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Crystal structures and thermal analyses of alkyl 2-deoxy-alpha-D-arabino-hexopyranosides

Singh, Madan Kumar and Swain, Diptikanta and Row, Tayur N Guru and Jayaraman, Narayanaswamy (2009) Crystal structures and thermal analyses of alkyl 2-deoxy-alpha-D-arabino-hexopyranosides. In: Carbohydrate research, 344 (15). pp. 1993-1998.

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Abstract

The crystal structures of alkyl 2-deoxy-alpha-D-arabino-hexopyranosides, with the alkyl chain lengths from C-8 to C-18, are established by the single crystal X-ray structural determination. The even-alkyl chain length derivatives crystallized orthorhombic, with space group P2(1)2(1)2(1), whereas the odd-alkyl chain length derivatives crystallized monoclinic, with space group P2(1). The sugar moieties retained a C-4(1) chair conformation and the conformation of the alkyl chains was all-trans. The molecules formed a bilayer structure, in which alkyl chains were interdigitated.The hydrogen bonds, originating from the sugar moieties, were observed in adjacent layers and also within the same layer, resulting in the formation of infinite chains. The alkyl chains arranged parallel to each other and formed planar structures. The thermal properties of the alkyl 2-deoxy glucosides were analyzed further. It was observed that none of the derivatives exhibited mesomorphism. This study establishes that the absence of the hydroxyl group at C-2 of the sugar moiety results in a non-mesogenic nature of the alkyl 2-deoxy-alpha-D-glycosides, as opposed to the profound mesogenic nature of the normal alkyl glycosides.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science.
Keywords: 2-Deoxy glycosides; Glycolipids; Hydrogen bonding; Liquid crystals; Solid-state structures
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > Organic Chemistry
Date Deposited: 10 Dec 2009 09:48
Last Modified: 19 Sep 2010 05:52
URI: http://eprints.iisc.ernet.in/id/eprint/24928

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