
%0 Journal Article
%A Kennard, CHL 
%A Smith, G 
%A Katekar, GF 
%T Crystal structure of 9-Oxofluorene-4-carboxylic acid
%J Australian Journal of Chemistry
%D 1981/05/01
%V 34
%N 5
%P 1143-1146
%K 
%R https://doi.org/10.1071/CH9811143
%U https://www.publish.csiro.au/paper/CH9811143 
%X The crystal structure of 9-oxofluorene-4-carboxylic acid has been determined by direct methods using three-dimensional X-ray diffraction data, and refined to R0&#903;068 for 1323 'observed' reflections. Crystals are monoclinic, space group P21/c with 24 in a cell of dimensions a 3&#903;843(3), b 7&#903;986(5), c 3269(2) Å, &#946; 96&#903;64(4)º. The molecules form centrosymmetric hydrogen-bonded cyclic dimers [O&#903;&#903;&#903;O 2&#903;642(3) Å] with the plane of the carboxylic acid making an angle of 26&#903;5º with that of the 9-oxofluorene group. Stacks of molecules form down the a axis with 3.843 Å. separation. 
