Z.-L. Lu

p-(dimethylamino)benzaldehyde isonicotinoylhydrazone monohydrate

The single-crystal X-ray structure determination of the title compound, C15H16N4O.H2O, reveals that the molecule is in the keto tautomeric form and that the azomethine C=N double bond has the E configuration. The water molecule is hydrogen bonded to the hydrazone molecules to form a network structure in the crystal lattice. The crystal structure is stablilized by N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds.

p-Nitrobenzaldehyde Nicotinoylhydrazone Monohydrate

The X-ray analysis revealed that the title compound, C 13 H 10 N 4 O 3 .H 2 O, is a practically planar molecule which exists in the keto tautomeric form. The molecules lie parallel to (022) planes and form centrosymmetrically related dimers with possible π interactions. The water molecule bridges the hydrazone molecules of the adjacent stacks through hydrogen bonds and the crystal structure is stabilized by O-H...O, N-H...O and C-H...O hydrogen bonds.

Benzyl 3-(4-Dimethylaminobenzylidene)dithiocarbazate

The title Schiff base compound, C 17 H 19 N 3 S 2 , crystallizes in the triclinic system with two molecules in the asymmetric unit. The dimethylaminophenyl and carbazate parts of the molecule lie in one plane, perpendicular to the plane of the S-benzyl group. One of the two molecules in the asymmetric unit displays lateral disorder of the S-benzyl group. The molecular packing is governed by N-H...S hydrogen bonds leading to the formation of dimeric pairs of the same type, i.e. pairs of either normal or disordered molecules.

p-Methoxybenzaldehyde isonicotinoylhydrazone monohydrate

X-ray analysis reveals that the title compound, C 14 H 13 N 3 O 2 .H 2 O, is in keto tautomeric form and the configuration at the azomethine C=N double bond is E. The pyridine plane makes a dihedral angle of 39.9 (1)° with the plane through the central hydrazone bridge. The crystal structure is stabilized by extensive hydrogen bonding involving the water molecule and the hydrazone bridge.

Bis[methyl Nβ-(4-methoxyphenylmethylene)dithiocarbazato]nickel(II)

The structure of the title compound, [Ni(C10H11N2OS2)2], has been determined at 173 K. There are two independent complex molecules present in the crystal with two slightly different ligand conformations. Both independent Ni atoms lie on inversion centres.

4,5‐Diaza‐9‐fluorenone Isonicotinoylhydrazone Monohydrate

The title compound, C 17 H 11 N 5 O.H 2 O, forms two-dimensional layers parallel to the (101) plane. The dihedral angle between the planes of the diazafluorene moiety and the pyridine ring is 27.74 (4)°. The crystal structure is stabilized by O-H...N, N-H...O, C-H...O and C-H...N hydrogen bonds.

p-Methoxybenzaldehyde Nicotinoylhydrazone Dihydrate

The nearly planar aroylhydrazone molecule of the title compound, C 14 H 13 N 3 O 2 .2H 2 O, exists as the keto tautomer in the solid state with an E configuration across the C=N bond. The crystal structure is stabilized by extensive hydrogen bonding involving the water and the hydrazone molecules.

O-(tert-Butyl-dimethyl-silyl)tris-(O-4-methyl-phenyl-sulfon-yl)penta-erythritol.

In the title compound [systematic name: (tert-butyldimethylsilyl)methanetriyl tris(4-methylbenzenesulfonate)], C32H44O10S3Si, the central C atom and the SiIV center are in a tetrahedral configuration. The interplanar angles between pairs of the three benzene rings of the 4-methylphenylsulfonyl units are 41.15 (10), 18.11 (10) and 44.09 (10)°. C—H⋯π interactions are observed in the crystal structure. Molecules are linked into screw chains along the b axis by weak C—H⋯O interactions. Weak intramolecular C—H⋯O hydrogen bonds are also present.

p-Hydroxybenzaldehyde nicotinoylhydrazone monohydrate

The title compound, C 13 H 11 N 3 O 2 .H 2 O, is in the hydrazide tautomeric form and the configuration of the azomethine C=N double bond [1.275 (3) A] is E. In the solid state, the molecules are stacked parallel to (110) planes and form a hydrogen-bonded column-like supramolecular structure involving two independent water molecules on twofold axes.

1,1'-Diacetylferrocene bis(thiosemicarbazone) monohydrate

X-ray analysis reveals that both thiosemicarbazone groups of the title compound, [Fe(C 8 H 10 N 3 S) 2 ].H 2 O, are in the keto tautomeric form and that the configuration of the azomethine C=N double bond is E. The two cyclopentadienyl rings are parallel and nearly eclipsed. The crystal structure is stabilized by extensive intra- and intermolecular hydrogen bonding involving the water molecule and the thiosemicarbazone moieties.