The title compound, C(17)H(18)N(2)O(5), was synthesized from 3,4,5-trimethoxy-benzohydrazide and 2-hydroxy-benzaldehyde. The dihedral angle between the planes of the two benzene rings is 29.9 (2)°. The crystal structure involves intra-molecular O-H⋯N, and inter-molecular N-H⋯O and C-H⋯O hydrogen bonds.

The title compound, C(15)H(10)F(N)O(3), was prepared from 2-nitro-acetphenone and 4-fluoro-benzaldehyde by an Aldol condensation reaction. The dihedral angle formed by the two benzene rings is 67.37 (2)°. The crystal structure is stabilized by weak inter-molecular C-H⋯O and C-H⋯F hydrogen bonds.

In the title compound, C(19)H(25)NO(2), the 3-eth-oxy-2-hy-droxy-benzaldehyde group is almost planar (r.m.s. deviation = 0.029 Å). An intra-molecular O-H⋯N hydrogen bond generates an S(6) ring. There are no inter-molecular hydrogen bonds.

The title compound, C(24)H(26)O(3), was prepared by the condensation reaction of 4-ethoxy-benzaldehyde with cyclo-hexa-none. The mol-ecule has crystallographic mirror symmetry and exhibits a butterfly-shaped geometry, with a dihedral angle of 5.46 (1)° between the two benzene rings. Weak inter-molecular C-H⋯π inter-actions help stabilize the crystal structure.

The title compound, C(12)H(9)FN(2)O(2), was prepared by the reaction of 2-fluoro-benzaldehyde and furan-2-carbohydrazide. The furan ring is disordered over two sets of sites with refined occupancies of 0.60 (3):0.40 (3). The major and minor components of the furan ring make dihedral angles of 51.9 (6) and 38.0 (10)°, respectively, with the benzene ring. In the crystal, mol-ecules are linked via...

In the title compound, C(20)H(19)O(4), the benzene rings, linked via five methyl-ene C atoms, form a dihedral angle of 77.28 (6)°. In the crystal, mol-ecules are linked via pairs of weak C-H⋯O inter-actions [graph set R(2) (2)(6)] into dimers that are further connected by additional weak C-H⋯O interactions [graph sets R(2) (2)(14), R(2) (2)(26) and R(2) (2)(6)].

In the crystal structure of the title compound, C(18)H(18)O(4), the full mol-ecule is generated by the application of an inversion centre. The mol-ecule is essentially planar, with an r.m.s. deviation of 0.017 (1) Å for all non-H atoms. The mol-ecules are linked through inter-molecular C-H⋯O inter-actions to form a mol-ecular sheet parallel to the ([Formula: see text]02) plane.

In the title compound, [AuI(C(19)H(15)OP)(2)], the complete mol-ecule is generated by the application of twofold symmetry. The Au(I) atom is in a trigonal-planar geometry within an IP(2) donor set with the greatest distortion seen in the P-Au-P angle [128.49 (3) °]. Close intra-molecular Au⋯O inter-actions [3.172 (3) Å] are observed. No specific inter-molecular inter-actions are noted in the cr...

The asymmetric unit of the title compound, C(9)H(11)NO·C(6)H(5)N(3)O(4), contains two independent mol-ecules each of 4-(dimethyl-amino)-benzaldehyde and 2,4-dinitro-aniline. In the crystal, the components are linked by inter-molecular N-H⋯O hydrogen bonds to form one-dimensional chains along [10[Formula: see text]]. Intra-molecular N-H⋯O hydrogen bonds are also present.

In the title compound, C(15)H(13)NO(5), the two benzene rings make a dihedral angle of 3.98 (7)°. The crystal packing is stabilized by weak non-classical inter-molecular C-H⋯O inter-actions that link mol-ecules into centrosymmetric tetra-mers.