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.

N,N′-Bis[2-(dimethyl­amino)eth­yl]dithio­oxamide

In the title compound, C₁₀H₂₂N₄S₂, mol­ecules lie across crystallographic inversion centres. Weak N—H...N and N—H...S hydrogen-bonding inter­actions are observed in the mol­ecular structure.

N,N′-Bis[2-(2-pyrid­yl)eth­yl]dithio­oxamide

The title compound, C₁₆H₁₈N₄S₂, has a crystallographic inversion centre at the mid-point of the central C—C bond. The plane of the dithio­oxamide fragment is approximately perpendicular to the plane of the dimethyl­ene bridge [dihedral angle = 84.8 (1)°], the plane of which is in turn normal to the pyridine ring plane [dihedral angle = 89.80 (8)°]. An inter­molecular N—H...N hydrogen bond involving the amide NH group and the pyridine N atom [N...N = 3.0503 (18) Å and N—H...N = 145.8 (14)°] links the mol­ecules into chains extending along the c axis.

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.

N,N′-Bis[2-(diethyl­amino)eth­yl]dithio­oxalamide

In the title compound, C₁₄H₃₀N₄S₂, the mol­ecules lie about crystallographic inversion centres. A weak N—H...S hydrogen-bonding inter­action is observed in the crystal structure.