[2.2]Paracyclophane Derivatives as Building Blocks for Coordination Polymers

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Synthesis

Background:

• [2.2]Paracyclophanes are versatile molecular scaffolds.
• Carboxylic acid functionalization is key for coordination chemistry.
• Suzuki coupling is a powerful tool for C-C bond formation.

Purpose of the Study:

• To synthesize novel di- and tetracarboxylic [2.2]paracyclophane derivatives.
• To explore the coordination chemistry of these derivatives.
• To construct novel coordination polymers.

Main Methods:

• Suzuki coupling reactions between brominated [2.2]paracyclophanes and 4-(methoxycarbonyl)phenylboronic acid.
• Reaction of a synthesized paracyclophane derivative with zinc nitrate.
• X-ray crystallography for structural determination.

Main Results:

• Successful synthesis of new di- and tetracarboxylic [2.2]paracyclophane derivatives.
• Formation of a 2D coordination polymer from pp-bis(4-carboxyphenyl)[2.2]paracylophane and zinc nitrate.
• Characterization of the coordination polymer, revealing zinc-carboxylate paddlewheel clusters and a five-coordinated zinc center with square-pyramidal geometry.

Conclusions:

• Novel paracyclophane derivatives can be synthesized efficiently.
• These derivatives are suitable building blocks for coordination polymers.
• The resulting coordination polymer exhibits unique structural features.