LUMINESCENCE QUENCHING IN GEMINATE PAIRS 1,2,3,4-TETRAMETHYLNAPHTHALENE-OXYGEN

Simultaneous quenching of both triplet and singlet states of 1,2,3,4-t etramethylnaphthalene by oxygen during separation of the geminate pair (1,2,3,4-tetramethylnaphthalene)/O-2, produced by 1,2,3,4-tetramethyl naphthalene endoperoxide photolysis at low temperatures observed. Fluo rescence and phosphorescence relative intensity immediately after phot olysis and during pair separation make it possible to obtain informati on about pair distribution function and its time dependence. Fluoresce nce and phosphorescence kinetic curves can be adequately described in terms of diffusion model. Oxygen diffusion coefficients were measured at various temperatures near 77 K. (C) 1998 Published by Elsevier Scie nce B.V. All rights reserved.