Synthesis and characterization of a group of new medium responsive non-symmetric viologens. Chromotropism and structural effects

Papadakis, R; Deligkiozi, I; Tsolomitis, A

dc.contributor.author	Papadakis, R	en
dc.contributor.author	Deligkiozi, I	en
dc.contributor.author	Tsolomitis, A	en
dc.date.accessioned	2014-03-01T02:14:46Z
dc.date.available	2014-03-01T02:14:46Z
dc.date.issued	2012	en
dc.identifier.issn	01437208	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30108
dc.subject	Betaines	en
dc.subject	Chromotropism	en
dc.subject	Dipole moments	en
dc.subject	Solvatochromism	en
dc.subject	Substituent effects	en
dc.subject	Viologens	en
dc.subject.other	Betaines	en
dc.subject.other	Chromotropism	en
dc.subject.other	Solvatochromisms	en
dc.subject.other	Substituent effect	en
dc.subject.other	Viologens	en
dc.subject.other	Dipole moment	en
dc.subject.other	Hydrogen bonds	en
dc.subject.other	Solvents	en
dc.title	Synthesis and characterization of a group of new medium responsive non-symmetric viologens. Chromotropism and structural effects	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.dyepig.2012.06.013	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.dyepig.2012.06.013	en
heal.publicationDate	2012	en
heal.abstract	A group of new non-symmetric viologens was synthesized and characterized spectrally using various techniques. These viologens contain active methylene moieties being capable to act as hydrogen bond donors (HBD) and interact in solution with various solvents, the latter acting as hydrogen bond acceptors (HBA). These specific solute-solvent interactions result in intense coloration of the resulting solutions. The chromotropic behavior of these compounds is triggered by basic solvents, and no significant change in color is observed in poorer HBA-solvents, such as several alcohols. The dependence of the color of the solutions on the polarity parameters of solvents (solvatochromism) was investigated. Solvent polarity parameters expressing both dipolarity/ polarizability and basicity of solvents have been used. Finally the correlation of the chromotropic behavior of these compounds with their structure is examined, using both experimental data and Hammett equation. © 2012 Elsevier Ltd. All rights reserved.	en
heal.journalName	Dyes and Pigments	en
dc.identifier.doi	10.1016/j.dyepig.2012.06.013	en
dc.identifier.volume	95	en
dc.identifier.issue	3	en
dc.identifier.spage	478	en
dc.identifier.epage	484	en