ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Photo- and thermochromism. II. Effect of conjugation on the absorption intensity of the nitro group of 8-bromo-1',3',3'-trimethyl-6-nitrospiro[chromene-2,2'-indoline]

M. Leščinský

Institute of Radio and Electronics Engineering, Czechoslovak Academy of Sciences, 180 88 Prague

Abstract: The paper deals with the reversible changes of absorption intensities of the nitro group of S-bromo-1',3',3'-trimethyl-G-nitrospirofchromene 2,2'-indoline) doped into a polyacrylonitrile thin film in the infrared region. The X-ray structural analysis proved the random orientation of pyrans in the polymer matrix. The reversible changes of absorption intensities of the symmetrical and asymmetrical nitro group vibrations were explained by the altered conjugation of pyrans upon exposure to irradiation.

Full paper in Portable Document Format: 276a792.pdf

Chemical Papers 27 (6) 792–795 (1973)