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  • TITLE
  • DEDICATION
  • STATEMENT
  • CERTIFICATE
  • ACKNOWLEDGEMENT
  • CONTENTS
  • PREFACE
  • 1. PHOTO INDUCED ELECTRON TRANSFER: AN OVERVIEW
  • 1. Introduction
  • 1.1. Theories of photoinduced electron transfer
  • 1.1.1. Energetic
  • 1.1.2. Rate expressions
  • 1.1.3. Marcus theory
  • 1.1.4. The inverted region
  • 1.1.5. Nonclassical theories
  • 1.2. Circumventing back electron transfer
  • 1.2.1. Electron spin
  • 1.2.2. Electron tunneling
  • 1.2.3. Reactant pair escape and geminate recombination
  • 1.2.4. Orbital symmetry and orientation
  • 1.2.5. Relays
  • 1.2.6. Coulomb effects
  • 1.2.7. Repulsive collisions
  • 1.2.8. Inhibition of back electron transfer by fragmentation
  • 1.2.9. Use of interfaces
  • 1.3. Design and study of new sensitizers to control back electron transfer
  • 1.4. References
  • 2. PHOTOPHYSICAL AND ELECTRON TRANSFER STUDIES OF A FEW 2, 6-DIMETHYL 4- (ALKYLPHENYL) PYRYLIUM AND THIOPYRYLIUM DERIVATIVES
  • 2.1. Abstract
  • 2.2. Introduction
  • 2.3. Results and Discussion
  • 2.3.1. 2, 6-dimethyl-4-alkylphenylpyrylium salts
  • 2.3.1.1. Absorption spectra
  • 2.3.1.2. Fluorescence properties
  • 2.3.1.3. Phosphorescence spectra
  • 2.3.1.4. Laser flash photolysis studies
  • 2.3.1.5. Electron transfer studies
  • 2.3.1.5.1. Fluorescence quenching studies
  • 2.3.1.5.2. Electrochemical studies
  • 2.3.1.5.3. Laser flash photolysis studies
  • 2.3.2. Thiopyrylium derivatives
  • 2.3.2.1. Absorption spectra
  • 2.3.2.2. Emission properties
  • 2.3.2.3. Laser flash photolysis studies
  • 2.3.2.4. Electron transfer studies
  • 2.4. Experimental
  • 2.5. References
  • 3. PHOTOPHYSICAL AND ELECTRON TRANSFER PROPERTIES OF A FEW 2, 6-DI ALKYL-4-ARYLPYRYLIUM SALTS AND DICATIONIC PYRYLIUM SALTS
  • 3.1. Abstract
  • 3.2. Introduction
  • 3.3. Results and Discussion
  • 3.3.1. Photophysical and electron transfer properties of 2, 6-dimethyl-4-arylpyrylium salts
  • 3.3.1.1. Absorption spectra
  • Fig. 3.4. HOMO and LUMO surfaces of 2 and 3 obtained by AMI
  • 3.3.1.2. Fluorescence properties
  • 3.3.1.3. Laser flash photolysis studies
  • 3.3.1.4. Electron transfer studies
  • 3.3.1.4.1. Fluorescence quenching studies
  • 3.3.1.4.2. Laser flash photolysis studies
  • 3.3.2. Photophysical and electron transfer studies of 2, 6-dimethyl-4- (p-acetylphenyl) pyrylium perchlorate
  • 3.3.2.1. Photophysical properties
  • 3.3.2.2. Electron transfer studies
  • 3.3.3. Electron transfer studies of 2, 6-di-tert-butyl-4 phenylpyrylium perchlorate
  • 3.3.4. photophysical and electron transfer studies of dicationic pyrylium salts
  • 3.3.4.1. Absorption and emission studies
  • 3.3.4.2. Laser flash photolysis studies
  • 3.3.4.3. Electron transfer studies
  • 3.4. Experimental
  • 3.5. References
  • 4. PHOTOPHYSICAL AND ELECTRON TRANSFER STUDIES OF SELECTED PYRYLIUM DERIVATIVES IN THE PRESENCE OF β-CYCLODEXTRIN
  • 4.1. Abstract
  • 4.2. Introduction
  • 4.3. Results and Discussion
  • 4.3.1. Absorption spectra
  • 4.3.2. Fluorescence properties
  • 4.3.3. Laser flash photolysis studies
  • 4.3.4. Electron transfer studies
  • 4.4. Experimental
  • 4.5. References