Spin trap study of photoinitiations

Journal Article · Sat Mar 01 04:00:00 EST 1986 · Dokl. Phys. Chem. (Engl. Transl.); (United States)

OSTI ID:7128896

Baumann, H; Fok, N V; Mel-nikov, M Y; Timpe, J; Zubarev, V E

This paper investigates the initial radical products of the photolysis of various photoinitiators of the C/sub 6/H/sub 5/CO-R type using the spin trap method and examines the possibility of using this method to obtain values of the quantum yields for radical formation and the rate constants of the elementary reactions occuring. Phenyl-tert-butylnitron (PBN) was used as the spin trap. Photoinitiators 1-15 were synthesized and purified by standard methods. The ESR spectra show that on photolysis of initiator 14 there are formed, in addition to adducts of C/sub 6/H/sub 5/CO radicals, stable triphenylmethyl radicals (C/sub 6/H/sub 3/)/sub 3/ which do not react with PBN under experimental conditions. Values are given for the quantum yields for the formation of C/sub 6/H/sub 5/CO-PBN adducts found from the initial portions of the rate curves, the quantum yields for photolysis of the initiators, and the rate constants for the reaction.

• Research Organization: M.V. Lomonsov Moscow State Univ.
• OSTI ID: 7128896
• Journal Information: Dokl. Phys. Chem. (Engl. Transl.); (United States), Journal Name: Dokl. Phys. Chem. (Engl. Transl.); (United States) Vol. 284:1-3; ISSN DKPCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ADDUCTS
ANGULAR MOMENTUM
BENZOYL RADICALS
BINDING ENERGY
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON SPIN RESONANCE
ENERGY
EQUATIONS
ITERATIVE METHODS
KINETIC EQUATIONS
KINETICS
MAGNETIC RESONANCE
NUMERICAL SOLUTION
PARTICLE PROPERTIES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTOSENSITIVITY
POLYMERIZATION
RADICALS
REACTION KINETICS
RESONANCE
RUNGE-KUTTA METHOD
SENSITIVITY
SPIN
TRAPS
YIELDS