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Triplet-Triplet Absorption Spectra of Organic Molecules

By Carmichael, Ian

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Book Id: WPLBN0000659584
Format Type: PDF eBook
File Size: 21.33 MB.
Reproduction Date: 2005
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Title: Triplet-Triplet Absorption Spectra of Organic Molecules  
Author: Carmichael, Ian
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Language: English
Subject: Technology., Reference materials, Technology and literature
Collections: Techonology eBook Collection
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Carmichael, I. (n.d.). Triplet-Triplet Absorption Spectra of Organic Molecules. Retrieved from http://hawaiilibrary.net/


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Technical Reference Publication

Excerpt
Introduction: In 1971, as part of the classic volumes on organic molecular photophysics edited by the late J.B. Birks, Labhart and Heinzelmann contributed a review' which contained an extensive compilation of spectral data relevant to the absorption of light by the excited triplet state of organic molecules in condensed phases. The energies of absorption maxima in both fluid solution and in various glasses and solids were recorded together with the corresponding extinction coefficients where known. This compilation was neither limited to a specific class of compounds nor to a particular experimental method as had been the case with previous reviews. Data on the polarization properties of triplet-triplet absorption transitions in rigid matrices were also listed, and a bibliography of theoretical calculations on and assignments of triplet spectra was given. A short discussion of all techniques then currently in use for both transient excitation and extinction coefficient determination was provided.

Table of Contents
Contents 1. Introduction ............................. 2 1.1. Conceptual Background .............. 3 1.2. Historical Perspective ................ 4 2. Methods for Populating and Detecting the Triplet State ............................. 5 2.1. Generation of Triplets by Pulse Radiolysis ........................... 6 2.1.1. Theoretical Concepts .......... 6 2.1.2. Special Considerations for Pulse Radiolysis .................... 6 2.2. Generation of Triplets by Photolysis. ... 7 2.2. I. Theoretical Concepts .......... 7 2.2.2. Special Considerations for Photolysis .................... 7 2.3. Miscellaneous Methods ............... 9 3. Methods for Measuring Extinction Coefficients ............................. 9 3.1. Energy Transfer (ET) Method. ........ 9 3.1.1. Description of Method ......... 9 3.1.2. Kinetic Corrections. ........... 9 3.1.3. Uncertainty in Probability of Transfer.. .................... 10 3.1.4. Special Problems in Radiolytic Excitation.. .................. 10 3.1.5. Special Problems in Flash Photolysis .................... 3.1.6. Summary of Advantages and Disadvantages ................ 3.2. Singlet Depletion (SD) Method. ....... 3.2.1. Description of Method ......... 3.2.2. Reconstruction of True Transient Absorbance. .................. 3.2.3. Corrections for Triplet Decay. .. 3.2.4. Summary of Advantages and Disadvantages ................ 3.3. Total Depletion (TD) Method ......... 3.3.1. Description of Method ......... 3.3.2. A Three-state Excitationdeactivation Model ............ 3.3.3. Corrections for Triplet Decay.. . 3.3.4. Summary of Advantages and Disadvantages ................ 3.4. Relative Actinometry (RA) Method. ... 3.4.1. Description of Method ......... 3.4.2. Corrections for Singlet Depletion .................... 3.4.3. Corrections for Triplet Decay. .. 3.4.4. Corrections for Laser Excitation. 3.4.5. Extensions. ................... 01986 by the U.S. Secretary of Commerce on behalf of the United 3.4.6. Summary of Advantages and ................ States. This copyright is assigned to the American Institute of Physics Disadvantages 16 and the American Chemical Society. 3.5. Intensity Variation (IV) Method ....... 16 Reprints available from ACS; see Reprints List at back of issue. 3.5.1. Description of Method. ........ 16 0047-2689/86/010001-99/$20.00 1 J. Phys. Chem. Ref. Data, Vol. 15, No. 1,1986

 

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