Crystal structures and hydrogen bonding in the morpholinium salts of four phenoxyacetic acid analogues

Smith, Graham & Lynch, Daniel E. (2015) Crystal structures and hydrogen bonding in the morpholinium salts of four phenoxyacetic acid analogues. Acta Crystallographica Section E: Crystallographic Communications, E71, pp. 1392-1396.

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Abstract

The anhydrous salts morpholinium (tetrahydro-2-H-1,4-oxazine) phenxyacetate, C4H10NO+ C8H7O3- (I), (4-fluorophenoxy)acetate, C4H10NO+ C8H6FO3- (II) and isomeric morpholinium (3,5-dichlorophenoxy)acetate (3,5-D) (III) and morpholinium (2,4-dichlorophenoxy)acetate (2,4-D), C4H10NO+ C8H5Cl2O3- (IV), have been determined and their hydrogen-bonded structures are described. In the crystals of (I), (III) and (IV), one of the the aminium H atoms is involved in a three-centre asymmetric cation-anion N-H...O,O' R2/1(4) hydrogen-bonding interaction with the two carboxyl O-atom acceptors of the anion. With the structure of (II), the primary N---H...O interaction is linear. In the structures of (I), (II) and (III), the second N-H...O(carboxyl) hydrogen bond generates one-dimensional chain structures extending in all cases along [100]. With (IV), the ion pairs are linked though inversion-related N-H...O hydrogen bonds [graph set R2/4(8)], giving a cyclic heterotetrameric structure.

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ID Code: 89669
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: morpholinium salt, phenoxyacetic acids, hydrogen bonding, crystal structure, herbicides
DOI: 10.1107/S2056989015019842
ISSN: 2056-9890
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 International Union of Crystallography
Copyright Statement: This open-access article is distributed under the terms of the Creative Commons Attribution Licence http://creativecommons.org/licenses/by/2.0/uk/legalcode, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Deposited On: 30 Oct 2015 00:01
Last Modified: 05 Nov 2015 23:44

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