FLUORESCENCE AS A MEANS FOR KINETIC-STUDIES OF 4-CENTER TYPE PHOTOPOLYMERIZATION IN THE SOLID-STATE

Fluorescence spectroscopy has been applied to the study of the kinetics of photopolymerization of crystalline, 1,4-bis( beta -pyridyl-2-vinyl) benzene (P2VB), its hydrochloride derivative (P2VB-HCl) and mixed crystals of P2VB and 2,5-distyryl pyrazine (DSP). The photopolymerization is thermally activated with E//a values of 13. 0( plus or minus 1. 1), 19. 0( plus or minus 1. 8) and 15. 5( plus or minus 1. 5) kJ mol** minus **1 for P2VB, P2VB-HCl and mixed crystals of (P2VB plus DSP), respectively. The orientation of the olefinic double bonds plays an important role in the photoreactivity besides the separation distances described earlier by the topochemical postulate.