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The three‐dimensional hydrogen‐bonded structures in the ammonium and sodium salt hydrates of 4‐aminophenylarsonic acid
Author(s) -
Smith Graham,
Wermuth Urs D.
Publication year - 2014
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229614014867
Subject(s) - chemistry , hydrogen bond , denticity , salt (chemistry) , molecule , crystallography , ammonium , acceptor , coordination polymer , sodium , amine gas treating , ligand (biochemistry) , inorganic chemistry , crystal structure , stereochemistry , organic chemistry , biochemistry , physics , receptor , condensed matter physics
The structures of two hydrated salts of 4‐aminophenylarsonic acid ( p ‐arsanilic acid), namely ammonium 4‐aminophenylarsonate monohydrate, NH 4 + ·C 6 H 7 AsNO 3 − ·H 2 O, (I), and the one‐dimensional coordination polymer catena ‐poly[[(4‐aminophenylarsonato‐κ O )diaquasodium]‐μ‐aqua], [Na(C 6 H 7 AsNO 3 )(H 2 O) 3 ] n , (II), have been determined. In the structure of the ammonium salt, (I), the ammonium cations, arsonate anions and water molecules interact through inter‐species N—H...O and arsonate and water O—H...O hydrogen bonds, giving the common two‐dimensional layers lying parallel to (010). These layers are extended into three dimensions through bridging hydrogen‐bonding interactions involving the para ‐amine group acting both as a donor and an acceptor. In the structure of the sodium salt, (II), the Na + cation is coordinated by five O‐atom donors, one from a single monodentate arsonate ligand, two from monodentate water molecules and two from bridging water molecules, giving a very distorted square‐pyramidal coordination environment. The water bridges generate one‐dimensional chains extending along c and extensive interchain O—H...O and N—H...O hydrogen‐bonding interactions link these chains, giving an overall three‐dimensional structure. The two structures reported here are the first reported examples of salts of p ‐arsanilic acid.