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Photoinduced intermolecular electron transfer from dimethyl aniline to 7-amino Coumarin dyes in the surface of β-cyclodextrin

Authors
Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
1386-1425
Publisher
Elsevier
Publication Date
Volume
64
Issue
3
Identifiers
DOI: 10.1016/j.saa.2005.08.007
Keywords
  • Electron Transfer
  • Steady-State Quenching
  • Time-Resolved Quenching
  • Free Energy

Abstract

Abstract The photoinduced electron-transfer reaction between Coumarin dyes and N, N-dimethylaniline has been investigated using steady-state and Time-resolved fluorescence spectroscopy in the surface of β-cyclodextrin in dimethyl formamide (DMF) solvent. The electron-transfer rate constant has been correlated with the free-energy change during the process. We have observed a diffusion-controlled ET process in pure DMF by showing a normal Marcus region. However, the picture is different in presence of cyclodextrin. Here the ET is retarded at higher free-energy region. This unusual feature in bimolecular electron-transfer reaction is assumed to be arising from the different binding possibility of the Coumarin molecules to the cyclodextrin moity.

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