title: Photoinduced intermolecular electron transfer from dimethyl aniline to 7-amino coumarin dyes in the surface of beta-cyclodextrin.
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 beta-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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India.
authors.forename: Anjan
authors.initials: A
authors.lastname: Chakraborty
authors.forename: Debabrata
authors.initials: D
authors.lastname: Seth
authors.forename: Debdeep
authors.initials: D
authors.lastname: Chakrabarty
authors.forename: Nilmoni
authors.initials: N
authors.lastname: Sarkar
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D003374:Coumarins / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D004396:Coloring Agents; D003374:Coumarins; D047392:beta-Cyclodextrins; C080488:7-aminocoumarin; C031215:betadex