Solvatochromism of novel donor–π–acceptor type pyridinium dyes in halogenated and non-halogenated solvents

Yousuke Ooyama; Risa Asada; Shogo Inoue; Kenji Komaguchi; Ichiro Imae; Yutaka Harima

doi:10.1039/B9NJ00332K

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New Journal of Chemistry

Issue 11, 2009

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Solvatochromism of novel donor–π–acceptor type pyridinium dyes in halogenated and non-halogenated solvents

Yousuke Ooyama , Risa Asada , Shogo Inoue , Kenji Komaguchi , Ichiro Imae and Yutaka Harima

New J. Chem., 2009, 33, 2311-2316

DOI: 10.1039/B9NJ00332K
Received 14 Jul 2009, Accepted 18 Aug 2009
First published on the web 17 Sep 2009

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Donor–π–acceptor type pyridinium dyes that have been newly synthesized showed bathochromic shift of the absorption band with decreasing dielectric constant (ε_r) of solvent (negative solvatochromism), and the bathochromic shifts in halogenated solvents were larger than those in non-halogenated solvents of similar ε_r values. The influences of halogenated solvents on the large bathochromic shifts are studied on the basis of ¹H NMR measurements, semi-empirical molecular calculations (AM1 and INDO/S using the SCRF Onsager model), and absorption spectral measurements of the dyes adsorbed on nanocrystalline TiO₂ film immersed in solvents.

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Yousuke Ooyama
Risa Asada
Shogo Inoue
Kenji Komaguchi
Ichiro Imae
Yutaka Harima

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New Journal of Chemistry

Solvatochromism of novel donor–π–acceptor type pyridinium dyes in halogenated and non-halogenated solvents

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