Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4969
Título: UV-Vis spectroscopic study preferential solvation and intermolecular interactions in methanol/1-propanol/acetonitrile by means of solvatochromic probes
Autor: Nunes, Nelson Alberto Frade da Silva
Leitão, Ruben Anacoreta de Seabra Elvas
Martins, Filomena
Palavras-chave: Solvatochromic Probes
Kamlet-Taft Parameters
Solvent Exchange Model
Preferential Solvation
Ternary Mixture
Data: 24-Abr-2014
Editora: Pergamon-Elsevier Science LTD
Citação: NUNES, Nelson Alberto Frade da Silva; LEITÃO, Ruben Anacoreta de Seabra Elvas; MARTINS, Filomena – UV-Vis spectroscopic study preferential solvation and intermolecular interactions in Methanol/1-Propanol/Acetonitrile by means of solvatochromic probes. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. ISSN: 1386-1425. Vol. 124 (2014), pp. 470-479
Resumo: Solvatochromic UV-Vis shifts of four indicators (4-nitroaniline, 4-nitroanisole, 4-nitrophenol and N,N-dimethy-1-4-nitro aniline) have been measured at 298.15 K in the ternary mixture methano1/1-propanol/acetonitrile (MeOH/1-PrOH/MeCN) in a total of 22 mole fractions, along with 18 additional mole fractions for each of the corresponding binary mixtures, MeOH/1-PrOH, 1-PrOH/MeCN and MeOH/MeCN. These values, combined with our previous experimental results for 2,6-dipheny1-4-(2,4,6-triphenylpyridinium-1-yl)phenolate (Reichardt's betaine dye) in the same mixtures, permitted the computation of the Kamlet-Taft solvent parameters, alpha, beta, and pi*. The rationalization of the spectroscopic behavior of each probe within each mixture's whole mole fraction range was achieved through the use of the Bosch and Roses preferential solvation model. The applied model allowed the identification of synergistic behaviors in MeCN/alcohol mixtures and thus to infer the existence of solvent complexes in solution. Also, the addition of small amounts of MeCN to the binary mixtures was seen to cause a significant variation in pi*, whereas the addition of alcohol to MeCN mixtures always lead to a sudden change in a and The behavior of these parameters in the ternary mixture was shown to be mainly determined by the contributions of the underlying binary mixtures. (C) 2014 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4969
DOI: 10.1016/j.saa.2014.01.021
ISSN: 1386-1425
Versão do Editor: http://www.ncbi.nlm.nih.gov/pubmed/24508885
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
UV-Vis spectroscopic.pdf2,5 MBAdobe PDFVer/Abrir    Acesso Restrito. Solicitar cópia ao autor!


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.