M. Haisa, S. Kashino, T. Yuasa
May 15, 1976
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Influential Citations
23
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Journal
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
Abstract
The crystal structure of p-aminoacetophenone has been determined from visually-estimated X-ray diffraction data. The crystals are monoclinic, space group P21/a, with cell dimensions of a= 17.63 (2), b=5"18 (1), c=8.51 (1) A, ,8= 106.6 (2) ° and Z=4 . The final R value was 0.073 for 950 non-zero reflexions. The molecule is nearly planar, and the benzene ring takes a quinonoid form. The carbonyl O atom deviates by 0.128 A from the plane of the benzene ring. The molecules related by a twofold screw axis are linked by a N-H. • • N hydrogen bond (3.217 ,A,) to form a chain along the b axis. The chains are held together by a N-H. • • O hydrogen bond (2.905 A) between the molecules related by a c-translation to form a sheet parallel to the bc plane. The sheets are stacked by van der Waals forces at a spacing of 3.46 A. The structure is similar to that of p-aminobenzamide.