Poly[(μ(3)-5-bromo-nicotinato)(5-bromo-nicotinato)copper(II)]

Area of Science:

• Materials Science
• Inorganic Chemistry
• Crystallography

Background:

• Coordination polymers are advanced materials with diverse applications.
• Understanding the self-assembly of layered structures is crucial for designing new materials.
• Copper(II) coordination polymers offer tunable properties based on ligand choice.

Purpose of the Study:

• To synthesize and characterize a novel 3D coordination polymer using 5-bromo-nicotinate ligands.
• To investigate the structural features of the resulting material, including its layered assembly.
• To explore the role of pi-pi stacking in forming the 3D supramolecular architecture.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structure.
• The synthesis involved reacting copper(II) salts with 5-bromo-nicotinate ligands.
• Structural analysis focused on coordination environments, layer formation, and intermolecular interactions.

Main Results:

• A novel 3D coordination polymer, [Cu(C(6)H(3)BrNO(2))(2)](n), was successfully synthesized.
• The structure consists of two distinct 2D coordination polymer layers (twin layers) with similar composition but different bond parameters.
• These layers are linked by bridging ligands forming paddle-wheel motifs and stacked via pi-pi interactions (3.626 Å) into a 3D supramolecular network.

Conclusions:

• The study presents a new 3D coordination polymer with a unique twin-layered structure.
• Pi-pi stacking interactions play a key role in the formation of the 3D supramolecular architecture.
• The findings contribute to the understanding of self-assembly mechanisms in coordination polymers.