Benzoid-quinoid tautomerism of azomethines and their structural analogs: LIV. Dibenzo(benzo)-18-crown-6-containing Imines of 5-hydroxy-2,3-tetramethylene- and 5-Hydroxy-2,3-diphenylbenzo[b]furan-4-carbaldehydes
作者:A. D. Dubonosov、A. V. Tsukanov、E. N. Shepelenko、Yu. V. Revinskii、V. A. Bren’、V. I. Minkin
DOI:10.1134/s1070428009020079
日期:2009.2
Dibenzo(benzo)-18-crown-6-containing N-arylimines of 5-hydroxy-2,3-tetramethylene- and 5-hydroxy-2,3-diphenylbenzo[b]-furan-4-carbaldehydes were synthesized and their spectral luminescence properties were investigated. In solutions of 6-bromo- and 6-nitro-substituted compounds a tautomeric equilibrium exists between the benzoid and quinoid forms. In the course of complexing of crown-ether-imines of 5-hydroxy-6-nitro-2,3-diphenylbenzo[b]furan-4-carbaldehyde and 5-hydroxy-6-nitro-2,3-tetramethylenebenzo[b]furan-4-carbaldehyde with cations of alkali and alkaline earth metals the content of the quinoid form was found to decrease. This phenomenon was accompanied by essential changes in the absorption and fluorescence spectra characteristic of chemosensor systems with an intramolecular charge transfer (ICT).
Photo-and thermochromic spiranes 30*. Comparative study by X-ray structural analysis of the structure of spiropyrans of the indoline series containing a condensed furan fragment
作者:B. S. Lukyanov、A. N. Utenyshev、V. V. Tkachev、S. M. Aldoshin、V. I. Minkin、M. B. Lukyanova、Yu. S. Alekseenko
DOI:10.1007/s10593-008-0034-4
日期:2008.2
The structure of an indoline spiropyran of molecular formula C29H33NO2 has been studied by X-ray crystallographic analysis. Structural parameters have been determined for this spiropyran, containing a condensed furan fragment with a tert-butyl group, in comparison with the structure of other spiropyrans of this series. The observation in the absorption spectrum of a photoinduced cis-cis isomer is linked with its stabilization by the steric effect of the bulky tert-butyl group and the strength of barriers at 77 K.
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作者:V. A. Bren'、A. D. Dubonosov、N. I. Makarova、V. I. Minkin、L. L. Popova、V. P. Rybalkin、E. N. Shepelenko、A. V. Tsukanov