N'-(2-Fluoro-benzyl-idene)acetohydrazide.

The title compound, C(9)H(9)FN(2)O, was prepared by the reaction between 2-fluoro-benzophenone and acetohydrazide. In the crystal structure, inversion dimers linked by pairs of N-H⋯O hydrogen bonds occur, generating R(2) (2)(8) loops.

Hexaaqua-magnesium(II) bis-[4-(3-eth-oxy-2-hydroxy-benzyl-ideneamino)-3-methyl-benzene-sulfonate].

In the title compound, [Mg(H(2)O)(6)](C(16)H(16)NO(5)S)(2), the Mg(2+) ion (site symmetry 2) adopts an almost regular octa-hedral coordination geometry. The anion is stabilized by an intra-molecular O-H⋯N hydrogen bond, generating an S(6) ring, and the dihedral angle between the aromatic rings is 41.02 (7)°.

4-Chloro-N-[4-(diethyl-amino)benzyl-idene]aniline.

The asymmetric unit of the title compound, C(17)H(19)ClN(2), contains two independent mol-ecules which differ by a 180° flip in the orientation of the 4-chloro-aniline unit with respect to the diethyl-amino-benzyl-idene unit [N=C-C-C = 10.0 (3) and -170.6 (2)°].

(4-Amino-3-methyl-benzene-sulfonato)tri-μ-aqua-penta-aqua-disodium 4-amino-3-methyl-benzene-sulfonate.

In the title compound, [Na(2)(C(7)H(8)NO(3)S)(H(2)O)(8)](C(7)H(8)NO(3)S), one Na(+) ion is bonded to six water mol-ecules in a distorted octa-hedral arrangement while the other is bonded to five water mol-ecules and one O atom of a 4-amino-3-methyl-benzene-sulfonate anion, also yielding a distorted NaO(6) octa-hedron. Three of the water molecules bridge the metal ions and an intra-molecular O-H⋯O hydrogen bond helps to establish the conformation. In the crystal, the component species inter-act by way of O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds.

N'-(4-Cyano-benzyl-idene)thio-phene-2-carbohydrazide.

The title compound, C(13)H(9)N(3)OS, was prepared by the reaction of thio-phene-2-carbohydrazide and 4-formyl-benzonitrile. The dihedral angle between the benzene and thio-phene rings is 11.9 (1)°.

Methyl 3-(4-methyl-benzyl-idene)carbazate.

The title compound, C(10)H(12)N(2)O(2), was prepared by the reaction of methyl carbazate and 4-methyl-benzaldehyde. The dihedral angle between the benzene ring and the carbazate fragment is 20.86 (10)°.