The crystal and molecular structure of e-glycine by neutron diffraction was determined simultaneously by the authors and by J6nsson & Kvick [Acta Cryst. (1972), B28, 1827-1833. As the two determinations were of comparable precision, a detailed comparative study was undertaken. The comparison indicates that the derived parameters probably do not belong to the same population, whereas the intensity data sets have been shown to belong to the same population. Reasons for the statistical variations between the derived parameter sets have been investigated.
The crystal structure of NN'-disalicylidene-ethylenediaminezinc(l1) monohydrate has been determined by twodimensional X-ray methods. The molecule adopts a 5-co-ordinate pyramidal configuration, similar to that of related copper complexes, by co-ordination of the water molecule.
An accurate set of X-ray data collected at 298 K was used to refine the structure and study the deformation density of the title compound for 5007 reflections. A neutron structure confirmed the accuracy of bond lengths reported in an earlier determination. The radial structure of the deformation density near the Cu atom also varies, in a manner correlated with metal-oxygen bond length, and consistent with trends in the isomorphous magnesium and nickel structures. Large differences in bond lengths affected by Jahn-Teller distortion are influenced by interactions with neighbouring groups. The strengths of the metal-oxygen bonds are increased by hydrogen bonding of the ligating water molecules, and decreased by interaction between the oxygen lone pairs and the ammonium group.
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