The Crystal Structure of Tetramethylenediammonium Chloride

Abstract

Abstract The crystal structure of tetramethylenediam-monium chloride has been determined by the two-dimensional Fourier method. The crystal belongs to the monoclinic system, with a=10.73Å, b=8.35Å, c=4.60Å and β=92.5°, and the space group is P21/a. The tetramethylenediammonium ion has been found to possess a center of symmetry of the unit cell, and the carbon and the nitrogen atoms in the ion, make a coplanar (trans-) zigzag chain. Thus, the tetramethylenediammonium ion has been found to have either a trans- or a gauche-configuration, depending on the structures of the crystals. There are four short approaches between nitrogen and chloride ions with lengths of 3.19∼3.28Å ; three of them have been concluded to be hydrogen bonds. These hydrogen bonds make two-dimensional networks of the ions perpendicular to the c-axis. The structure of this crystal is similar to that of ethylenediam-monium chloride, and some comparisons between them have been given.