C-H … O hydrogen bonding and the deliberate design of organic crystal structures

Desiraju, Gautam R. (1992) C-H … O hydrogen bonding and the deliberate design of organic crystal structures Molecular Crystals and Liquid Crystals, 211 . pp. 63-74. ISSN 1542-1406

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Related URL: http://dx.doi.org/10.1080/10587259208025806


The C-H…O interaction, though weak, is not van deer Wails in nature but electrostatic and resembles O-H…O and N-H…O hydrogen bonds in its geometrical properties. Spectroscopic evidence hints at some degree of covalent bonding between H and 0 atoms. The long-range, electrostatic character of the C-H…O interaction determines its important role in crystal engineering. Planar aromatic hydrocarbons adopt herringbone structures but if a critical number of O atoms is present, a planar molecule will cross the structural threshold from a C…H stabilised herringbone structure to a C-H…O stabilised layer structure wherein adjacent molecules are parallel and highly overlapped. These ideas have been used to design a family of crystal structures of alkoxyphenylpro-piolic acids that participate in an intermolecular, solid state Diels-Alder reaction. When the number of C-H…O interactions in a structure is unusually large or small, there is a possibility of distortions in the O-H…O network.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Group.
Keywords:C-H...O Hydrogen Bonds; Crystal Engineering; Intermolecular Interactions; Cambridge Structural Database; Infrared Spectroscopy; Crystal Packing
ID Code:10919
Deposited On:09 Nov 2010 04:30
Last Modified:16 May 2016 20:26

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