
TY  - JOUR
A1  - Kennard, CHL 
A1  - Smith, G 
A1  - Katekar, GF 
T1  - Crystal structure of 9-Oxofluorene-4-carboxylic acid
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1981
VL  - 34
IS  - 5
SP  - 1143
EP  - 1146
KW  - 
UR  - https://doi.org/10.1071/CH9811143 
N2  - 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. 
ER  -

