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Scandium─Group 13 Heterobimetallic Methylidene Clusters.

Gernot T L Zug¹, Cäcilia Maichle-Mössmer¹, Reiner Anwander¹

¹Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Inorganic Chemistry

|July 2, 2025

Summary

This summary is machine-generated.

This study details the synthesis of novel scandium complexes and their transformation into unique methylidene clusters. These findings offer new insights into organometallic chemistry and cluster formation reactions.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Area of Science:

Organometallic Chemistry
Coordination Chemistry
Materials Science

Background:

Scandium complexes with tetramethylmetalate ligands (Cp*₂Sc(EMe₄)) were synthesized.
These complexes serve as precursors for novel cluster compounds.
Understanding the reactivity of scandium organometallics is crucial for developing new synthetic methodologies.

Purpose of the Study:

To synthesize and characterize new scandium tetramethylgallate and tetramethylindate complexes.
To investigate the reactivity of these complexes in the formation of methylidene clusters.
To compare the reactivity of scandium complexes with related yttrium and lutetium complexes.

Main Methods:

Synthesis of Cp*₂Sc(AlMe₄) from Cp*₂ScCl(thf) and LiAlMe₄/AlMe₃.
Donor-assisted trimethyltriel exchange to yield Cp*₂Sc(EMe₄) (E = Ga, In).
Thermal treatment in benzene and reactions with excess metal alkyls.
Characterization using SC-XRD, ICP-OES, elemental analysis, and NMR spectroscopy (¹H, ¹³C{¹H}, ⁴⁵Sc).

Main Results:

Successful synthesis of the first scandium tetramethylgallate and tetramethylindate complexes.
Formation of methylidene clusters Cp*₆Sc₄E₈(CH₂)₁₂Me₆ (E = Ga, In) via methyl group deprotonation.
Observation of different reactivity pathways compared to yttrium analogs, leading to Ga₈(CH₂)₁₂ or Cp*₄Sc₄In₈(CH₂)₁₂Me₈ clusters.
Isolation of Me₂InCp*InMe₃ from reactions involving InMe₃ and HCp*.

Conclusions:

Scandium complexes exhibit unique reactivity in forming methylidene clusters, distinct from lighter lanthanides.
The study expands the known family of organometallic clusters with novel scandium-containing structures.
These findings contribute to the fundamental understanding of metal-ligand interactions and cluster assembly.