
%0 Journal Article
%A Smith, G 
%A Oreilly, EJ 
%A See, SA 
%A Byriel, KA 
%A Kennard, CHL 
%T Preparation and Crystal Structure of the Potentially Tridentate Substituted Phenoxyacetic Acid (2-Benzoyl-5-methoxyphenoxy)acetic Acid and Its Complex Adduct With Sodium
%J Australian Journal of Chemistry
%D 1995/04/01
%V 48
%N 4
%P 869-878
%K 
%R https://doi.org/10.1071/CH9950869
%U https://www.publish.csiro.au/paper/CH9950869 
%X The ring-substituted phenoxyacetic acid (2-benzoyl-5-methoxyphenoxy)acetic acid (HL) (3) and its complex adduct dimer (4) with sodium, [Na2(L)2(HL)2].2HL, have been synthesized and their structures determined by X-ray diffraction. The acid (3) does not have the usual cyclic hydrogen-bonded dimer association, but instead has three-centre intramolecular hydrogen bonding between the carboxyl proton and both the ether and keto oxygens [O---O, 2.602(3), 2.711(3) &#506; respectively]. Each sodium in the centrosymmetric complex dimer (4) is seven-coordinate [Na-O, 2.313(5)-2.612(5) &#506;], involving the 'inner' three oxygens of both a protonated and an ionic ligand molecule. In addition, one of these carboxyl oxygens forms a bridge to the inversion-related sodium, while the uncoordinated carboxyl oxygen is hydrogen-bonded to a protonated  carboxy group [O---O, 2.464(8) &#506;]. The molecules of the lattice acid have only one hydrogen-bonded association with the second uncoordinated carboxy group in the dimer [O---O, 2.513(7) &#506;]. 
