resumo
The use of ionic liquids as a media for dissolving DNA holds great promise for the development of new base materials in electrochemistry. This paper reports the systematic study of the effect of two nucleic acid bases, uracil and adenine, on the ionicity of 1-alkyl-3-methylimidazolium acetates achieved by monitoring several thermodynamic and transport properties. Density, dynamic viscosity, speed of sound, refractive index and ionic conductivity of 1-ethyl-3-methylimidazolium acetate and 1-butyl-3-methylimidazolium acetate were studied as a function of temperature at atmospheric pressure. The thermal expansion coefficients and molar volumes of these ionic liquids were calculated from the experimental density values. The various properties of the binary mixtures 1-ethyl-3-methylimidazolium acetate with uracil or adenine, namely, their ionic conductivity, density and viscosity in the temperature range 298 K-343 K were determined as a function of the nucleobase content. Walden plots were determined and used to clarify the role of the nucleobases in the ionic liquids ionicity. (C) 2012 Elsevier Ltd. All rights reserved.
palavras-chave
PHASE-BEHAVIOR; ELECTROLYTIC CONDUCTIVITY; THERMODYNAMIC PROPERTIES; CARBON-DIOXIDE; DNA FILMS; DISSOLUTION; MIXTURES; TEMPERATURES; CHEMISTRY; PRESSURE
categoria
Thermodynamics; Chemistry
autores
Araujo, JMM; Pereiro, AB; Alves, F; Marrucho, IM; Rebelo, LPN
nossos autores
Isabel Maria Delgado Jana Marrucho Ferreira
Professor CatedráticoGrupos
Projectos
Development of New Oxygen Therapeutics using Fluorinated Ionic Liquids (PTDC/EQU-FTT/118800/2010)
agradecimentos
J.M.M. Araujo gratefully acknowledges the financial support from FCT/MCTES (Portugal) through Post-Doc Grant SFRH/BPD/65981/2009. A. B. Pereiro acknowledges Marie Curie Actions - Intra-European Fellowships (IEF) for a contract under FP7-PEOPLE-2009-IEF - 252355 - HALOGENILS. I. M. Marrucho acknowledges FCT/MCTES for a contract under Programa Ciencia 2007. The financial support from FCT/MCTES through projects PTDC/EQU-EPR/104554/2008, PTDC/EQU-FTT/116015/2009 and PTDC/EQU-FTT/118800/2010 is gratefully acknowledged. In addition, the authors wish to thank A. Dominguez for her contribution to measuring the density, speed of sound and refractive index of the pure ionic liquids.