title: Thermochemistry of microhydration of sodiated and potassiated monosaccharides.
abstract: The thermochemical properties ΔH(o)(n), ΔS(o)(n), and ΔG(o)(n) for the hydration of sodiated and potassiated monosaccharides (Ara = arabinose, Xyl = xylose, Rib = ribose, Glc = glucose, and Gal = galactose) have been experimentally studied in the gas phase at 10 mbar by equilibria measurements using an electrospray high-pressure mass spectrometer equipped with a pulsed ion beam reaction chamber. The hydration enthalpies for sodiated complexes were found to be between -46.4 and -57.7 kJ/mol for the first, and -42.7 and -52.3 kJ/mol for the second water molecule. For potassiated complexes, the water binding enthalpies were similar for all studied systems and varied between -48.5 and -52.7 kJ/mol. The thermochemical values for each system correspond to a mixture of the α and β anomeric forms of monosaccharide structures involved in their cationized complexes.
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, 01-224, Warsaw, Poland. wincel@ichf.edu.pl
authors.forename: Henryk
authors.initials: H
authors.lastname: Wincel
mesh_terms: D002412:Cations / Q000737:chemistry; D005740:Gases / Q000737:chemistry; D016018:Least-Squares Analysis; D009005:Monosaccharides / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry*; D011312:Pressure; D012964:Sodium / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D005740:Gases; D009005:Monosaccharides; D014867:Water; D012964:Sodium; D011188:Potassium