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1 July 2005 Investigation of Tetherable Distilbazolium Compounds as Fluorescent Probes in Nanostructured Silica Sol-gel Materials
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Abstract

Distibazolium dyes are investigated by steady-state and time-resolved fluorescence techniques in a series of low- and high-viscosity polar solvents and in a silica sol-gel matrix. In all solvents and the sol-gel matrix, an interplay of photoinduced switching between different cis-trans isomers and solvation dynamics is observed. Even in a viscous solution (glycerol) and in silica gel, cis-trans isomerization is solvent-controlled. Whereas in glycerol the solvation results in a time-dependent fluorescence Stokes shift, the solvation-induced spectral heterogeneity in silica gel is mostly static, possibly due to a close proximity of dye molecules to the silica surfaces of the nanopores. Compared to low-viscosity solvents, where the cis-trans isomerization process takes place with a solvent-dependent rate on the timescale of about 120–150 ps, it slows down to about 1100–1400 ps in glycerol and about 1500 ps in a sol-gel matrix. Additionally, fluorescence kinetics of the dyes in the sol-gel reveals the presence of a range of different “frozen-in” conformers exhibiting a broad spectrum of lifetimes from 20 to 300 ps.

E. P. Petrov, F. Cichos, F. Wagner, St Spange, and C. von Borczyskowski "Investigation of Tetherable Distilbazolium Compounds as Fluorescent Probes in Nanostructured Silica Sol-gel Materials," Photochemistry and Photobiology 81(4), 898-907, (1 July 2005). https://doi.org/10.1562/2004-09-29-RA-332R.1
Received: 29 September 2004; Accepted: 1 February 2005; Published: 1 July 2005
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