Accession Number : ADA136308

Title :   Products of Photodegradation for Coumarin Laser Dyes.

Descriptive Note : Technical rept. no. 7, 1 Jan-31 Oct 82,

Corporate Author : BOSTON UNIV MA DEPT OF CHEMISTRY

Personal Author(s) : Jones,G , II ; Jackson,W R ; Kanoktanaporn,S ; Bergmark,W R

PDF Url : ADA136308

Report Date : 31 Oct 1983

Pagination or Media Count : 15

Abstract : The products of conventional photolysis of the coumarin laser dyes, C1, C35, C153, and C152 have been investigated, The previously reported dealkylation of C1 is documented for the fluorinated dyes, C35, and C152 in deaerated solvents. In addition, a reduction product is identified for C1, consistent with a radical mechanism for decomposition. Evidence is provided that the concentration quenching (self quenching) of singlet dye is important to the degradation mechanism. For the rigid dye, C153, a photooxidation product involving the amine functionality results from decomposition in aerated media. For several dyes, very low triplet yields have been measured. (Author)

Descriptors :   *Dyes, *Coumarins, *Photodegradation, *Lasers, Photolysis, Amines, Alkyl radicals, Reduction(Chemistry), Oxidation, Fluorination, Concentration(Chemistry), Quenching, Acetonitrile, Deaeration

Subject Categories : Radiation and Nuclear Chemistry
      Lasers and Masers
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE