trans-Bis­[4-(4-methyl­phenyl)-3,5-di-2-pyridyl-4H-1,2,4-triazole]­diperchlorato-κ²O-copper(II)

In the title centrosymmetric mononuclear copper(II) compound, [Cu(ClO₄)₂(C₁₉H₁₅N₅)₂], the central Cu^II atom is coordinated by four N atoms from two 4-(4-methyl­phenyl)-3,5-di-2-pyridyl-4H-1,2,4-triazole ligands, and two O atoms from two perchlorate counter-ions. The coordination geometry is slightly distorted octahedral.

cyclo-Tetra­kis{μ-1-[2-(2-oxidoethyl­amino)ethyl­imino­meth­yl]naphthalen-2-olato}tetra­nickel(II)

The title tetra­nuclear nickel(II) compound, [Ni₄(C₁₅H₁₆N₂O₂)₄], is isostructural with the zinc(II) complex reported recently [You, Ma, Zhu & Liu (2004). Acta Cryst. E60, m1599-m1601]. The complex has crystallographic symmetry. Each Ni^II atom has a distorted square-pyramidal geometry. In the basal plane, the Ni atom is coordinated by two N atoms and two O atoms of a Schiff base. The apical position is occupied by another O atom of another Schiff base.

Di-μ₂-acetato-bis­[μ₂-N,N′-bis­(salicyl­idene)butane-1,4-diaminato]trimanganese(II)

The title trinuclear compound, [Mn₃(C₁₈H₁₈N₂O₂)₂(C₂H₃O₂)₂], with a linear array of metal atoms, is isostructural with the cobalt(II) complex reported recently by You, Zhu & Liu [(2004). Acta Cryst. E60, m1900–m1902]. The central Mn^II ion, which is located on an inversion center, has a distorted octa­hedral geometry. The terminal Mn^II ion has an irregular square-pyramidal geometry. The Mn...Mn separation is 3.128 (2) Å.