The molecular design, synthesis and photochromic properties of spirooxazines containing a permanent azo (hydrazone) chromophore
摘要:
A range of molecular modelling techniques has been applied to predict optimized geometrical conformations and energies of the ring-closed oxazine form and ring-opened merocyanine forms of three azospirooxazines. A comparison of the relative stabilities of the possible isomers of the merocyanines was carried out by applying molecular mechanics (augmented MM2), while the prediction of the potential for photochromic behaviour was made by comparison of the heats of formation calculated by AMI. Synthetic routes were explored and as a result two azospirooxazines were isolated, one of which showed interesting and unusual photochromic behaviour. The instability of this compound towards purification by chromatography was investigated. The decomposition product was isolated and characterized with the aid of single crystal x-ray crystallography. The correlation between predicted and observed photochromic behaviour is discussed. (C) 2013 Elsevier Ltd. All rights reserved.
作者:O. A. Fedorova、S. P. Gromov、Yu. P. Strokach、Yu. V. Pershina、S. A. Sergeev、V. A. Barachevskii、G. Pepe、A. Samat、R. Guglielmetti、M. A. Alfimov
DOI:10.1007/bf02494754
日期:1999.10
Methods for the synthesis of new spironaphthooxazines containing an aza-15-crown-5 fragment in two different positions (5′ and 9′) were developed. The spectral and photochemical properties of these compounds suggest that two competitive complexation processes occur with alkaline-earth or rare-earth metal cations differing in efficiency and selectivity. A metal cation occupies the optimum position in
Highly efficient green synthesis of the photochromic spironaphthoxazines using an eco-friendly choline hydroxide catalyst
作者:Shailesh N. Vajekar、Ganapati S. Shankarling
DOI:10.1080/00397911.2019.1694690
日期:2020.2.1
Abstract A greener route for the synthesis of the photochromic spironaphthoxazines employing a highlyefficient, biodegradable and recyclable choline hydroxide catalyst in an aqueous medium has been described. This methodology offers diverse advantages such as mild reaction conditions, short reaction time (1 h), excellent yields (up to 91%), and operational simplicity that make it a useful and attractive
A mechanochromic coating composition is disclosed comprising a polymeric network incorporating a plurality of ring-opening mechanophores each bound at two positions thereof within said polymeric network.
The present invention relates to a polymer composition that includes a polymer having at least one polymer segment represented by the following Formula (I),
With reference to Formula (I): M independently for each w is a residue of a monomer; φ is a residue of a mechanochromic compound having at least two reactive groups that are each independently bonded to one monomer residue M; w, independently for each z, is an integer of at least 1; and z is an integer of at least 2. The mechanochromic compound is selected from at least one of the following,
(a) a spirooxazine compound represented by the following Formula (II),
and
(b) an indenonaphthopyran represented by the following Formula (III),