REACTIVITY OF SINGLET OXYGEN TOWARD STRAINED SUBSTRATES AND A NOVEL WON-PHOTOCHEMICAL METHOD FOR DETERMINATION OF QUENCHING CONSTANTS OF SINGLET OXYGEN.

ABSTRACT: Rate constants for quenching of 102 by a number of strained molecules have been determined by the competitive rubrene photooxidation method; the rate constant for quenching by Q may be evaluated by adaption of a kinetic analysis already in the literature for the rubrene photooxidation method. INTRODUCTION. Although rate constants for deactivation of singlet molecular oxygen ('0,) by a large number of quenchers in fluid solution have been reported ' only a few values pertain to the quenching of "strained substrates. " Because of their inherent reactivity, complications can occur when strained substrates are employed as quenchers. It is, however, of interest to deter-mine whether the "strain " which enhances chemical reactivity can also induce an enhanced reac