Crystal structure of DL-ornithine hydrobromide

Abstract

Crystals of DL-ornithine hydrobromide are monoclinic, a= 12·18, b= 7·88, c= 11·61 Å, β= 133° 39′, Z= 4, space group P2₁/c. The structure was determined with Cu-K_α photographic data by Patterson and electron-density methods, and refined by least-squares methods, to R 0·13 for 1559 reflexions. The ornithine molecule is a zwitterion, with both nitrogen atoms accepting protons. The mean bond distances are C–O 1·249, C–N 1·469, and C–C 1·532 Å. The structure is held together by a system of N–H ⋯ O (2·84, 2·84, and 2·89 Å) and N–H ⋯ Br (3·29, 3·36, and 3·46 Å) hydrogen bonds.