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A vibrational spectroscopic survey of CO2-expanded ethanol solutions of hexamethylenetetramine allows the investigation of the organization of solvent molecules in the solute cybotactic region. The synergistic solubility enhancement observed in this system is explained by the occurrence of co-operative interactions of EtOH and CO2 around hexamethylenetetramine molecules, as schematized in the picture.
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Sala et al. (2005) studied this question.
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