Y.-P. Tian

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.

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.

Diiodobis(4-methoxybenzaldehyde thiosemicarbazone-S)cadmium(II)

The title complex, [CdI 2 (C 9 H 11 N 3 OS) 2 ], contains distorted tetrahedral [CdI 2 L 2 ] units (where L is 4-methyoxybenzaldehyde thiosemicarbazone), in which L molecules are S-bonded in a monodentate mode to the cadmium ion. Principal dimensions include Cd-S 2.5875 (10) and 2.5795 (10) A, and Cd-I 2.7020 (4) and 2.7470 (4) A.

Dichlorobis(dimethylformamide-O)bis(4-nitrobenzaldehyde thiosemicarbazone-S)cadmium(II)

The title complex, [CdCl 2 (C 3 H 7 NO) 2 (C 8 H 8 N 4 O 2 S) 2 ], crystallizes in space group P1 with half a molecule in the asymmetric unit. The Cd atom lies on an inversion centre and is octahedrally coordinated to two O atoms from the dimethylformamide ligands, two S atoms from the thiosemicarbazone ligands and two Cl atoms.

Bis{methyl Nβ-[4-(di­propyl­amino)­benzyl­idene]­di­thio­carb­aza­to}nickel(II)

The Schiff base ligand in the title complex, [Ni(C15H22N3S2)2], lost a proton from its tautomeric thiol form and coordinated to Ni(II) via the mercapto S and β-N atoms. The geometry around the Ni atom is square planar with two equivalent Ni—N and Ni—S bonds. The two phenyl rings and the coordination moieties are in one plane forming an extensive electronic delocalization system. The structure is governed by C—H⋯S and C—H⋯N hydrogen bonds, leading to the formation of centrosymmetric dimers.

4-Amino-3-methyl-1,2,4-triazole-5-thione derivative of p-nitrophenylaldehyde

In the title compound, 3-methyl-4-(4-nitrobenzylidene-nitrilo)-4, 5-dihydro-1H-1,2,4-triazole-5-thione (C 10 H 9 -N 5 O 2 S), the triazole ring is in a planar form. The whole molecule lies in a crystallographic plane. The mean planes through the triazole ring and the phenyl ring form a dihedral angle of 15.9 (1)°. There is an intermolecular N-H…O hydrogen bond.

A copper(I) complex of 4-amino-3-thioxo-6-methyl-2,3,4,5-tetrahydro-1,2,4-triazin-5-one

In the crystal of the title compound, bis(4-amino-κN-3-thioxo-κS-6-methyl-2,3,4,5-tetrahydro 1,2,4-triazin-5-one)copper(I) chloride, [Cu(C 4 H 6 N 4 O) 2 ]Cl, the asymmetric unit contains one-half of the cation, with the other half related by a crystallographic twofold axis; the Cl and Cu atoms lie on the twofold axis. The Cu atom is in a distorted tetrahedral geometry. The inversion-related molecules are linked by N… O [2.805 (3) A] short contacts to form an infinite zigzag chain along the c direction. The Cl atom is involved in both intra- and inter-chain N-H…Cl hydrogen bonds.

(Acetato-O,O')[tris(2-aminoethyl)amine-N,N',N'',N''']nickel(II) perchlorate

The X-ray structure analysis of the title compound, [Ni(C2H3O2)(C6H18N4)]ClO4, reveals it to consist of a distorted octahedral entity, with the NiII atom coordinated by four N atoms from a tris(2-aminoethyl)amine (tren) ligand and two O atoms from an acetate anion. The acetate anion coordinates to NiII as a bidentate ligand forming a four-membered ring, with the two O atoms chelating in different manners, resulting in different C—O and Ni—O bond distances.