É. R. Zakhs, A. Ponyaev, M. A. Subbotina
Jul 1, 2001
Citations
0
Influential Citations
5
Citations
Journal
Russian Journal of General Chemistry
Abstract
Abstract2-(3-Nitro-2-pyridylmethyl)benzazoles were synthesized, and their photochromic properties were studied by flash photolysis. Introduction of a nitropyridyl instead of the nitrophenyl moiety into the 2-methyl group insignificantly increases the basicity of the methylene group. Nitropyridyl-substituted benzazoles give rise to three detectable photoinduced forms: the corresponding anion at pH > 10, azamerocyanine at pH ≈ 4 , and monomethinecyanine at pH ≈ 1. Irradiation of solutions of weakly basic benzoxazole and benzothiazole derivatives at pH ≈ 4 results in formation of neutral chelate structures in which the hydrogen atom is linked simultaneously to two nitrogen atoms: one in the pyridine ring, and the second, in the azole ring.