Molecular rare earth metal alumosilicates

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Materials Science

Background:

• Lanthanide complexes are crucial in catalysis and materials science.
• Alumosilicate ligands offer unique structural diversity for metal coordination.

Purpose of the Study:

• To synthesize and characterize novel four-coordinated lanthanide alumosilicates.
• To investigate the coordination behavior of a bulky alumosilicate ligand with various lanthanides.

Main Methods:

• Reaction of a sterically hindered alumosilicate ligand with tris-cyclopentadienyl lanthanides.
• Isolation and structural characterization of resulting lanthanide alumosilicate compounds (2-9).
• Analysis of bonding modes and structural variations based on lanthanide ionic radius.

Main Results:

• Eight new lanthanide alumosilicate compounds (2-9) were successfully synthesized.
• The ligand adopted three distinct coordination modes: adducts, spirocyclic, and cyclic.
• Reactivity and structural diversity were correlated with lanthanide ionic radius and donor atom nature.
• The samarium derivative exhibited a unique polycyclic architecture with two tetra-coordinated samarium atoms.

Conclusions:

• The bulky alumosilicate ligand enables the synthesis of diverse four-coordinated lanthanide complexes.
• Lanthanide ionic radius plays a key role in determining coordination modes and structural outcomes.
• The study provides insights into the fundamental coordination chemistry of lanthanides with complex inorganic ligands.