Supramolecular assemblies derived from methyl-substituted cucurbit[5]uril and lanthanide nitrates

Area of Science:

• Coordination Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Lanthanide complexes are crucial in various applications, including catalysis and medical imaging.
• Cucurbiturils are macrocyclic hosts with unique guest-binding properties.
• Supramolecular assemblies offer advanced functionalities through organized molecular structures.

Purpose of the Study:

• To synthesize and characterize novel lanthanide-based supramolecular complexes.
• To investigate the structural features and self-assembly behavior of these complexes.
• To explore the role of methylcucurbit[5]uril in directing the formation of lanthanide assemblies.

Main Methods:

• Synthesis of lanthanide complexes with methylcucurbit[5]uril in acidic media.
• Single crystal X-ray crystallography for molecular structure determination.
• Analysis of intermolecular interactions, including hydrogen bonding and metal-anion interactions.

Main Results:

• Isolation and structural elucidation of two discrete lanthanide complexes: [Me10Q[5]Gd(H2O)2Cl Gd(H2O)6](ZnCl4)2∙Cl∙8.9H2O and [Me10Q[5]Eu(H2O)3Cl(H3O)](FeCl4)3.
• Detailed structural analysis revealing discrete molecular units.
• Observation of dense stacking and supramolecular assembly formation driven by hydrogen bonding and metal-anion interactions.

Conclusions:

• The study successfully synthesized and characterized novel lanthanide-methylcucurbit[5]uril complexes.
• The crystal structures demonstrate the formation of discrete complexes that self-assemble into extended supramolecular structures.
• Hydrogen bonding and metal-anion interactions are key factors in the observed supramolecular architecture.