Chlorido(5-formyl-2-hydroxy-phenyl-κC)mercury(II).

In the planar (r.m.s. deviation = 0.027 Å) title compound, [Hg(C(7)H(5)O(2))Cl], the Hg(II) atom shows a typical linear coordination by a C atom of the benzene ring and a Cl atom. Inter-molecular O-H⋯O hydrogen bonds are present in the crystal structure, resulting in chains propagating along the b axis. The crystal studied was a non-merohedral twin, with a twin ratio of 0.802 (2):0.198 (2).

1,5-Bis[(E)-cyclo-pentyl-idene]thio-carbono-hydrazide.

In the title mol-ecule, C(11)H(18)N(4)S, an intra-molecular N-H⋯N hydrogen bond [N⋯N = 2.558 (3)Å] is observed. The two cyclo-pentyl rings are disordered between two conformations in 1:1 and 2:1 ratios. In the crystal structure, weak inter-molecular N-H⋯S hydrogen bonds [N⋯S = 3.547 (3) Å] link pairs of mol-ecules into centrosymmetric dimers.

Bis(2,2'-bipyridyl-κN,N')(nitrato-κO,O')(trifluoro-acetato-κO)cadmium(II).

In the title complex, [Cd(C(2)F(3)O(2))(NO(3))(C(10)H(8)N(2))(2)], the Cd(II) ion is hepta-coordinated by two chelating 2,2'-bipyridyl ligands [Cd⋯N 2.370 (6)-2.416 (6) Å], one carboxyl-ate O atom [Cd⋯O 2.290 (6) Å] from the trifluoro-acetate ligand and two O atoms [Cd⋯O 2.386 (6), 2.633 (6) Å] from a chelating nitrate anion. The trifluoro-methyl fragment is rotationally disordered between two orientations in a 0.640 (7):0.360 (7) ratio. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds contribute to the crystal packing stability.

Diaqua-(2,6-dioxo-1,2,3,6-tetra-hydro-pyrimidin-3-ide-4-carboxyl-ato-κN,O)(1,10-phenanthroline-κN,N')manganese(II).

The title compound, [Mn(C(5)H(2)N(2)O(4))(C(12)H(8)N(2))(H(2)O)(2)], was synthesized by the reaction of manganese(II) acetate and orotic acid in the presence of 1,10-phenanthroline. The crystal structure exhibits inter-molecular N-H⋯O and O-H⋯O hydrogen bonds . The Mn coordination environment consists of an N(3)O(3) donor set in an octa-hedral geometry.

4-Amino-13-(1-naphth-yl)-[2,2]paracyclo-phane.

THE TITLE COMPOUND [SYSTEMATIC NAME: 1(2)-amino-4(2)-(1-naphth-yl)-1,4(1,4)-dibenzenacyclo-hexa-phane], C(26)H(23)N, was synthesized from 4-amino-13-bromo-[2,2]paracyclo-phane and 1-naphthalene-boronic acid in the presence of 1,4-dioxane. It is a new cyclo-phane-derived compound which can be regarded as a prospective ligand for asymmetric synthesis and catalysis. The benzene rings of the paracyclo-phane units are very slightly deformed from planarity as shallow boats.

[2,6-Dioxo-1,2,3,6-tetra-hydro-pyrim-idine-4-carboxyl-ato(2-)]bis(pyrazino[2,3-f][1,10]phenanthroline)cobalt(II) dihydrate.

The title complex, [Co(C(5)H(2)N(2)O(4))(C(14)H(8)N(4))(2)]·2H(2)O, features a slightly distorted octa-hedral geometry for Co due to the sterical requirements of the orotic acid and pyrazino[2,3-f][1,10]phenanthroline ligands. Inter-molecular hydrogen bonding between the uncoordinated water mol-ecules and the ligand stablizes the structure of the complex.

(E)-N'-(4-Pyridylmethyl-ene)-2-(quinolin-8-yl-oxy)acetohydrazide sesquihydrate.

In the title compound, C(17)H(14)N(4)O(2)·1.5H(2)O, the mean planes of the pyridine ring and quinoline group make a dihedral angle of 21.0 (2)°. One water molecule lies on a twofold rotation axis. The organic mol-ecules and the three water mol-ecules are linked into infinite chains by N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonds.