Lanthanide and uranium complexes with an SPS-based pincer ligand.

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• The synthesis of novel metal complexes is crucial for developing new materials and catalysts.
• Anionic pincer ligands offer unique coordination properties and electronic characteristics.
• Lanthanide and uranium complexes are of interest due to their diverse applications.

Purpose of the Study:

• To synthesize and characterize new lanthanide and uranium complexes with an anionic SPS pincer ligand.
• To investigate the coordination behavior and structural features of these novel complexes.
• To explore the electronic properties imparted by the SPS ligand.

Main Methods:

• Reactions involving lanthanide and uranium precursors with the lithium or potassium salt of the [SPS(Me)]- anion.
• Isolation and purification of monosubstituted and homoleptic complexes.
• X-ray crystallography for structural determination.

Main Results:

• Successful synthesis of monosubstituted [Ln(BH4)2(SPS(Me))(THF)2] and homoleptic [Ln(SPS(Me))3] complexes for lanthanides (Ln = Ce, Nd).
• Isolation of [UX2(SPS(Me))2] complexes for uranium (U) with X = Cl, BH4.
• X-ray crystal structures reveal the flexible, tridentate coordination of the [SPS(Me)]- anion as a tertiary phosphine with electronic delocalization.

Conclusions:

• The anionic SPS pincer ligand can be effectively coordinated to lanthanide and uranium metal centers.
• The ligand's flexibility and electronic properties influence the resulting complex structures.
• These findings contribute to the understanding of organometallic chemistry involving pincer ligands and f-elements.