Novel Photosensitizer and Methoxy Styryl Pyridines for Photoradical Initiator System

Distyryl pyridine (DSP) photosensitizer for HABI photoinitiator systems was newly designed and eleven methoxy DSP(distyrylpyridines)s were synthesized and evaluated. The results showed that 2, 4-dimethoxy DSP (24DMOP-DSP) was the most efficient among studied methoxy DSPs. Compared with coumarin 1 as reference, the photosensitivity for 24DMOP-DSP as photosensitizer was increased by 150%. Potential of DSP as photosensitizer was supported by the mechanism study, such like photobleaching property of 24DMOP-DSP, derived from configuration change of E to Z, and efficient fluorescence quenching of excited singlet DSP by BCIM.