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Quantum Yields for the Photosensitized Formation of the Lowest Electronically Excited Singlet State of Molecular Oxygen in Solution

By Wilkinson, Francis

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Book Id: WPLBN0000660322
Format Type: PDF eBook
File Size: 13.40 MB.
Reproduction Date: 2005
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Title: Quantum Yields for the Photosensitized Formation of the Lowest Electronically Excited Singlet State of Molecular Oxygen in Solution  
Author: Wilkinson, Francis
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Language: English
Subject: Technology., Reference materials, Technology and literature
Collections: Techonology eBook Collection
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Wilkinson, F. (n.d.). Quantum Yields for the Photosensitized Formation of the Lowest Electronically Excited Singlet State of Molecular Oxygen in Solution. Retrieved from http://hawaiilibrary.net/


Description
Technical Reference Publication

Excerpt
Introduction: Ground state molecular oxygen, O2, is well known to be highly reactive and essential for animal respiration. Its properties have been actively studied for more than 200 years. However the properties of its lowest electronically excited state has only been actively investigated during the last three decades. This is illustrated in the book entitled Singlet Molecular Oxygen1 where Paul Schaap collects 28 Benchmark papers covering the period 1924-1973 which tell the story of the 'discovery' of singlet oxygen and many of the key steps taken towards present day understanding. There is strong evidence for the involvement of single oxygen, in photodynamic inactivation of viruses and cells, in phototherapy for cancer, in photocarcinogenisis, in the photodegradation of dyes and polymers and in the dye sensitization of the photodegradation of polymers. Much current interest in the chemical reactions of singlet oxygen stems from its potential as a photochemo-therapeutic agent.

Table of Contents
Contents 1. Tntrndnctinn.. .............................. 2. Photosensitized Production of Singlet Oxygen in Solution ................................. 2.1. Sensitized Production by Pulsed Radiolysis. . 3. Methods for Studying Kinetics of the Reactions of Singlet Oxygen.. ......................... 3.1. Phosphorescence Decay. ............... 3.2. Time Deyelrderrt Thsr-1na1 Lcrrsirlg dus tu Singlet Oxygen Decay.. ................ 3.3. Time Dependent Acceptor Disappearance . . 3 3.1. Following Pulsed Excitation of a Sensitizer ...................... 3.3.2. Monitoring Sensitized Photooxidation by Consumption of Reactants or Appearance of Products Under Steady-State Conditions ..................... 3.3.3. Separation of k, and k,. ......... 01993 by the U.S. Secretary of Commerce on behalf of the United States. This copyright is assigned to the American Institute of Physics and the American Chemical Society. Reprints available from ACS; see Reprints List at back of issue. 4. Methods for Determining the Sensitized Yields of Singlet Oxygen Production.. .............. 120 4.1. Photo-oxidation Studies.. .............. 121 4.1.1. Steady-State Irradiation. ........ 121 4.1.2. Pulsed Studies of Acceptor Disappearance.. ................ 122 4.2. Photothermal Methods.. ............... 123 4.2.1. Steady-State Photocalorimetric Methods ....................... 123 4.2.2. Time Dependent Thermal Lensing. . 123 4.2.3. Laser Induced Photoacoustics ... 123 4.3. Luminescence Intensity Measurements. . 124 4.4. Triplet Energy Transfer and Singlet Oxygen Yields. ........................ 124 4.4.1. Using Triplet @Carotene as a Probe .......................... 124 4.4.2. Using Luminescence Measurements. 125 4.4.3. Uslng l'ulsed Studies of Acceptor Disappearance. ................. 125 5. Quantum Yields of Singlet Oxygen Production - Commcnts on Tablcs.. ................... 126 5.1. Contents of Tables 1-3 ................ 126 5.2. Relative Measurements and Standard Values ................................ 126

 

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