Photodegradation of coumarin laser dyes. An unexpected singlet self-quenching mechanism. Technical report, 1 January-31 October 1982

Technical Report · Mon Oct 31 00:00:00 EST 1983

OSTI ID:5104971

Jones, G II; Bergmark, W R

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.

• Research Organization: Boston Univ., MA (USA). Dept. of Chemistry
• OSTI ID: 5104971
• Report Number(s): AD-A-136339/9; TR-4
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COUMARINS
PHOTOLYSIS
ALKYL RADICALS
DECAY
DYES
ETHYL RADICALS
FLUORESCENCE
LACTONES
LASERS
METHYL RADICALS
QUENCHING
TRIPLETS
ANTICOAGULANTS
CHEMICAL REACTIONS
DECOMPOSITION
DRUGS
ESTERS
HEMATOLOGIC AGENTS
HETEROCYCLIC COMPOUNDS
LUMINESCENCE
MULTIPLETS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADICALS
400500* - Photochemistry