Double-stranded helices and molecular zippers assembled from single-stranded coordination polymers directed by...

Area of Science:

• Coordination Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Coordination polymers offer tunable structures and properties.
• Nonlinear dicarboxylates and aromatic chelate ligands are key building blocks for complex architectures.
• Understanding structure-property relationships is crucial for designing advanced materials.

Purpose of the Study:

• To synthesize and characterize novel copper(II) coordination polymers.
• To investigate the influence of nonlinear dicarboxylates and aromatic ligands on polymer structure.
• To explore the formation of helical and zipper-like structures through supramolecular interactions.

Main Methods:

• Hydrothermal synthesis of copper(II) dicarboxylate coordination polymers.
• X-ray single-crystal structural analysis to determine molecular structures.
• Analysis of supramolecular interactions, including pi-pi stacking.

Main Results:

• Five neutral infinite copper(II) dicarboxylate coordination polymers were successfully synthesized.
• Nonlinear dicarboxylates induced helicity or flexuosity in the polymeric chains.
• Aromatic chelate ligands facilitated pi-pi aromatic stacking interactions.
• Combinations of ligands led to double-stranded helices or molecular zippers.

Conclusions:

• Nonlinear dicarboxylates are effective in controlling the structural flexibility of copper(II) coordination polymers.
• Aromatic chelate ligands play a vital role in directing supramolecular assembly.
• The rational design of ligand combinations can yield complex, ordered supramolecular structures.