Photodegradation of Coumarin Laser Dyes. An Unexpected Singlet Self-Quenching Mechanism.

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Abstract:

Photolysis of aminocoumarine laser dyes, including 7-diethylamino-4-methyl-coumarin has been investigated. Dealkylation of groups at the 7-dialkylamino functionality, reduction of the lactone moiety and overall photodecomposition of dyes have been observed. Concentration quenching of dye fluorescence is important at concentrations above 0.01 M. The photolysis is ascribed to singlet self quenching triplet states are formed in low yield flash photolysis and are not reactive. Author

Author(s):
Jones, G., Ii ; Bergmark, W. R.
Author Organization(s):
BOSTON UNIV MA DEPT OF CHEMISTRY
Descriptive Note:
Technical rept. 1 Jan-31 Oct 82,
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-4
Contract/Grant Number(s):
N00014-79-C-0054
 Subject Terms
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*Photolysis, *Dyes, *Coumarins, *Lasers, Ethyl radicals, Methyl radicals, Alkyl radicals, Photodegradation, Reduction(Chemistry), Lactones, Photodecomposition, Quenching, Fluorescence, Electronic states, Concentration(Composition), Decay
Field(s)/Group(s):
Radiation and Nuclear Chemistry, Lasers and Masers, Coatings, Colorants and Finishes
Keyword(s):
Aminocoumarin, Dealkylation, Laser dyes, WUNR395609
Report Date:
1983 Oct 31