Abstract
As with diphenylcarbene, 1- and 2-NPCs in Shpolskii matrices at low temperatures present broad and red-shifted sharp spectra. The concentration dependence of the relative intensities of these spectra indicates that energy transfer is very efficient in these systems. In the case of 2-NPC in n-heptane at 77 K, a ligth-induced interconversion between two fluorescence spectra is observed and tentatively attributed to conformational isomerization
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