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Effets de substituant, d'hétéroatome et de solvant sur les cinétiques de décoloration thermique et les spectres d'absorption de photomérocyanines en série spiro[indoline‐oxazine]
Author(s) -
Pottier Eliane,
Dubest Roger,
Guglielmetti Robert,
Tardieu Pascale,
Kellmann Arlette,
Tfibel Francis,
Levoir Patrick,
Aubard Jean
Publication year - 1990
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19900730210
Subject(s) - indoline , chemistry , substituent , photochromism , heteroatom , oxazines , kinetics , photochemistry , solvent , medicinal chemistry , stereochemistry , organic chemistry , ring (chemistry) , physics , quantum mechanics
Substituent, Heteroatom, and Solvent Effects on the Thermal‐Bleaching Kinetics and Absorption Spectra of Photomerocyanines Issued from Spiro[indoline‐oxazines] Quantitative information useful for the development of new photochromic systems is obtained from the study of heteroatom and substituent effects on the thermal‐bleaching kinetics and the absorption spectra of the photomerocyanines issued from spiro[indoline‐oxazines]. The effect on photochromic properties of the presence of N‐atoms either in the dimethine bridge or in the aromatic rings has been investigated through the comparison of spiro[indoline‐naphthopyrans] C with spiro[indoline‐naphthoxazines] A and with spiro[indoline‐quinolinoxazines] B . Besides the occurrence of biexponential thermal‐bleaching kinetics in non‐polar solvents is observed: a tentative explanation for this observation is given which involves the formation, in either sequential or parallel steps, of energetically distinct stereoisomers of the opened form.