Crystal structures of the acid salts of some dibasic acids. Part VI. An X-ray study of potassium hydrogen glutarate

Abstract

The title compound crystallises with Z= 4 in a cell with a= 18·476(4), b= 7·282(3), c= 5·133(1)Å, space group Cmma. The structure has been refined to R 3·35% for 627 independent, non-zero reflexions obtained from diffractometer measurements. It embodies infinite chains of glutarate residues (of mm symmetry) linked end-to-end by hydrogen bonds across points of 2/m symmetry. The hydrogen bonds are very short, with O ⋯ H ⋯ O 2·445(3)Å. The vibrational movements of the glutarate residue are analysed. The librational component is large in the one direction where it is unconstrained by the hydrogen bonding, and negligibly small in the other two directions.