Ruthenium Decorated Tris-Silylated Germanium Zintl Clusters Featuring an Unexpected Ligand Arrangement

Area of Science:

• Inorganic Chemistry
• Organometallic Chemistry
• Zintl Cluster Chemistry

Background:

• Zintl cluster chemistry extensively studies transition metal incorporation into [Ge₉] clusters.
• Surface-bound transition metal atoms in clusters exhibit potential catalytic properties.

Purpose of the Study:

• To develop a synthetic route for new compounds featuring silylated Ge₉ clusters with organometallic ruthenium complexes.
• To investigate the influence of ligand steric bulk and solvent on cluster structure and metalation reactions.

Main Methods:

• Synthesis of four new silylated Ge₉-ruthenium compounds.
• Characterization using NMR spectroscopy, single-crystal X-ray diffraction, and LIFDI mass spectrometry.

Main Results:

• Four new compounds, including a novel isomer of [η¹-Ge₉(SiBu₂H)₃]RuCp(PPh₃)₂, were synthesized and characterized.
• Steric properties of ligands (Cp vs. Cp*, hypersilylchloride vs. ditertbutylsilane) significantly dictate atomic and ligand arrangement.
• Acetonitrile coordination induced ruthenium dissociation from the cluster surface, forming a new complex.

Conclusions:

• The selection of synthetic reagents, particularly ligands and solvents, is crucial for controlling the outcome of metalation reactions on Ge₉ clusters.
• Understanding these structure-directing effects enables precise synthesis of functionalized Zintl clusters.