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