Zhong-Shu Li

A novel large Ni-azido circle with tridentate (NNO) Schiff base co-ligands: hexagonal structure and ferromagnetic properties

The reaction of nickel acetate tetrahydrate with Schiff base 2-[(pyridin-2-ylmethylimino)methyl] phenol (HL) in a methanol–water solution, adding NaN3 as a bridging ligand, yielded the complex [Ni(L)(μ1,1-N3)H2O]6·H2O. An X-ray structure determination showed that the complex is nearly a perfect hexagonal structure, and temperature (2–300 K) dependent magnetic susceptibility measurements indicated that it possesses ferromagnetic behavior.

Aqua­bis(2-methyl-4-oxopyrido[1,2-a]pyrimidin-9-olato)zinc(II) monohydrate

The crystal structure of the title compound, [Zn(C9H7N2O2)2(H2O)]·H2O, involves discrete mononuclear complex molecules. The special positions on the rotation twofold axis are occupied by ZnII and O atoms of the coordinated and uncoordinated water molecules. The coordination around the ZnII atom can be described as transitional from trigonal-bipyramidal to square-pyramidal. The two chelating 2-methyl-4-oxopyrido[1,2-a]pyrimidin-9-olate ligands and the coordinated water molecule form the Zn coordination. O—H⋯O hydrogen bonds between the coordinated water molecule and the ligand and between the uncoordinated water molecule and the ligand dominate the crystal packing.

catena-Poly[[bis-(3-benzoyl-pyridine-κN)zinc(II)]-di-μ-dicyanamido-κN:N].

The title compound, [Zn(C2N3)2(C12H9NO)2]n, is a polymeric zinc(II) complex with the metal ion located on an inversion centre. The ZnII ion is six-coordinated by two N atoms of two 3-benzoylpyridine ligands and four N atoms from four dicyanamide ligands, forming a slightly distorted octahedral configuration. In the crystal structure, neighboring Zn atoms are linked together by double dicyanamide bridges to form a polymeric zinc(II) complex.

2,2′-[1-(2,4,6-Trichlorophenyl)-1H-1,2,4-triazole-3,5-diyl]diphenol

The title compound, C20H12Cl3N3O2, was synthesized by the reaction of 2-(2-hydroxyphenyl)benz[e][1,3]oxazin-4-one with 2,4,6-trichlorophenylhydrazine in ethanol. The trichlorophenyl ring is nearly perpendicular to the triazole plane [dihedral angle 80.56 (8)°], whereas the two hydroxyphenyl rings are approximately coplanar with the triazole ring [dihedral angles of 2.79 (12) and 8.00 (14)°]. Intramolecular O—H⋯N hydrogen bonding is observed between the hydroxyphenyl and triazole rings.

Bis[μ-3-(2-hydroxy­ethyl)-2-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-9-olato-κ3N,O:O]bis[aquachloridocopper(II)]

In the dinuclear centrosymmetric copper(II) title compound, [Cu2(C11H11N2O2)2Cl2(H2O)2], each CuII ion has a slightly distorted trigonal-bipyramidal geometry and is coordinated by one N and one O atom from one 3-(2-hydroxyethyl)-2-methyl-4-oxopyrido[1,2-a]pyrimidin-9-olate ligand, another O atom from the second ligand, one water molecule and one Cl atom. The crystal structure involves intermolecular C—H⋯Cl, O—H⋯Cl and O—H⋯O hydrogen bonds

Bis{μ-2-[2-(2-pyrid­yl)ethyl­imino­meth­yl]phenolato}bis­[azido­zinc(II)]

In the centrosymmetric title dinuclear zinc(II) compound, [Zn2(C14H13N2O)2(N3)2], each ZnII ion has a slightly distorted trigonal bipyramidal geometry and is coordinated by two N atoms and one O atom from one Schiff base ligand, an O atom from the other Schiff base ligand, and another N atom from an azide ligand. The crystal structure involves intermolecular C—H⋯N hydrogen bonds.

Aqua­(1,10-phenanthroline-κ2 N,N′)bis­(trimethyl­acetato)-κ2 O,O′;κO-cobalt(II)

In the title compound, [Co(C5H9O2)2(C12H8N2)(H2O)], the CoII atom is coordinated in a distorted octahedral environment by three carboxyl O atoms of two trimethylacetate ligands, one aqua O atom and two N atoms from 1,10-phenanthroline. The crystal structure is stabilized by O—H⋯O hydrogen bonds and π–π stacking interactions [interplanar distance between interdigitating 1,10-phenanthroline ligands = 3.378 (2) Å].

Aqua-(1,10-phenanthroline-κN,N')bis-(trimethyl-acetato)-κO,O';κO-cobalt(II).

In the title compound, [Co(C5H9O2)2(C12H8N2)(H2O)], the CoII atom is coordinated in a distorted octahedral environment by three carboxyl O atoms of two trimethylacetate ligands, one aqua O atom and two N atoms from 1,10-phenanthroline. The crystal structure is stabilized by O—H⋯O hydrogen bonds and π–π stacking interactions [interplanar distance between interdigitating 1,10-phenanthroline ligands = 3.378 (2) Å].

Aqua­(1,10-phenanthroline-κ2N,N′)bis­(trimethyl­acetato)-κ2O,O′;κO-cobalt(II)

In the title compound, [Co(C5H9O2)2(C12H8N2)(H2O)], the CoII atom is coordinated in a distorted octahedral environment by three carboxyl O atoms of two trimethylacetate ligands, one aqua O atom and two N atoms from 1,10-phenanthroline. The crystal structure is stabilized by O—H⋯O hydrogen bonds and π–π stacking interactions [interplanar distance between interdigitating 1,10-phenanthroline ligands = 3.378 (2) Å].

(RS)-N-[(4-Chloro­phen­yl)(phen­yl)­meth­yl]­formamide

The racemic title compound, C14H12ClNO, contains two molecules in the asymmetric unit. The dihedral angles between the phenyl and benzene rings are 84.03 (15) and 83.92 (13)°. The crystal structure involves intermolecular N—H⋯O, C—H⋯Cl and C—H⋯O hydrogen bonds, linking molecules into layers parallel to the (100) plane.