Why is the CO2-CS2 non-ideality larger than in CO2-CCl4? A Raman scattering study

resumo

The dense phases of the CO2-CCl4 (I) and CO2-CS2 (II) mixtures have been studied by Raman spectroscopy. Mixture I is found almost ideal and II strongly non-ideal. At high CS2 concentration in II, the local structure of CS2 is preserved suggesting a nano-segregation of the liquid phase without demixing whereas in CO2 concentrated mixtures a diversity of species are present. Thermodynamical considerations together with spectroscopic results show that a subtle interplay between attractive and repulsive interactions leads to this non-ideal behaviour. The connection of these results with the liquid-liquid demixing reported for CO2-CS2 at lower temperature is discussed. (C) 2013 Elsevier B. V. All rights reserved.

palavras-chave

INTERACTION-INDUCED SPECTRA; LIQUID CARBON-DISULFIDE; COMPLEX-FORMATION; CS2; MIXTURES; DIOXIDE; CO2; SOLVENTS; TEMPERATURE; CO2-ACETONE

categoria

Chemistry; Physics

autores

Besnard, M; Cabaco, MI; Coutinho, JAP; Danten, Y

nossos autores

agradecimentos

This Letter was partly funded by FCT through the project Pest-C/CTM/LA0011/2011.

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