Accession Number : AD0821246

Title :   QUENCHING OF THE TRIPLET STATE OF BENZIL BY RARE EARTH CHELATES.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Lopes, Duarte Alvaro

Report Date : MAR 1967

Pagination or Media Count : 55

Abstract : Quenching of the triplet state of benzil by rare earth-tris dipivaloylmethane chelates was studied in degassed cyclohexane solutions at 18 C. A spectrophotofluorometer was used for all measurements of phosphorescence intensity. Compounds were chosen such that quenching by electronic energy transfer was not expected. Stern-Volmer graphs were constructed for the observed quenching, and the slopes from these graphs were used to calculate quenching rate constants of the order 10,000,000/M sec. The magnitude of these constants indicates that the quenching is not diffusionally controlled, and that the quenching is the result of enhanced spin-orbit coupling in the presence of the chelate. (Author)

Descriptors :   *RARE EARTH COMPOUNDS), (*ELECTRON TRANSITIONS, QUENCHING(INHIBITION)), (*CHELATE COMPOUNDS, (*PHOSPHORESCENCE, ABSORPTION SPECTRA), CYCLOHEXANES, METHANE, KETONES, MOLECULAR ORBITALS, GRAPHICS, DIFFUSION, ELECTRON TRANSITIONS, MOLECULAR SPECTROSCOPY, ORGANIC SOLVENTS, ATOMIC ENERGY LEVELS, ENERGY, AROMATIC COMPOUNDS, THESES.

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE