Structures and photochromic properties of substituted spiroindolinonaphthoxazines |
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Authors: | S. M. Aldoshin I. I. Chuev O. S. Filipenko A. N. Utenyshev V. Lokshin P. Laregenie A. Samat R. Guglielmetti |
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Affiliation: | (1) Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;(2) ERS 158 CNRS, Mediterranean University at Luminy, Case 901, 13288 Cedex 9, France;(3) Present address: Faculte des Sciences de Luminy, ERS 158 CNRS, Université de la Mediterranee, Case 901, 13288 Marseille, Cedex 9, France |
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Abstract: | Six indolinospironaphthoxazines were studied by X-ray diffraction analysis. It was demonstrated that the electronic nature of the substituents in the naphthoxazine and indoline fragments has no substantial effect on the Cspiro−O and Cspiro−N bond lengths. Photocolorability of the compounds under study depends only slightly on the abovementioned bond lengths and correlates mainly with the energy of steric strain of the oxazine ring. The stability of the open forms of spiroindolinonaphthoxazines that formed upon photoirradiation is determined to a large extent by the electronic and steric nature of the substituents. The exception is the compound that contains the NO2 group in the indoline fragment. In the last-mentioned case, the cleavage of the ring occurs through a substantially different pathway. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1121–1128, June, 1998. |
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Keywords: | spirooxazines X-ray diffraction analysis photochemistry in solutions structure-property relationship |
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