
%0 Journal Article
%A Smith, G 
%A Kennard, CL 
%A White, A 
%T Herbicides. II. Crystal Structure of 2,4,5-T (2,4,5-Trichlorophenoxyacetic Acid)
%J Australian Journal of Chemistry
%D 1976/12/01
%V 29
%N 12
%P 2727-2730
%K 
%R https://doi.org/10.1071/CH9762727
%U https://www.publish.csiro.au/paper/CH9762727 
%X The crystal structure of 2,4,5-T was determined by the symbolic addition method. 1741 reflections, of which 1326 were considered observed, were collected on a four-circle diffractometer. Crystals are triclinic, P&#299;, with z = 2, in a cell of dimensions: a 1089.5(6), b 684.8(3), c 683.8(3) pm, &#945; 81.33(4)°, &#946; 78.90(4)°, &#947; 83.04(4)°. The structure was refined by least squares to R 0.068. The two molecules are hydrogen-bonded [O...H-O 268.9(7) pm] through their carboxylic acid groups forming a cyclic dimer in a similar manner to 2,4- dichlorophenoxyacetic acid (2,4-D).1 However, the planes of the benzene ring and the carboxyl group are 4.15° away from being coplanar, a fact which is markedly different from that observed in 2,4-D (85.23°) but similar to that observed in the substituted aromatic carboxylic acids. The result of this is a dimer with all atoms except those in the methylene group lying approximately in a plane. 
