Crystal structure of 9-Oxofluorene-4-carboxylic acid
1981; CSIRO Publishing; Volume: 34; Issue: 5 Linguagem: Inglês
10.1071/ch9811143
ISSN1445-0038
AutoresCHL Kennard, Gregory P. Smith, GF Katekar,
Tópico(s)Chemical Synthesis and Analysis
ResumoThe crystal structure of 9-oxofluorene-4-carboxylic acid has been determined by direct methods using three-dimensional X-ray diffraction data, and refined to R0·068 for 1323 'observed' reflections. Crystals are monoclinic, space group P21/c with 24 in a cell of dimensions a 3·843(3), b 7·986(5), c 3269(2) �, β 96·64(4)�. The molecules form centrosymmetric hydrogen-bonded cyclic dimers [O···O 2·642(3) �] with the plane of the carboxylic acid making an angle of 26·5� with that of the 9-oxofluorene group. Stacks of molecules form down the a axis with 3.843 �. separation.
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