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Photochromic and thermochromic spirans

IX. Prediction of the stabilities of spiropyran structures and the electronic absorption spectra of their photocolored and thermocolored isomers

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Chemistry of Heterocyclic Compounds Aims and scope

Abstract

The self-consistent-field (SCF) molecular orbital (MO) Pariser-Parr-Pople (PPP) methods within the Dewar σ,π parametrization for the calculation of the properties of the ground states and variable β for the description of the excited states were used to estimate the relative stabilities of the spiropyran forms in spiranmerocyanine valence-tautomeric equilibria and to predict the electronic spectra of the photocolored and thermocolored forms of spirans. A correlation was found between the energies of anionic localization of the heterocation and the electron charge in the hypothetical position of spirocyclization and the experimental data on the stability of the spiropyran form. Another correlation links the calculated differences in the energies of the pyran and quinoneallide systems with the tendency of the latter to undergo cyclization. The stabilities of a large number of spiropyrans with different structures are predicted on the basis of the correlations obtained. The effect of various structural factors on the absorption spectra of the merocyanine forms of spiropyrans was studied. 2H-Naphtho[2,3-b]-pyran systems are recommended as promising photochromic compounds.

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See [1] for communication VIII.

Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1180–1192, September, 1978.

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Simkin, B.Y., Minkin, V.I. & Nivorozhkin, L.E. Photochromic and thermochromic spirans. Chem Heterocycl Compd 14, 948–959 (1978). https://doi.org/10.1007/BF00509547

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  • DOI: https://doi.org/10.1007/BF00509547

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