RSC Publishing


Publishing

 

Cover image for New Journal of Chemistry, select for current issue

New Journal of Chemistry

New Journal of Chemistry.... the home of new and emerging multidisciplinary work in the chemical sciences.



Subscribers

Non-subscribers

Free access



Paper

New J. Chem., 2009, 33, 2311 - 2316, DOI: 10.1039/b9nj00332k

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

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

Donor––acceptor type pyridinium dyes that have been newly synthesized showed bathochromic shift of the absorption band with decreasing dielectric constant (r) of solvent (negative solvatochromism), and the bathochromic shifts in halogenated solvents were larger than those in non-halogenated solvents of similar 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.

Graphical abstract image for this article (ID: b9nj00332k)