Figure 24.3.3.6

Allen, F. H.; Hoy, V. J.

doi:10.1107/97809553602060000720

International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

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International Tables for Crystallography (2006). Vol. F. ch. 24.3, p. 668

Figure 24.3.3.6

F. H. Allen^a ^* and V. J. Hoy^a

^a Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
Correspondence e-mail: allen@ccdc.cam.ac.uk

Figure 24.3.3.6

A Vista polar scatterplot of THETA versus PHI, the angles that define the direction of approach of the donor H atom to the >C=O plane. There are clear indications of lone-pair directionality: H prefers an in-plane approach to O (THETA = 0°), with preferred PHI values in the range 120–135°.