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

Acta Crystallographica Section E: Crystallographic Communications

Lynch, D.E.¹  Smith, G.² 

[1] Exilica Ltd., The Technocentre, Puma Way, Coventry CV1 2TT, England;Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia

关键词: CRYSTAL STRUCTURE;    MORPHOLINE SALTS;    PHENOXYACETIC ACIDS;    HERBICIDES;    2,4-D;    3,5-D;    HYDROGEN BONDING;   

DOI  :  10.1107/S2056989015019842

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The anhydrous salts morpholinium (tetra­hydro-2-H-1,4-oxazin-4-ium) phen­oxy­acetate, C4H10NO+·C8H7O3−, (I), morpholinium (4-fluoro­phen­oxy)acetate, C4H10NO+·C8H6 FO3−, (II), and isomeric morpholinium (3,5-di­chloro­phen­oxy)acetate (3,5-D), (III), and morpholinium (2,4-di­chloro­phen­oxy)acetic acid (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′ R12(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⋯Ocarbox­yl 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 R42(8)], giving a cyclic hetero­tetra­meric structure.

【 授权许可】

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