Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Structure determination from Powder X-ray Diffraction Data of a new polymorph of a high-density organic hydrate material, with an assessment of Hydrogen-Bond Disorder by Rietveld Refinement

Lim, Gin Keat, Fujii, Kotaro, Harris, Kenneth David Mclean and Apperley, David C. 2011. Structure determination from Powder X-ray Diffraction Data of a new polymorph of a high-density organic hydrate material, with an assessment of Hydrogen-Bond Disorder by Rietveld Refinement. Crystal Growth and Design 11 (12) , pp. 5192-5199. 10.1021/cg201230k

Full text not available from this repository.

Abstract

The structural properties of a new polymorph of a material distributed commercially as “hexaketocyclohexane octahydrate” have been determined directly from powder X-ray diffraction data, employing the direct-space genetic algorithm technique for structure solution followed by Rietveld refinement. It is shown that the molecule actually present in the crystal structure is dodecahydroxycyclohexane (C6(OH)12) rather than hexaketocyclohexane (C6O6). This assignment is also confirmed from high-resolution solid-state 13C NMR data. The crystal structure contains two molecules of water per molecule of C6(OH)12. In the asymmetric unit, there are 16 hydrogen-bond donor groups (O–H bonds) and 14 hydrogen-bond acceptors (oxygen atoms), leading to multiple permutations for intermolecular hydrogen-bonding arrangements. Detailed analysis of the results from Rietveld refinement suggests that a disordered model provides the most appropriate description of the hydrogen-bonding arrangement, in which the hydrogen atom of each OH group of C6(OH)12 and the hydrogen atoms of each water molecule are distributed among several different intermolecular O–H···O hydrogen bonds. The density of this material (1.926 g cm–3 at ambient temperature) is one of the highest ever reported densities among organic materials that contain no elements heavier than oxygen.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 1528-7483
Last Modified: 04 Jun 2017 03:10
URI: http://orca.cf.ac.uk/id/eprint/17668

Citation Data

Cited 7 times in Google Scholar. View in Google Scholar

Cited 13 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item