The crystal structure of the mono-potassium salt of l-aspartic acid dihydrate

T. G. Evans and R. Hine


The salt crystallizes in the space group P21212 with four molecules of NH2, · CH · COOH · CH2 · COO · K · 2H2O in a unit cell of dimensions a = 24.56 Å, b = 6.93 Å and c = 4.99 Å. The structure has been solved by the heavy-atom method and refined by Fourier and least-squares methods. The structure is held together by a system of ionic and hydrogen bonds. Each potassium ion is coordinated by seven oxygen atoms, at distances between 2.68 Å and 3.19 Å and forming an irregular truncated octahedron. Each water molecule is at the centre of a roughly tetrahedral or trigonal arrangement of hydrogen bonds and electrostatic contacts.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.