A new Schiff base copper (II) complex: bis­[N-(4-hydroxy­salicyl­idene)-N′,N′-diethylethylenediamine-κ²N,O]bis[(oxalato-κ²O,O′)copper(II)] dihydrate

The synthesis and characterization of a copper(II) complex of salicylaldimine, [Cu₂(C₂O₄)₂(C₁₃H₂₀N₂O₂)₂]·2H₂O, is de­scrib­ed. The reaction of 2,4-dihydroxy­benzaldehyde and N,N-diethyl­ethylenediamine with K₂[Cu(C₂O₄)₂] produces a centrosymmetric binuclear Cu^II complex. Its structure reveals that the copper(II) ion is five-coordinate and situated in a distorted square-pyramidal environment.

Heptaaqua­[tetra­chloro­phthalato(2–)]praseodymium(III) tetra­chloro­phthalate(–) tetra­chloro­phthalic acid monohydrate

The title complex, [Pr(C₈Cl₄O₄)(H₂O)₇](C₈HCl₄O₄)·C₈H₂Cl₄O₄·H₂O, has been synthesized and structurally characterized. The praseodymium(III) ion is coordinated by an O atom of a tetra­chloro­phthalate ligand and seven O atoms of water mol­ecules. The mol­ecular packing is reinforced by an extensive network of O—H...O hydrogen bonds.

A new Schiff base–copper(II) complex: [N-(2-hydroxy­ethyl)-N′-(2-oxidobenzyl­idene)ethyl­ene­di­amine-1κ⁴O,N,N′,O′][μ-N-(2-oxidobenzyl­idene)-N′-(2-oxidoeth­yl)ethyl­enediamine-1κO:2κ⁴O,N,N′,O′]­dicopper(II) perchlorate methanol solvate

The synthesis and characterization of the title Cu^II complex, [Cu₂(C₁₁H₁₄N₂O₂)(C₁₁H₁₅N₂O₂)]ClO₄·CH₄O, is described. The reaction of salicylaldehyde and N-(2-hydroxy­ethyl)ethyl­enediamine with [Cu(ClO₄)₂]·6H₂O produced the binuclear Cu^II complex in which the adjacent Cu^II atoms are connected by a μ-O bridge. One of the Cu^II atoms is in an elongated square-pyramidal geometry and the other has a distorted square-planar geometry.

Triaqua­(pyridine-2,5-dicarboxyl­ato-κ²N,O²)[4,4,5,5-tetra­methyl-2-(4-pyrid­yl)imidazoline-1-oxyl-κN²]zinc(II)

The title compound, [Zn(C₇H₃NO₄)(C₁₂H₁₆N₃O)(H₂O)₃], was prepared from the imino nitroxide radical ligand 2-(4-pyrid­yl)-4,4,5,5-tetra­methyl­imidazoline-1-oxyl, zinc(II) perchlorate and potassium pyridine-2,5-dicarboxyl­ate. The Zn^II ion exists in a distorted octa­hedral coordination geometry with one pyridyl N atom from a radical ligand, one N and one O atom from a bidentate pyridine-2,5-dicarboxyl­ate ligand and three O atoms from water mol­ecules. A two-dimensional network is formed through O—H...O hydrogen-bonding inter­actions.