UNSPECIFIED (2001) Solid-state optical properties of the methyl-exopyridine-anthracene rotaxane. CHEMICAL PHYSICS, 269 (1-3). pp. 381-388. ISSN 0301-0104

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Abstract

Photophysical properties in the solid state of both, an anthracene grafted rotaxane and the corresponding thread are studied. The thread in liquid and solid states as well as the rotaxane in the liquid phase exhibit only the usual anthracene-like photoluminescence (PL) behaviour, while the rotaxane polycrystalline powder emits a broad structureless red-shifted band. The excitation spectrum of the rotaxane reveals the presence of low-lying states below the absorption feature of the anthracene, the one of the thread reproducing quite accurately the absorption spectrum, Site-selective PL measurements show that the broad emission of the rotaxane is a superposition of two contributions corresponding to energy levels which can be photoexcited directly within the low energy absorption tail, Time resolved Pt. measurements reveals immediately after excitation the characteristic features of the anthracene-like emission, indicating an energy transfer from the excited anthracene moiety to the structural defect states giving rise to the unusual radiative emission. (C) 2001 Elsevier Science B,V, All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	CHEMICAL PHYSICS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0301-0104
Date:	1 July 2001
Volume:	269
Number:	1-3
Number of Pages:	8
Page Range:	pp. 381-388
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/12048

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