Potassium ion-mediated non-covalent bonded coordination polymers

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallography

Background:

• Coordination complexes involving rhodium are crucial in catalysis and materials science.
• Understanding network formation in coordination polymers is key to designing new materials.
• Pseudo-polymorphism in metal-organic compounds offers pathways to diverse structures.

Purpose of the Study:

• To synthesize and characterize novel rhodium chloro coordination polymers.
• To investigate the structural diversity and network dimensionality of these compounds.
• To elucidate the bonding interactions and electronic effects governing their formation.

Main Methods:

• Single-crystal X-ray diffraction for structural determination.
• Raman and FT-IR spectroscopy for vibrational analysis.
• Force-field calculations for bonding and electronic structure evaluation.
• Transmission Electron Microscopy (TEM) for morphological analysis.

Main Results:

• Three related pseudo-polymorphic solvated rhodium chloro compounds were synthesized and structurally characterized.
• Compounds 1 and 2 form 1-D coordination networks, while compound 3 exhibits a 2-D nano-layered structure.
• Force field studies indicated the dominance of the trans-effect over non-covalent bonding in the coordination polymeric structures.
• Evidence of K(+)-ligand interactions was observed through vibrational spectroscopy and force-field calculations.

Conclusions:

• The study presents novel coordination polymers with diverse network architectures.
• Non-covalent bonding plays a role, but the trans-effect is the primary driver in these rhodium systems.
• The findings contribute to the understanding of structure-property relationships in coordination polymers.