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Journal of Chemistry
Volume 2013 (2013), Article ID 136908, 5 pages
Research Article

Characterization of Triphenylamino-Based Polymethine Dyes

1Department of Chemistry, University of Jyväskylä, FI-40014 Jyväskylä, Finland
2Chemical Resource Laboratory, Bio-Resources Division, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
3Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
4Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia

Received 6 December 2012; Revised 29 March 2013; Accepted 14 April 2013

Academic Editor: Alexander Tatarinov

Copyright © 2013 Saleem Ullah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this high-technology application, age functional dyes especially polymethine dyes have captured much attention of the researchers due to their immense potential for high-tech uses. Polymethine dyes show promising absorption spectra in the visible range, which can be easily exploited for the use of written text copying, photographic imaging, or photothermographic recording materials. Keeping this in mind, our research is composed of an investigation of two triphenylamino-based polymethine dyes, a known polymethine dye 3 and a new one polymethine dye 5, which have been synthesized by the reaction of 4-(diphenylamino) benzaldehyde 2 and 4, -(phenylazanediyl) dibenzaldehyde 4 with 4, -vinylidene-bis(N, N-dimethylaniline) 1. Based on bis-dimethylaminophenylethylene moiety, the new polymethine dye showed more high absorption spectra in the range of 600–700 nm than that of the known polymethine dye based on bis-dimethylaminophenylethylene moiety. Their maximum spectra were exhibited at 637 nm and 653 nm, respectively. Their leuco-converted reversible colored forms were also investigated.