Zhong‐Lu You

Diamminesilver(I) picrate

In the title compound, [Ag(NH3)2](C6H2N3O7), the AgI ion is bicoordinated in a linear configuration by two N atoms from two inversion-related ammine ligands. In the crystal structure, the picrate anions, with twofold rotation symmetry, are linked to the diamminesilver(I) cations through intermolecular N—H⋯O hydrogen bonds, forming two-dimensional layers parallel to the ac plane.

trans-Bis{2-[3-(cyclo­hexyl­amino)­propyl­imino­methyl]­phenolato}nickel(II) dinitrate

The title compound, [Ni(C16H24N2O)2](NO3)2, is a mononuclear nickel(II) compound. The NiII atom is coordinated by two N atoms and two O atoms from the Schiff base ligands. The four atoms around the metal are coplanar, constituting a slightly distorted square-planar geometry. The complex is located on an inversion center. All of the nitrate O atoms and all amine N atoms in the Schiff base ligands contribute to hydrogen bonds, leading to the formation of a three-dimensional network.

A silver(I) complex with Ag⋯Ag interactions: diamminesilver(I) p-nitro­benzoate

The title compound, [Ag(NH3)2](C7H4NO4), is a mononuclear silver(I) complex with two cations and two anions in the asymmetric unit. The cations have almost linear coordination geometry with two ammine ligands and are linked into centrosymmetric pairs by weak Ag⋯Ag interactions. In the crystal structure, the cations and anions are linked together through N—H⋯O hydrogen bonds, forming a three-dimensional structure.

catena-Poly­[[silver(I)-μ-ethane-1,2-diamine-κ2N:N′] 3-fluorobenzoate monohydrate]

The title compound, {[Ag(C 2 H 8 N 2 )](C 7 H 4 FO 2 ).H 2 O} n , has been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The Ag atom is bicoordinated in a linear configuration by two N atoms from two symmetry-related ethylenediamine ligands, giving linear polymeric chains with [-Ag-N-C-C-N-] n backbones running parallel to the b axis. In the crystal packing, these linear chains are interconnected by N-H...O and O-H...O hydrogen bonds, and by weak Ag...OW interactions, forming layers parallel to the ab plane.

trans-Bis{1-[3-(cyclo­hexyl­amino)­propyl­imino­methyl]-2-naphtholato-κ3O,N,N′}cobalt(III) perchlorate

In the title compound, [Co(C20H25N2O)(2)] ClO4, there are two independent centrosymmetric molecules of the cation, in which the central Co-III atoms are six-coordinated by four N atoms and two O atoms from two Schiff bases, giving approximately octahedral coordination environments.

4-(3-Methylphenyl)-3,5-di-2-pyridyl-4H-1,2,4-triazole

Compound (I) is a triazole derivative (Fig. 1). Some selected bond lengths and angles are listed in Table 1. The dihedral angle between the two pyridyl rings is 71.8 (3) . The dihedral angles between the benzene ring and the two pyridyl rings (C1/C2/C3/C4/C5/N1 and C8/C9/C10/C11/C12/N4) are 72.5 (3) and 74.5 (3) , respectively. The two pyridyl rings form dihedral angles of 35.9 (3) and 36.8 (3) , respectively, with the triazole ring. The dihedral angle between the triazole ring and the benzene ring is 75.7 (3) . The pyridyl groups and the benzene ring lie in a propeller arrangement around the central 1,2,4-triazole ring, thereby minimizing the steric crowding of these rings. The crystal packing is shown in Fig. 2.

Tetrakis{μ‐1‐[2‐(2‐oxidoethyl­amino)­ethyl­imino­methyl]‐2‐naphtholato}tetrazinc(II)

The title compound, [Zn4(C15H16N2O2)4], is a novel tetranuclear zinc(II) complex with crystallographic fourfold inversion–rotation symmetry. Each ZnII atom has a distorted square-pyramidal coordination geometry. In the basal plane, the Zn atom is coordinated by two N atoms and two O atoms of one Schiff base ligand. The apical position is occupied by an O atom of another Schiff base ligand. The four Zn atoms in the complex are linked through four bridging O atoms, forming an eight-membered ring.

[N,N′-Bis(2-hydroxy­naphthylmethenyl­imino)-1,2-ethanediaminato]­cobalt(II)

The title compound, [Co(C24H18N2O2)], is mononuclear. The CoII atom is coordinated by two N atoms and two O atoms from a bis–Schiff base ligand in a slightly distorted square-planar geometry.

trans-Bis{2-[3-(cyclo­hexyl­amino)­propyl­imino­methyl]­naphtholato}cobalt(III) perchlorate

The title complex, [Co(C20H25N2O)2]ClO4, is very similar to the mononuclear complex [Co(C16H23N2O)2]ClO4, which we reported recently [You, Qu, Liu, Tan & Zhu (2003). Acta Cryst. E59, m1038–m1040]. The central CoIII atom, lying on an inversion center, is coordinated by four N atoms and two O atoms from two Schiff bases, giving an approximately octahedral coordination environment.

Bis{2‐[3‐(diethyl­amino)­propyl­imino­methyl]­phenolato}copper(II) diperchlorate

In the title centrosymmetric mononuclear copper(II) compound, [Cu(C14H22N2O)2](ClO4)2, the CuII atom is coordinated by two N atoms and two O atoms from two Schiff base ligands. The coordination geometry is slightly distorted square-planar. The disordered perchlorate anions are hydrogen bonded to the cation via N—H⋯O hydrogen bonds.