Synthesis and characterization of ReO4-containing microporous and open framework structures

Area of Science:

• Materials Science
• Inorganic Chemistry
• Crystallography

Background:

• Coordination polymers offer tunable structures for various applications.
• Metal-organic frameworks (MOFs) are of interest due to their porosity and catalytic potential.
• Rhenium oxide groups are known components in oxidation catalysis.

Purpose of the Study:

• To synthesize and characterize novel copper-based coordination polymers.
• To investigate the structural features and porosity of the synthesized materials.
• To explore the potential of these materials as catalytic platforms.

Main Methods:

• Hydrothermal synthesis of copper-based coordination polymers.
• Characterization using Infrared (IR) spectroscopy, Thermogravimetric Analysis (TGA), and X-ray diffraction (XRD).
• Structural analysis including space group determination and unit cell parameters.

Main Results:

• Two distinct structures were obtained: [Cu(2)(pzc)(2)(H(2)O)(2)ReO(4)] (I) with a microporous 3D net and [Cu(pzc)(H(2)O)ReO(4)].2H(2)O (II) with stacked layers and cavities.
• Structure I features ellipsoidal channels (3.3-4.7 Å x 12.5 Å), while Structure II has H(2)O-filled cavities (4.4 Å x 5.1 Å).
• Thermogravimetric analysis showed water loss up to 64% for I and 100% for II before decomposition at 225°C and 265°C, respectively.

Conclusions:

• Novel copper coordination polymers with diverse framework topologies were successfully synthesized.
• The presence of ReO(4)(-) groups within the porous channels/cavities suggests potential for catalytic applications.
• The thermal stability and structural characteristics indicate suitability for further investigation in materials science.