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In the title compound, C13H13NO3, the conformation across the C=C bond is synperiplanar, the torsion angle of the segment C(ring)—C=C—C(N) being 3.2 (5)°. In the crystal, mol­ecules are linked into inversion dimers, arranged in a zigzag pattern, through two C—H...O inter­actions generating R22(10) and R22(14) motifs. These dimers are arranged in a zigzag pattern in the crystal structure. The mol­ecules are further linked along the c axis through weak C—H...π inter­actions, and weak π...π inter­actions [centroid–centroid separation = 3.9986 (17) Å] are also observed.

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In the title compound, C15H15NO4S, the dihedral angle between the benzene rings is 78.62 (16)°. In the crystal, adjacent mol­ecules are linked along the c axis into C(4) chains through strong N—H...O hydrogen bonds. Mol­ecules are further connected through C—H...O hydrogen bonds into a hexa­meric unit generating an R66(66) motif. Another C—H...O inter­action connects the mol­ecules along the c axis, forming C(5) chains. A region of disordered electron density, most probably disordered methanol–water solvent mol­ecules, was treated with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. The formula mass and unit-cell characteristics do not take into account this disordered solvent.

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In the title compound, C10H5F5O2, the C=O bonds are syn to one another. In the crystal, mol­ecules are linked into C(9) chains parallel to [101] through weak C—H...O inter­actions, with the O atom adjacent to the –CF3 group acting as the acceptor.

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The title compound, C14H12ClNO4S, crystallizes with two mol­ecules in the asymmetric unit. The dihedral angles between the benzene rings are 89.68 (1) (mol­ecule 1) and 82.9 (1)° (mol­ecule 2). In each mol­ecule, intra­molecular N—H...O hydrogen bonds between the amide H atom and the meth­oxy O atom generate S(6) loops. In the crystal, mol­ecule 2 is linked into inversion dimers through pairs of C—H...O inter­actions, forming an R22(8) ring motif. Mol­ecules 1 and 2 are further linked along the b-axis direction through C—H...π inter­actions. The crystal structure is further stabilized by several π–π stacking inter­actions [centroid–centroid separations = 3.7793 (1), 3.6697 (1) and 3.6958 (1) Å], thus generating a three-dimensional architecture.

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In the title compound, C15H13F3N2O2·H2O, the dihedral angle between the benzene and pyridine rings is 74.97 (1)°. The –CF3 group attached to the benzene ring is syn to the C=O bond in the adjacent side chain. In the crystal, mol­ecules are linked to one another through the water mol­ecules by strong N—H...O, O—H...O and O—H...N hydrogen bonds, forming a ladder-type network. The benzamide mol­ecules are also linked to one another through C—H...F inter­actions, forming C(6) chains parallel to the b-axis direction. Aromatic π–π stacking inter­actions [centroid–centroid separations = 3.7150 (1) and 3.7857 (1) Å] between adjacent pairs of pyridine and benzene rings are also observed, resulting in a three-dimensional architecture are also observed.
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