Crystal structure of caesium hydrogen (L)-aspartate and an overview of crystalline compounds of aspartic acid with inorganic constituents

摘要

The crystal structure of the new polar compound caesium hydrogen (L)-aspartate, Cs(C₄H₆NO₄), (abbreviated: Cs(L -AspH)) was determined from single crystal X-ray diffraction data; it comprises two crystallographically different L -AspH anions that are connected via caesium cations to form a three dimensional framework. The Cs ions are irregularly sevenfold [Cs1O₇] respectively eightfold [Cs2O₈] coordinated to all – and β– carboxylate oxygen atoms. Cs(L -AspH) represents a novel structure type of its own, as do most compounds of (L)-aspartic acid with inorganic constituents. A brief summary of such structurally known aspartates is given. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)