Spectrokinetic studies on new bi-photochromic molecules containing two naphthopyran entities

被引：27

作者：

Coelho, PJ ^{[1
]}

Salvador, MA

Heron, BM

Carvalho, LM

机构：

[1] Univ Tras Os Montes & Alto Douro, Ctr Quim Vila Real, P-5001911 Vila Real, Portugal

[2] Univ Leeds, Dept Colour Chem, Leeds LS2 9JT, W Yorkshire, England

来源：

TETRAHEDRON | 2005年 / 61卷 / 49期

关键词：

naphthopyrans; photochromism; bi-photochromic; bi-naphthopyrans;

D O I：

10.1016/j.tet.2005.09.035

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

A range of new bi-photochromic molecules containing two identical (3a-d) or two distinct naphthopyran units (6a-d), linked through the phenyl substituents located on the sp(3) hybridised pyran ring carbon atom, using conjugated and non-conjugated spacers, have been synthesised from bis-propynols and (substituted) naphthols. Study of the spectrokinetic properties of these compounds under near UV-vis continuous irradiation conditions revealed that the two naphthopyran units are stimulated independently leading to open forms with higher colourabilities but without affecting the individual bleaching kinetics. Compared to the individual photochromic components and to model mono-photochromes it was observed that the nature of the bridge has a small effect on the photochromic properties of each system. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：11730 / 11743

页数：14

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