Linked Life Data

12477042

Source:http://linkedlifedata.com/resource/pubmed/id/12477042

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pubmed-article:12477042pubmed:issue13lld:pubmed
pubmed-article:12477042pubmed:dateCreated2002-12-12lld:pubmed
pubmed-article:12477042pubmed:abstractTextWe have characterized the spectroscopy properties of crystal violet (CV+) and ethyl violet (EV+) in liquid solutions as a function of the solvent type and dye concentration. The analysis of how solvent properties and dye concentration affects the electronic spectra of these tri-para-dialkylamino substituted tryarylmethane (TAM+) dyes was performed on the basis of two spectroscopic parameters, namely the difference in wavenumber (deltanu) between the maximum and the shoulder that appears in the short-wavelength side of the respective maximum visible band (deltanu = 1/lambda(shoulder)-1/lambda(max) cm(-1)), and the wavelength of the maximum absorption (lambda(max)). The solvent and the concentration effects on lambda(max) and deltanu have indicated that both solute/solute (ion-pairing and dye aggregation) and solute/solvent (H-bonding type) interactions modulate the shape of the visible electronic spectra of these dyes in solution. In solvent with small dieletric constant (epsilon < approximately 10), the formation of ion-pairs represents a major contribution to the shaping of these spectra. Upon increasing dye concentration the formation of ion-pairs was characterized by an increase in deltanu observed concomitantly with a red shift in lambda(max) In chloroform and chlorobenzene the ion-pair association constant of CV+ and EV+ with Cl- ions were found to be in the order of 10(6) and 10(5) M(-1), respectively. In trichloroethylene the association constant for the CV+Cl- pair was 10(8) M(-1). In water, dye aggregation instead of ion-pairing represents a major contribution to the shaping of the visible spectra of CV+ and EV+. Dye aggregation was indicated by an increase in deltanu observed concomitantly with a blue shift in lambda(max) upon increasing dye concentration. The distinct behavior of deltanu for dye aggregation and ion-pairing as a function of dye concentration can therefore assist in the characterization of these two distinct phenomena. The solute/solvent interactions were studied in a series of polar solvents in which solute/solute interactions do not occur in any detectable extent. The dependence found for deltanu as a function of the Kamlet-Tafts solvatochromic parameters (alpha, beta and pi*) is in keeping with previous inferences indicating that the splitting in the overlapped absorption band of CV+ and EV+ in hydroxilated solvents arises from a perturbation in the molecular symmetry induced by hydrogen bonding (donor-acceptor) type interactions with solvent molecules. A distinction between the effects of solute/solute and solute/solvent interactions on the visible spectra of these dyes is provided.lld:pubmed
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pubmed-article:12477042pubmed:statusMEDLINElld:pubmed
pubmed-article:12477042pubmed:monthNovlld:pubmed
pubmed-article:12477042pubmed:issn1386-1425lld:pubmed
pubmed-article:12477042pubmed:authorpubmed-author:IndigGuilherm...lld:pubmed
pubmed-article:12477042pubmed:authorpubmed-author:OliveiraCarla...lld:pubmed
pubmed-article:12477042pubmed:authorpubmed-author:BrancoKerlley...lld:pubmed
pubmed-article:12477042pubmed:authorpubmed-author:BaptistaMauri...lld:pubmed
pubmed-article:12477042pubmed:issnTypePrintlld:pubmed
pubmed-article:12477042pubmed:volume58lld:pubmed
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pubmed-article:12477042pubmed:authorsCompleteYlld:pubmed
pubmed-article:12477042pubmed:pagination2971-82lld:pubmed
pubmed-article:12477042pubmed:dateRevised2006-11-15lld:pubmed
pubmed-article:12477042pubmed:meshHeadingpubmed-meshheading:12477042...lld:pubmed
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pubmed-article:12477042pubmed:year2002lld:pubmed
pubmed-article:12477042pubmed:articleTitleSolvent and concentration effects on the visible spectra of tri-para-dialkylamino-substituted triarylmethane dyes in liquid solutions.lld:pubmed
pubmed-article:12477042pubmed:affiliationDepartamento de Bioquímica, Instituto de Quimica, Universidade de Sao Paulo, São Paulo, C.P. 26077, 05599-970. SP, Brazil.lld:pubmed
pubmed-article:12477042pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12477042pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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