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Metal ion binding by amino acids. The crystal structure of racemic magnesium bis(hydrogen aspartate) tetrahydrate Mg( L ‐AspH) ( D ‐AspH) · 4 H 2 O
Author(s) -
Schmidbaur Hubert,
Bach Ina,
Wilkinson Dallas L.,
Müller Gerhard
Publication year - 1989
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19891220811
Subject(s) - chemistry , tetrahydrate , magnesium , carboxylate , racemization , crystal structure , monoclinic crystal system , crystallography , aspartic acid , octahedron , molecule , metal , inorganic chemistry , hydrogen , hydrogen bond , stereochemistry , medicinal chemistry , amino acid , organic chemistry , biochemistry
Magnesium hydrogen L ‐aspartate hydrogen D ‐aspartate tetrahydrate Mg( D ‐AspH)( L ‐AspH) · 4 H 2 O crystallizes on cooling from the reaction mixture obtained from equivalent quantities of racemic aspartic acid and magnesium hydroxide in water under reflux conditions. The same product is also formed by slow racemization in analogous experiments carried out with pure L ‐aspartic acid. – The compound crystallizes in the monoclinic space group P 2 1 / c with centrosymmetric complex units, in which magnesium is in an octahedral environment of four water oxygen atoms in the equatorial plane and two β‐carboxylate oxygen atoms in axial positions. The NH 3 + and α‐CO 2 −functions form a hydrogen‐bonded system integrating the individual molecules into a three‐dimensional network.