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The asymmetric unit of the title compound, C11H10ClN3O, contains two geometrically different mol­ecules, A and B, in both of which the pyridazine rings are essentially planar with r.m.s. deviations of 0.0137 and 0.0056Å, respectively. In mol­ecule A, the dihedral angle between the pyridazine and benzene rings is 6.5 (2)°, whereas in mol­ecule B it is 27.93 (7)°. In mol­ecule B, an intramolecular N—H...O hydrogen bond forms an S(5) ring motif. In both molecules, S(6) ring motifs are present due to non-classical C—H...N hydrogen bonds. The π–π inter­actions between the pyridazine rings of A mol­ecules [3.4740 (13) Å] and B mol­ecules [3.4786 (17) Å] have very similar centroid–centroid separations. π–π Inter­actions also occur between the benzene rings of B mol­ecules with a centroid–centroid separation of 3.676 (2) Å and a slippage of 1.02 Å. In the crystal, the mol­ecules are linked into chains extending along [010] by C—H...N and C—H...Cl interactions.

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In the title compound, C9H9N3O3S, the benzene ring and the N-carbamothio­ylacetamide unit are oriented at a dihedral angle of 54.82 (4)°. The dihedral angle between the ring and its attached nitro group is 28.54 (12)°. An intra­molecular, bifurcated N—H...(O,O) hydrogen bond generates two S(6) rings. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds generate R22(8) loops. Weak C—H...O inter­actions link the dimers.

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In the title compound, C17H18N2O3S, the dihedral angles between the thio­phene ring and the ethyl ester group and the pyridine-4-carboxamide unit are 7.1 (2) and 9.47 (11)°, respectively. An intra­molecular N—H...O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds between the tetra­hydro-1-benzothio­phene and the pyridine-4-carboxamide residues generate R22(16) loops. There exists positional disorder in three methelene groups of the cyclo­hexane ring and the terminal C atom of the ethyl ester side chain in a 0.691 (14):0.309 (14) occupancy ratio.

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In the title compound, C13H17NO3S, the dihedral angles between the thio­phene ring and the ethyl ester and acetamide groups are 5.21 (13) and 10.06 (16)°, respectively. The cyclo­hezene ring adopts a half-chair conformation. An S(6) ring is formed due to an intra­molecular N—H...O hydrogen bond. In the crystal, mol­ecules are linked by C—H...O inter­actions between the tetra­hydro-1-benzothio­phene unit and the ethyl ester group, forming C(7) chains propagating along the b-axis direction.

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In the title compound, C20H17N3O4, the dihedral angles between the heterocyclic ring and the toluene and nitro­benzene rings are 4.21 (15) and 11.43 (14)°, respectively. The whole mol­ecule is close to planar (r.m.s. deviation for the 27 non-H atoms = 0.171 Å). Two S(6) rings are formed due to intra­molecular C—H...O and O—H...O hydrogen bonds. In the crystal, inversion dimers linked by pairs of C—H...O bonds generate R22(10) loops and further C—H...O bonds link the dimers along the b-axis direction. There exist π–π inter­actions between the heterocyclic rings at a centroid–centroid distance of 3.7126 (10) Å and between the centroids of the benzene rings at a distance of 3.8710 (16) Å.
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