Abstract
The photoreactivity of 1,4-bis(β-pyridyl-2-vinyl)benzene and distyryl-pyrazine has been investigated using lifetime, Shpol'skii and carbon-13 nuclear magnetic resonance ( 13C NMR) techniques. Our study shows that long-lived emitting species exist in concentrated solutions indicating excited state aggregation that could lead to bimolecular processes in concentrated solutions. It is confirmed that the photoproducts do not emit in the spectral region studied by using the Shpol'skii technique. 13C NMR has been performed only for concentrated solutions, revealing the formation of cis isomers in addition to the occurrence of the previously reported photochemical processes.
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