Add time:07/24/2019         Source:sciencedirect.com

DC-electrical conductivity has been studied for fresh and partially photopolymerized 2,5-distyryl-pyrazine (DSP) single crystals of the α-modification. α-DSP crystals show semiconductivity with a positive activation energy for DC-electrical conduction, Ea = 0.86 eV. The specific conductivity, σ, falls and Ea increases as photopolymerization proceeds due to the consumption of delocalized π-electrons in the formation of cyclobutane rings and also the shrinkage accompanying photopolymerization.This behavior has been contrasted to that of azodiisobutyronitrile (AIBN) crystals. AIBN crystals show semiconductivity for fresh samples that changes to semi-metallic conductivity upon irradiation (λex = 365 or 337 nm).

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