A new heterotrinuclear macrocyclic complex: bis­(μ-diethyl 5,6,7,8,15,16-hexa­hydro-6,7-dioxo-5,8,14,17-tetra­azadibenzo[a,g]cyclo­tetra­decine-13,18-dicarboxyl­ato)-1κ⁴N:2κ²O⁶,O⁷;2κO⁶,O⁷:3κ⁴N-dimethano­ldinickel(II)zinc(II) bis­(perchlorate)

The title compound, [Ni₂Zn(C₂₄H₂₂N₄O₆)₂(CH₄O)₂](ClO₄)₂, was synthesized using a mononuclear complex ligand NiL (L is diethyl 5,6,7,8,15,16-hexa­hydro-6,7-dioxo-5,8,14,17-tetraazadibenzo[a,g]cyclo­tetra­decine-13,18-dicarboxyl­ate), Zn(ClO₄)₂·6H₂O and CH₃OH. X-ray single-crystal analysis reveals that the Zn²⁺ ion is in a slightly distorted octa­hedral O₆ environment. The trinuclear complex cation is centrosymmetric. The Zn²⁺ and both Ni²⁺ ions are bridged by the oxamide group from the macrocyclic ligand L. Inter­molecular O—H...O hydrogen bonds exist between the perchlorate anion and the complex cation, and π–π inter­actions organize the trinuclear cations to form supramolecular one-dimensional chains in the crystal structure.

[Dimethyl 5,6,7,8,15,16-hexa­hydro-6,7-dioxo-5,8,14,17-tetra­azadibenzo[a,g]cyclo­tetra­deca-3,9,13,17-tetra­ene-13,18-dicarboxyl­ato-κ⁴N,N′,N′′′,N′′′']copper(II)

In the title complex, [Cu(C₂₂H₁₈N₄O₆)], the Cu^II atom is coordinated by four N atoms from a macrocyclic ligand with a square-planar geometry. Weak C—H...O hydrogen bonding occurs between neighbouring Cu^II complexes in the crystal structure.

5-(N,N-Dimethyl­ammonio­meth­yl)-2,2-dimethyl-4-oxido-6-oxo-6H-1,3-dioxine

The title compound, C₉H₁₅NO₄, a Mannich base of Meldrum's acid, proves to be an inner salt.