title: Crystal structures and thermotropic properties of alkyl alpha-D-glucopyranosides and their hydrates.
abstract: Thermotropic properties and crystal structures of alkyl alpha-D-glucopyranosides and their hydrates were estimated by X-ray, DSC and thermogravimetric measurements (TGA). Monohydrates rapidly lose their crystal water several degrees below the melting point of the anhydrous glucopyranosides. The melting points of the monohydrates measured in DSC pressure cells (chain length longer than seven) are lower, and the clearing points higher than those of the anhydrous glucosides. Layer distances of smectic and crystalline phases of anhydrous compounds were established. Melting points, densities and layer distances of the crystalline anhydrous glucopyranosides display strong even-odd effects. The strong decrease of these effects in the case of the monohydrates can be elucidated by the results of X-ray crystal structure analysis.
authors.affiliation: Department of Physical Chemistry I, University of Bayreuth, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Hoffmann
authors.forename: W
authors.initials: W
authors.lastname: Milius
authors.forename: G
authors.initials: G
authors.lastname: Voss
authors.forename: M
authors.initials: M
authors.lastname: Wunschel
authors.forename: S
authors.initials: S
authors.lastname: van Smaalen
authors.forename: S
authors.initials: S
authors.lastname: Diele
authors.forename: G
authors.initials: G
authors.lastname: Platz
mesh_terms: D002152:Calorimetry, Differential Scanning; D018360:Crystallography, X-Ray; D005960:Glucosides / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D013696:Temperature
chemical_list: D005960:Glucosides