Acta Cryst. (2005). B61, 185-191 [ doi:10.1107/S0108768105000455 ]
![[alpha]](/logos/entities/alpha_rmgif.gif)
-lactose from X-ray powder diffractionAbstract: The stable anhydrous form of -lactose has been obtained by the dehydration of -lactose monohydrate in methanol. An X-ray powder diffraction pattern was recorded at room temperature with a laboratory diffractometer equipped with an INEL curved sensitive detector CPS120. The starting structural model of this form was found by a Monte-Carlo simulated annealing method. The structure was obtained through Rietveld refinements and the minimization of crystalline energy for the localization of the H atoms of the hydroxyl groups. Soft restraints were applied to bond lengths and angles. Networks of O-H
O hydrogen bonds account for the crystalline cohesion. A comparison is made between the hydrogen-bond networks of this form and those of the monohydrate and hygroscopic anhydrous forms of -lactose.
Keywords: X-ray powder diffraction; crystalline energy; Monte-Carlo simulated anealing method.
 |   Portable Document Format (PDF) file (19.2 kbytes) |
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.
Copyright © International Union of Crystallography
IUCr Webmaster