulleropyrrolidine (FP) through a rigid spacer has been prepared through azomethine ylide cycloaddition to C60. Electrochemical and photophysical studies revealed that ground-state electronic interactions between the bimetallic ruthenium chromophore and the FP moiety are small. The absorption spectrum of 5 displays a metal-to-ligand charge transfer (MLCT) transition at about 620 nm in CH2Cl2 which is shifted by nearly 160 nm relative to that of a previously reported mononuclear dyad (8). The photophysical investigations have also shown that both in dichloromethane and acetonitrile the photoexcited MLCT state of dyad 5 transforms into the fullerene triplet excited state with a quantum yield of 0.19 and that, contrary to mononuclear dyad 8, electron transfer, if any under the applied conditions, is negligible relative to energy transfer.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Carbon
  • Electrochemistry
  • Energy Transfer*
  • Fullerenes*
  • Metalloporphyrins / chemistry*
  • Molecular Structure
  • Oxygen / chemistry
  • Photolysis
  • Photosensitizing Agents / chemistry*
  • Ruthenium / chemistry*
  • Singlet Oxygen
  • Spectrophotometry, Atomic
  • Spectrophotometry, Ultraviolet

Substances

  • Fullerenes
  • Metalloporphyrins
  • Photosensitizing Agents
  • Singlet Oxygen
  • Carbon
  • Ruthenium
  • fullerene C60
  • Oxygen