organic compounds
Acta Crystallographica Section C
Crystal Structure
Communications
Compound (I) crystallizes as a nonmerohedral twin. The
molecule is nearly planar, as shown by the key torsion angles
(Table 1), while the dihedral angle between the mean planes of
the two aryl rings is only 4.4 (2)ꢀ. By contrast, in compounds
(II) (Cobo et al., 2005) and (III) (Cobo et al., 2006), which are
isomorphous and isostructural, the aryl ring is twisted out of
the plane of the rest of the molecule by ca 38ꢀ in each case. On
the other hand, in compound (IV) (Cobo et al., 2009), which
ISSN 0108-2701
(E)-2-(1,3-Benzothiazol-2-yl)-3-(4-
fluorophenyl)acrylonitrile: a chain
of p-stacked hydrogen-bonded rings
a
a
b
´
Jorge Trilleras, Kelly Velasquez, Justo Cobo and
Christopher Glidewellc*
a
´
´
´
Grupo de Investigacion en Compuestos Heterocıclicos, Programa de Quımica,
´
´
´
Facultad de Ciencias Basicas, Universidad del Atlantico, Km 7 Antigua vıa Puerto
b
´
´
Colombia, Barranquilla, Colombia, Departamento de Quımica Inorganica y
Organica, Universidad de Jaen, 23071 Jaen, Spain, and cSchool of Chemistry,
´
´
´
University of St Andrews, Fife KY16 9ST, Scotland
Received 14 May 2013
Accepted 14 May 2013
The title compound, C16H9FN2S, crystallizes as a nonmerohe-
dral twin with twin rotation about the reciprocal-lattice vector
[101]*. The molecules are nearly planar and the dihedral angle
between the planes of the two aryl rings is only 4.4 (2)ꢀ. The
molecules are linked by pairs of C—Hꢁ ꢁ ꢁN hydrogen bonds to
form cyclic centrosymmetric R22(18) dimers, which are linked
into chains by an aromatic ꢀ–ꢀ stacking interaction. Com-
parisons are made with some related 3-aryl-2-thienylacrylo-
nitriles.
contains both fully ordered molecules and fourfold disordered
molecules resulting in a Z0 value of 0.75 in the space group
C2/m, the non-H atoms of the ordered molecules all lie on
mirror planes, while those of the disordered molecule are
coplanar within experimental uncertainty, although not
constrained to be so by symmetry. Similarly, the non-H atoms
of compound (V) (Cobo et al., 2006) are, apart from the
methyl C atom of the 4-methoxy substituent, very nearly
coplanar. No obvious simple explanation presents itself for
Comment
Acetonitrile derivatives are useful and versatile precursors for
the synthesis of heterocyclic molecules having potential
biological activity; in particular they provide a useful route to
acrylonitrile derivatives. Although such derivatives are, in
general, easy to synthesize, a wide diversity of methods is
available, utilizing both conventional thermal reactions and
those mediated by microwave irradiation (Quiroga et al., 2000,
2001; Dawood et al., 2010). While Knoevenagel-type products
can be obtained under conventional thermal conditions in the
presence of catalytic quantities of base, giving yields in the
good to very low range, the corresponding condensation
reactions conducted in solvent-free systems under microwave
irradiation generally give better yields in much reduced
reaction times (Lenarda˜o et al., 2007). We have now prepared
the title compound, (E)-2-(1,3-benzothiazol-2-yl)-3-(4-fluoro-
phenyl)acrylonitrile, (I), using the microwave induced con-
densation reaction between 2-(1,3-benzothiazol-2-yl)aceto-
nitrile and 4-fluorobenzaldehyde under solvent-free condi-
tions, which provided a satisfactory yield in a very short
reaction time under environmentally friendly conditions, and
we report here the molecular and supramolecular structure of
compound (I) (Fig. 1), which we compare with the analogues
(II)–(V) (Cobo et al., 2005, 2006, 2009) (see Scheme).
Figure 1
The molecular structure of compound (I), showing the atom-labelling
scheme. Displacement ellipsoids are drawn at the 30% probability level.
Acta Cryst. (2013). C69, 671–673
doi:10.1107/S0108270113013267
# 2013 International Union of Crystallography 671