Accession Number:

ADA191251

Title:

Enhanced Oxidation and Solvolysis Reactions in Chemically Inert Microheterogeneous Systems.

Descriptive Note:

Interim rept. no. 4, Jul-Dec 86,

Corporate Author:

ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)

Personal Author(s):

• Braun, Andre M.

Report Date:

1987-01-13

Pagination or Media Count:

18.0

Abstract:

Apparent rate constants and quantum yields have been determined for the rose bengal sensitized photooxidation of 10-methyl phenothiazine in methanol and in OW and WO microemulsions. A Stern-Volmer analysis of the luminescence of singlet oxygen in solutions of CD3OD containing different concentrations of the phenothiazine in derivative revealed a very efficient quenching of the triplet-state of rose bengal by the substrate. Evaluation of rate constants and local concentrations of sensitizer and substrate leads to the conclusion that the rather low quantum yields of photooxidation of 10-methyl phenothiazine in the three media investigated is mainly due to the efficiently competing deactivation of the triplet state of the sensitizer by the substrate. For decontamination purposes, photochemically initiated singlet oxygen reactions may not be recommended due to the many efficient deactivating processes of singlet oxygen and of the triplet state of the sensitizer.

Descriptors:

• *CHEMICAL REACTIONS
• *OXIDATION
• *PHOTOCHEMICAL REACTIONS
• *SOLVOLYSIS
• CARBINOLS
• CONSTANTS
• DEACTIVATION
• DECONTAMINATION
• EFFICIENCY
• LUMINESCENCE
• OXYGEN
• QUANTUM EFFICIENCY
• QUENCHING
• RATES
• SUBSTRATES

Subject Categories:

• Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE