Crystal structure of sodium hydrogen malonate

Abstract

Crystals of sodium hydrogen malonate are monoclinic, space group P2₁/c, Z= 4, with a= 6·664(1), b= 7·522(1), c= 9·337(1)Å, and β= 100·69(1)°. The structure was solved from diffractometer data by the heavy-atom method, and refined to R 0·06 (1005 reflections) by the block-diagonal least-squares technique.

A short unsymmetrical hydrogen bond [2·556(3)Å] links the hydrogen malonate residues into infinite chains. The un-ionized and ionized carboxy-groups are twisted, with respect to the plane of the central carbon, atoms, by 73·8 and 131·4°, and mutually are inclined at 61·4°.