Abstract
The title compound, C
13
H
10
ClNO, (I), is a polymorph of the structure, (II), first reported by Gowda
et al.
[
Acta Cryst.
(2008), E
64
, o462]. In the original report, the compound crystallized in the orthorhombic space group
Pbca
(
Z
= 8), whereas the structure reported here is monoclinic
P
21/
c
(
Z
= 4). The principal difference between the two forms lies in the relative orientations of the phenyl and benzene rings [dihedral angle = 8.90 (13)° for (I) and 61.0 (1)° for (II)]. The inclination of the amide –CONH– units to the benzoyl ring is more similar [15.8 (7)° for (I) and 18.2 (2)° for (II)]. In both forms, the N—H bonds are
anti
to the 3-chloro substituents of the aniline rings. In the crystal, intermolecular N—H⋯O hydrogen bonds form
C
(4) chains along
c
. These chains are bolstered by weak C—H⋯O interactions that generate
R
2
1
(6) and
R
2
1
(7) ring motifs.