Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

 Regional Subscription Agents/Distributors
Trends in Photochemistry & Photobiology   Volumes    Volume 6 
Photoexcited triplet states of organic molecules in ionic forms
Mikio Yagi, Satoru Yamaguchi
Pages: 99 - 112
Number of pages: 14
Trends in Photochemistry & Photobiology
Volume 6 

Copyright © 1999 Research Trends. All rights reserved


The electron paramagnetic resonance (EPR) studies on the acid-base equilibria of organic molecules in the lowest excited triplet (T1) states are reviewed. The combined method of the time-resolved EPR technique and the stretched poly(vinyl alcohol)-film technique is useful for studying the acid-base equilibria of short-lived and very weakly phosphorescent T1 molecules, where the steady-state EPR and optically detected magnetic resonance techniques are not applicable. By applying a microwave magnetic field parallel to an external magnetic field, the proton hyperfine structures in ΔMs = ±2 transitions have been observed for the T1 states of organic molecules in glassy matrices at 77 K. The parallel-polarized EPR method is useful for studying the anisotropic hyperfine structures of molecules under acid-base equilibria, where a single-crystal method is not applicable. The effects of protonation and deprotonation on the spin densities, zero-field splittings and anisotropic S1 → T1 intersystem crossing rates for the three T1 sublevels are discussed.

Buy this Article


Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Search Products
Browse in Alphabetical Order : Journals
Browse by Subject Classification : Journals

Ordering Information Ordering Information
Downloadable forms Downloadable Forms