Fu‐You Pan

Synthesis and crystal structure of Ni(II) complexes of 2′-(3,5-dibromo-2-hydroxybenzylidene)-3,5-dihydroxybenzoylhydrazide

A new mononuclear nickel(II) complex incorporating a Schiff-base ligand, [NiL2](DMF)4 (HL = 2′-(3,5-dibromo-2-hydroxybenzylidene)-3,5-dihydroxybenzoylhydrazide), has been synthesized and characterized by IR, UV-Vis, elemental analysis and X-ray crystal structure analysis. HL is an anionic tridentate ligand. The nickel atom is hexacoordinated with two oxygen atoms from keto group and two oxygen atoms from hydroxy group and two nitrogen atoms from amide, with the two nitrogen atoms occupying the axial positions forming a distorted octahedral coordination sphere.

Synthesis and structure of a trimeric copper(II) complex of N ′-[(1Z)-1H-1,2,4-triazol-3-ylmethylene]- 1 H -1,2,4-triazole-3-carbohydrazide

The complex [Cu3L2Cl4](H2O)6 (HL = N′-[(1Z)-1H-1,2,4-triazol-3-ylmethylene]-1H-1,2,4-triazole-3-carbohydrazide) has been synthesized and characterized by IR, elemental analysis and X-ray crystal structure analysis. Crystal data: triclinic, P , a = 7.8591(12), b = 9.6745(14), c = 9.8798(15) Å, α = 83.301(3), β = 71.602(3), γ = 80.531(3)°, V = 701.40(18) Å3, Z = 1, D c = 2.014 Mg m−3, μ = 2.706 mm−1, F(000) = 425, R 1 = 0.0447, wR 2 = 0.1133 (I ≥ 2σ(I )), S = 1.001. The crystal structure contains [Cu3L2Cl4] trimers combining coordination and hydrogen bonding interactions. The geometries of the Cu(II) ions differ. The terminal Cu(II) ions have distorted square pyramidal geometry and are surrounded by two chloride anions and one deprotonated ligand. The central Cu(II) is square planar, bonded to one imino nitrogen atom and one carbonyl oxygen atom of each ligand.

Bis­[4-phenyl-5-(1H-1,2,4-triazol-3-yl)-4H-1,2,4-triazol-3-yl] di­sulfide

The title compound, C20H14N12S2, was synthesized by the reaction of 3-hydrazino-1H-1,2,4-triazole with phenyl isocyanate in benzene and by ring closure in an alkaline medium. Intermolecular N—H⋯N hydrogen bonds are observed and these form a five-membered ring.