Poly[diaquabis(mu3-2,2-dimethylpropanedioato)calcium(II)copper(II)]

Area of Science:

• Coordination Chemistry
• Materials Science
• Crystallography

Background:

• Heterobimetallic complexes offer unique properties by combining different metal ions.
• Malonate ligands are versatile building blocks in coordination chemistry.
• Understanding complex structures aids in designing new materials.

Purpose of the Study:

• To synthesize and characterize a novel heterobimetallic complex involving calcium and copper.
• To investigate the structural features and coordination environment of the complex.
• To explore the supramolecular interactions within the crystal structure.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structure.
• Analysis of coordination geometries around Cu(II) and Ca(II) ions.
• Identification of intermolecular hydrogen bonding networks.

Main Results:

• The title complex, [CaCu(C(5)H(6)O(4))(2)(H(2)O)(2)](n), represents the first heterobimetallic complex based on a substituted malonate dianion.
• A robust dianionic [Cu(C(5)H(6)O(4))(2)](2-) unit acts as a building block, coordinating to four Ca(2+) cations, forming a 2D layered structure.
• Cu(II) exhibits square planar coordination, while Ca(II) displays an eight-coordinate distorted bicapped trigonal-prismatic environment. Intermolecular hydrogen bonding, including graph sets R(1)(2)(8) and R(6), was observed.

Conclusions:

• The synthesized complex demonstrates a novel 2D layered structure driven by the coordination of calcium and copper ions with 2,2-dimethylmalonate ligands.
• The study highlights the potential of substituted malonates in constructing complex coordination architectures.
• The observed hydrogen bonding network contributes to the overall structural stability and organization.