Three coordination polymers built by quaternary-ammonium-modified isophthalic acid

Area of Science:

• Materials Chemistry
• Coordination Chemistry
• Supramolecular Chemistry

Background:

• Quaternary-ammonium-modified isophthalic acid ligands offer unique structural possibilities in coordination polymer synthesis.
• The incorporation of halide ions and metal clusters can lead to diverse network architectures.
• Solvothermal synthesis provides a versatile route for constructing complex inorganic-organic hybrid materials.

Purpose of the Study:

• To synthesize and characterize novel coordination polymers (CPs) using a quaternary-ammonium-modified isophthalic acid ligand.
• To investigate the structural diversity and network formation in CPs containing copper and zinc ions.
• To explore the role of counter-anions in the construction of polymeric frameworks.

Main Methods:

• Solvothermal reactions were employed for the synthesis of the coordination polymers.
• Single-crystal X-ray diffraction was used to determine the detailed structures of the CPs.
• Elemental analysis and spectroscopic techniques were utilized for characterization.

Main Results:

• Three coordination polymers (CPs 1, 2, and 3) were successfully synthesized.
• CP 1 exhibits a chain structure based on tetranuclear Cu4(OH)2 clusters linked by the organic ligand.
• CP 2 features a 2D layered structure incorporating both Cu4(OH)2 clusters and CuBr3 units, interconnected by the ligand.
• CP 3 presents a 2D layered structure built from binuclear Zn2 units and the organic ligand.
• Bromide counter-anions actively participate in the formation of the polymeric networks in all three CPs.

Conclusions:

• The quaternary-ammonium-modified isophthalic acid ligand is effective in constructing diverse coordination polymer architectures.
• The presence of different metal ions (Cu, Zn) and cluster types (Cu4, Zn2) leads to varied dimensionalities (1D chains, 2D layers).
• Halide ions play a crucial role as structural components in these coordination polymer networks.