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In the title mol-ecule, C15H11Cl2NOS, the dihedral angle between the phenyl and benzene rings is 72.24 (1)°. In the crystal, pairs of N-H⋯S hydrogen bonds form dimers with twofold rotational symmetry. The dimers are connected by weak C-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). An intra-molecular O-H⋯S hydrogen bond is also observed.

In the title mol-ecule, C19H17F3N2O2, the fused cyclo-hexene and pyran rings adopt sofa and flattened boat conformations, respectively. The four essentially planar atoms of the pyran ring [maximum deviation = 0.008 (2) Å] form a dihedral angle of 88.13 (9)° with the benzene ring. The F atoms of the trifluoro-methyl group were refined as disordered over three sets of sites in a 0.507 (7):0.330 (7):0.163 (3) ratio. In the crystal, mol-ecules are connected into inversion dimers via pairs of N-H⋯N hydrogen bonds and these dimers are further linked by N-H⋯O hydrogen bonds into a two-dimensional network parallel to (100).

In the title moleclue, C6H7N3, the mean plane of the dimethyl-amino group [maximum deviation = 0.006 (2) Å] forms a dihedral angle of 7.95 (18)° with the mean plane of the propane-dinitrile fragment [maximum deviation = 0.008 (2) Å]. In the crystal, weak C-H⋯N hydrogen bonds link the mol-ecules into a three-dimensional network.

The asymmetric unit of the title compound, C(25)H(31)NO(4), contains two independent mol-ecules. In one mol-ecule, the benzene ring and an attached meth-oxy group were refined as disordered over two sets of sites in a 0.65 (4): 0.35 (4) ratio. In both mol-ecules, the central ring of the acridinedione system adopts a flattened boat conformation. The four essentially planar atoms of this ring [maximum deviations = 0.006 (5) Å in both mol-ecules] forms dihedral angles of 86.8 (2) and 87.6 (2)°, respectively, with the major and minor components in the disordered benzene ring and 87.3 (2)° with the benzene ring in the fully ordered mol-ecule. The two outer rings of the acridinedione system adopt sofa conformations in both mol-ecules. In the crystal, N-H⋯O hydrogen bonds form two independent chains along [100]. C-H⋯O hydrogen bonds link the chains, forming a three-dimensional network.

In the title mol-ecule, C(17)H(13)FN(2)O(2), the 3,4-dihydro-pyrimidine ring adopts a flattened sofa conformation with the flap atom (which bears the fluoro-phenyl substituent) deviating from the plane defined by the remaining five ring atoms by 0.281 (2) Å. This plane forms dihedral angles of 85.98 (6) and 60.63 (6)° with the 4-fluoro-phenyl and benzoyl-phenyl rings, respectively. The dihedral angle between the 4-fluoro-phenyl group and the benzene ring is 71.78 (6)°. In the crystal, N-H⋯O hydrogen bonds link mol-ecules into inversion dimers that are further connected by another N-H⋯O inter-action into a two-dimensional supra-molecular structure parallel to (101).

In the title mol-ecule, C23H26FNO2, the central ring of the acridinedione system adopts a slight boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.019 (1) Å] form a dihedral angle of 89.98 (6)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules, forming chains along [001].

In the title mol-ecule, C19H18F3N3O, the dihydro-pyridine and cyclo-hexene rings both adopt sofa conformations. The five essentially planar atoms of the dihydro-pyridine ring [maximum deviation = 0.039 (2) Å] form a dihedral angle of 88.19 (8)° with the benzene ring. The F atoms of the trifluoro-methyl group were refined as disordered over two sets of sites in a 0.840 (3):0.160 (3) ratio. In the crystal, N-H⋯O and N-H⋯N hydrogen bonds link mol-ecules into a two-dimensional network parallel to (100).

In the title mol-ecule, C24H29NO4, the central ring of the acridinedione system adopts a flat boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.001 (2) Å] form a dihedral angle of 85.99 (12)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, O-H⋯O and N-H⋯O hydrogen bonds link the mol-ecules, forming a two-dimensional network parallel to (100).

In the title compound, C(7)H(10)N(2)O(2), the dimethyl-amino group is twisted slightly relative to the acrylate fragment, forming a dihedral angle of 11.6 (1)°. In the crystal, molecules are linked via pairs of bifurcated C-H/H⋯O hydrogen bonds, forming inversion dimers, which are further connected by C-H⋯N hydrogen bonds into chains along the a-axis direction.

The title mol-ecule, C(17)H(14)F(3)NO(4), consists of two nearly planar fragments, viz. the 2-benzyl-oxypyridine (r.m.s. deviation 0.016 Å) and (E)-3-meth-oxy-prop2-enoic (r.m.s. deviation 0.004 Å) units, which form a dihedral angle of 84.19 (7)°. In the crystal, pairs of O-H⋯O hydrogen bonds link mol-ecules into dimers that are further connected by C-H⋯O and C-H⋯F inter-actions into (001) layers. In addition, π-π stacking inter-actions are observed within a layer between the pyridine and benzene rings [centroid-centroid distance = 3.768 (2) Å]. The F atoms of the trifluoro-methyl group are disordered over two sets of sites in a 0.53 (4):0.47 (4) ratio.

In the title compound, C(11)H(12)FNO, the dihedral angle between the prop-2-en-1-one group and the benzene ring is 19.33 (6)°. The configuration of the keto group with respect to the olefinic double bond is s-cis. In the crystal, the mol-ecules form dimers through aromatic π-π stacking inter-actions [centroid-centroid distance = 3.667 (1) Å] and are linked via C-H⋯O inter-actions into chains along the b axis.

In the title compound, [Na(C₁₁H₁₁ClN₃O₃)(H₂O)](n), there are two independent Na(I) ions, one of which lies on an inversion center and is coordinated in a slightly distorted octa-hedral environment. The other Na(I) ion lies on a twofold rotation axis and is cooordinated in a slightly distorted trigonal-bipyramidal coordination environment. In the organic ligand, the imidazolidine ring adopts a half-chair conformation. The Na(I) ions bridge organic ligands and water mol-ecules, forming a two-dimensional structure parallel to (100). There are inter-molecular O-H⋯O and weak C-H⋯O hydrogen bonds within the two-dimensional structure.

In the title compound, C(13)H(16)ClN(5)O(4), the imidazole ring is in a slight envelope conformation. The dihedral angle between the pyridine ring and the four essentially planar atoms [maximum deviation 0.015 (2) Å] of the imidazole ring is 80.8 (1)°. In, the crystal, weak C-H⋯O and C-H⋯N hydrogen bonds are present. In addition, there are weak π-π stacking inter-actions between symmetry-related pyridine rings with a centroid-centroid distance of 3.807 (1) Å.

In the title compound, C(12)H(14)ClN(3)O(3), the imidazole ring adopts a half-chair conformation. The dihedral angle between the pyridine and imidazole rings is 70.0 (1)°. In the crystal, the molecules are linked by C-H⋯O inter-actions, forming chains parallel to the c axis.

The title compound, C(9)H(12)ClN(4) (+)·Cl(-), is a natural metabolic product of imidacloprid [systematic name: (E)-1-(6-chloro-3-pyridyl-meth-yl)-N-nitro-imidazolidin-2-yl-idene-amine] and was obtained by the reduction of the latter using Fe in HCl. The dihedral angle between the pyridine and imidazole rings is 62.09 (12)°. The crystal structure is stabilized by N-H⋯Cl and C-H⋯Cl inter-actions involving the chloride anion. The pyridine N and the chloride atoms are not involved in inter-molecular inter-actions.