Spectrokinetic studies on new bi-photochromic molecules containing two naphthopyran entities
authors Coelho, PJ; Salvador, MA; Heron, BM; Carvalho, LM
journal TETRAHEDRON
author keywords naphthopyrans; photochromism; bi-photochromic; bi-naphthopyrans
keywords BIPHOTOCHROMIC SUPRAMOLECULAR SYSTEMS; PHOTOKINETIC BEHAVIOR; NMR-SPECTROSCOPY; PART 1; BRIDGE; SPIROOXAZINE; CHROMENE; MOIETY; HYBRID
abstract 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.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0040-4020
year published 2005
volume 61
issue 49
beginning page 11730
ending page 11743
digital object identifier (doi) 10.1016/j.tet.2005.09.035
web of science category Chemistry, Organic
subject category Chemistry
unique article identifier WOS:000233553600018
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