Investigations on the Photoreactions of Phenothiazine and Phenoxazine in Presence of 9-cyanoanthracene by Using Steady State and Time Resolved Spectroscopic Techniques

By using electrochemical, steady state and time resolved (fluorescence lifetime and transient absorption) spectroscopic techniques, detailed investigations were made to reveal the mechanisms of charge separation or forward electron transfer reactions within the electron donor phenothiazine (PTZH) or...

Full description

Saved in:
Bibliographic Details
Published in:Journal of fluorescence 2010-09, Vol.20 (5), p.1061-1068
Main Authors: Bardhan, Munmun, Mandal, Paulami, Tzeng, Wen-Bih, Ganguly, Tapan
Format: Article
Language:English
Subjects:
Absorption
Analytical Chemistry
Anthracenes - chemistry
Biochemistry
Biological and Medical Physics
Biomedical and Life Sciences
Biomedicine
Biophysics
Biotechnology
Charge
Charge transfer
Contact
Electrochemistry
Electron transfer
Electron Transport - radiation effects
Electrons
Fluorescence
Models, Chemical
Molecular Structure
Nitriles - chemistry
Original Paper
Oxazines - chemistry
Oxidation-Reduction
Phenothiazines - chemistry
Photochemical Processes
Photolysis
Spectrometry, Fluorescence
Spectroscopy
Spectrum Analysis - methods
Steady state
Thermodynamics
Time resolved
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:By using electrochemical, steady state and time resolved (fluorescence lifetime and transient absorption) spectroscopic techniques, detailed investigations were made to reveal the mechanisms of charge separation or forward electron transfer reactions within the electron donor phenothiazine (PTZH) or phenoxazine (PXZH) and well known electron acceptor 9-cyanoanthracene (CNA). The transient absorption spectra suggest that the charge separated species formed in the excited singlet state resulted from intermolecular photoinduced electron transfer reactions within the donor PTZH (or PXZH) and CNA acceptor relaxes to the corresponding triplet state. Though alternative mechanisms of via formations of contact neutral radical by H-transfer reaction have been proposed but the observed results obtained from the time resolved measurements indicate that the regeneration of ground state reactants is primarily responsible due to direct recombination of triplet contact ion-pair (CIP) or solvent-separated ion-pair (SSIP).
ISSN:1053-0509
1573-4994
DOI:10.1007/s10895-010-0658-5