Issue 86, 2004

The crystal structure of an unstable polymorph of β-d-allose

Abstract

The crystal structure of a new polymorph, Form II, of β-D-allose has been determined by X-ray powder diffraction. The unit cell is hexagonal, a = b = 16.598 Å, c = 4.856 Å, α = β = 90°, γ = 120°, space group P62 with Z = 6, Z′ = 1. The molecule adopts the 4C1 chair-conformation, with a torsional change of conformation of the O6 side-chain compared to the orthorhombic Form I. The two polymorphs share a common feature of a stacked hydrogen bonded column of molecules in the short axis direction. The structures differ in hydrogen linking of these columns. The more stable Form I has more immediate neighbours linked by hydrogen bonds to a reference molecule, and higher crystal density than Form II.

Graphical abstract: The crystal structure of an unstable polymorph of β-d-allose

Article information

Article type
Paper
Submitted
24 Aug 2004
Accepted
28 Sep 2004
First published
12 Oct 2004

CrystEngComm, 2004,6, 535-539

The crystal structure of an unstable polymorph of β-D-allose

P. A. Bonnet, J. van de Streek, A. V. Trask, W. D. S. Motherwell and W. Jones, CrystEngComm, 2004, 6, 535 DOI: 10.1039/B412962H

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