Mononuclear Rare-Earth Metalloligands Exploiting a Divergent Ligand.

Area of Science:

• Coordination Chemistry
• Organometallic Chemistry
• Materials Science

Background:

• Rare-earth elements (RE) are crucial in various advanced materials.
• Diketonato ligands and terpyridine derivatives are versatile building blocks in coordination chemistry.
• Synthesis of novel RE-containing complexes with specific coordination geometries is of significant interest.

Purpose of the Study:

• To synthesize novel rare-earth tris-diketonato metalloligands.
• To explore the structural characteristics of these complexes.
• To investigate the reactivity of these metalloligands in forming heterometallic compounds.

Main Methods:

• Room temperature reactions between rare-earth diketonato precursors and 4'-(4'''-pyridil)-2,2':6',2''-terpyridine (pyterpy).
• Single-crystal X-ray diffraction for structural elucidation of key complexes.
• Reactions with other metal diketonato complexes and platinum precursors to form heterometallic structures.

Main Results:

• Successful synthesis of mononuclear neutral rare-earth tris-diketonato metalloligands [RE(dike)₃pyterpy].
• Structural analysis revealed a nine-coordinate rare-earth ion with a muffin-like geometry.
• Formation of novel heterometallic complexes, including [Mpyterpy₂][RE(tta)₄]₂ and [RE(dike)₃pyterpyPtCl₂PPh₃].

Conclusions:

• A facile synthetic route to rare-earth metalloligands and subsequent heterometallic complexes was established.
• The structural diversity and coordination behavior of these RE complexes were demonstrated.
• These findings open avenues for designing new functional materials based on rare-earth coordination chemistry.