
%0 Journal Article
%A Byriel, KA 
%A Lynch, DE 
%A Smith, G 
%A Kennard, CHL 
%T Molecular Cocrystals of Carboxylic-Acids. V. The Crystal-Structures of (2-Carboxy-phenoxy)acetic Acid and Its 1 : 1 Adduct With 4-Aminobenzoic Acid
%J Australian Journal of Chemistry
%D 1991/10/01
%V 44
%N 10
%P 1459-1464
%K 
%R https://doi.org/10.1071/CH9911459
%U https://www.publish.csiro.au/paper/CH9911459 
%X The crystal structures of (2-carboxyphenoxy)acetic acid (cpaa) (1) and its 1 : 1 adduct [( cpaa )(4-aba)] (2) with 4-aminobenzoic acid have been determined by X-ray diffraction and refined to residuals R 0.077, (1), and 0.051, (2), for 783 and 1062 observed reflections, respectively. The dicarboxylic acid (1) is extended into a one-dimensional zig-zag polymer by hydrogen bonding through the two acid groups [O&#8230;O, 2.67(1)&#506;]. The adduct (2) represents the first example of a phenoxyalkanoic involved in a hetero-dimer association through the conventional cyclic hydrogen-bonding system [O&#8230;O, 2.54, 2.68(1)&#506;]. The 2-carboxy group is also weakly hydrogen bonded to the 4-amino group of (4-aba) [O&#8230;N, 2.99(1)&#506;], and in both (1) and (2) it has an intramolecular hydrogen bond to the ether oxygen of the oxyacetic acid side chain. 
