Open AccessThe crystal structure of ammonia monohydrate
Author(s) -
Olovsson I.,
Templeton D. H.
Publication year - 1959
Publication title -
acta crystallographica
Language(s) - English
Resource type - Journals
ISSN - 0365-110X
DOI - 10.1107/s0365110x59002419
Subject(s) - orthorhombic crystal system , hydrogen bond , crystallography , molecule , crystal structure , ammonia , crystal (programming language) , chemistry , materials science , organic chemistry , computer science , programming language
The crystal structure of ammonia monohydrate, NH 3 . H20, has been determined from three-dimensional X-ray data. Exposures at 9 5 and -160 °C. indicate the same structure. The crystals are orthorhombic (space group P212121) with four molecules in a unit cell of dimensions: a--4.51 + 0"01, b =5-587 +0"003, e=9-700+0"005 A at 1 6 0 °C. The structure contains planar chains of water molecules connected by hydrogen bonds of 2-76 A. The chains are crosslinked by the ammonia molecules into a three-dimensional network by short bonds (2-78 A) of the type O-H • • • N and long bonds (3.21, 3-26, 3.29 A) of the type O • • • H-N.