Photosensitive cyclophosphazene and polyphosphazene was written by Bao, Rui;Qiu, Jin-Jun;Liu, Shu-Zheng;Cheng, Tao;Li, Dong;Liu, Cheng-Mei. And the article was included in Phosphorus, Sulfur and Silicon and the Related Elements in 2008.COA of Formula: C10H16BrN This article mentions the following:
Functional polyphosphazenes, such as fire retardant materials, high-performance rubber, biopolymer, optical materials and tissue engineering scaffold materials, have been attracted many attentions in recent years. A photosensitive polyphosphazene containing pyridinium groups was reported in this article. The synthesis procedures of preparing photosensitive polyphosphazene with pyridinium unit as side group are carried out. The Mw and Mn of polymer B and polymer C are 4.05 x 106 g/mol and 4.69 × 105 g/mol, resp. For the Polymer C is highly sensitive to light irradiation, it must be kept under dark. Comparing the absorption spectra of polymer B and Polymer C, there is a new absorption spectrum appearing at 357 nm in polymer C2’s curves. It resulted from the formation of conjugated structure. Under UV irradiation, those double bonds underwent cycloaddition reaction to form saturated structure, so the absorption peak at 357 nm decreased with increasing the irradiation time. In the experiment, the researchers used many compounds, for example, 1-Butyl-4-methylpyridin-1-ium bromide (cas: 65350-59-6COA of Formula: C10H16BrN).
1-Butyl-4-methylpyridin-1-ium bromide (cas: 65350-59-6) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. COA of Formula: C10H16BrN