Kamogawa, Hiroyoshi published the artcileOrganic solid photochromism by photoreduction mechanism: aryl viologens embedded in poly(N-vinyl-2-pyrrolidone), SDS of cas: 47369-00-6, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (1988), 26(2), 653-6, database is CAplus.
The reversible photocolor development (photochromism) is reported of N,N‘-diaryl-γ,γ’-dipyridylium dichlorides (aryl viologens) in a poly(N-vinyl-2-pyrrolidone) matrix. Green colors appeared in this case because of the extension of delocalization of electrons of the cation radical caused by the conjugation of aryl groups. Sensitivities to UV light were generally higher than those of conventional benzyl-type viologens.
Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, SDS of cas: 47369-00-6.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem