Three-dimensional porous coordination polymer functionalized with amide groups based on tridentate ligand: selective...

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Crystallography

Background:

• Functionalized porous materials are crucial for molecular recognition and catalysis.
• Amide groups offer specific interaction sites but can form undesirable hydrogen bonds.
• Designing porous frameworks requires precise control over ligand connectivity and network topology.

Purpose of the Study:

• To synthesize a 3D porous coordination polymer (PCP) with amide groups for guest interactions.
• To investigate the structural properties and guest inclusion behavior of the PCP.
• To evaluate the catalytic activity and recyclability of the synthesized material.

Main Methods:

• Synthesis of a 3D coordination network using Cd(II) centers and a tridentate amide ligand (4-btapa).
• Characterization using X-ray powder diffraction, thermogravimetric analysis, and adsorption/desorption measurements.
• Evaluation of catalytic performance in a Knoevenagel condensation reaction.

Main Results:

• A novel 3D PCP, {[Cd(4-btapa)2(NO3)2].6H2O.2DMF}n (1a), was successfully synthesized.
• The PCP features amide groups lining channels (4.7 x 7.3 Ų) for selective guest interactions.
• Desolvated compound (1b) showed selective guest inclusion with structural transformation; catalyst 1a exhibited size-selective heterogeneous base catalysis and recyclability.

Conclusions:

• The synthesized 3D PCP effectively utilizes amide groups for controlled guest interactions.
• The material displays selective heterogeneous catalysis, maintaining structural integrity after reaction.
• This work highlights the potential of amide-functionalized PCPs in molecular separation and catalysis.