(E)-1-Phenylethanone semicarbazone

(E)-1-Phenylethanone semicarbazone

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In the title compound, C9H11N3O, the benzene ring is disordered over two positions with refined occupancies of 0.922 (5) and u11-200ps 0.078 (5).

The program PLATON [Spek (2009).Acta Cryst.D65, 148–155] recommends the solution in the space group C2/m with a = 7.

3050 (3), b = 6.6745 (2), c = 18.3853 (6) Å and β = 96.

986 (2)°.However, the large number of non-extinct reflections needed to be ignored if C2/m is chosen suggested that the space group is incorrect, even though the R values are lower than that for P21/c.The semicarbazone group is essentially planar, with a maximum deviation of 0.

046 (1) Å for one of the N atoms.The mean plane of the semicarbazone group forms dihedral angles of 33.61 (8) and 39.

1 (9)° with the synovex one grass benzene ring of the major and minor components, respectively.In the crystal structure, molecules are linked by intermolecular N—H.O hydrogen bonds into extended chains along the c axis.

The crystal structure is further stabilized by weak intermolucular C—H.π interactions.