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Updated: Jun 15, 2025
05:50
Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
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Transition Metal Parent Alumylene Complexes: Synthesis, Structures, and XPS Characterization of Aluminum Oxidation
Keita Sato1, Takashi Komuro1, Susumu Imashuku2
1Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Inorganic Chemistry
|August 27, 2024
Summary
Researchers synthesized novel transition metal complexes featuring a unique aluminum(I)-hydride unit. These compounds exhibit strong sigma-donation and potential for catalytic applications like CO2 reduction.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Main Group Chemistry
Background:
- The chemistry of low-valent main group elements remains a frontier in inorganic synthesis.
- Aluminum, typically found in the +3 oxidation state, exhibits unique reactivity in lower oxidation states.
Purpose of the Study:
- To achieve the first isolation and characterization of transition metal complexes incorporating the parent Al(I)-H unit.
- To explore the electronic properties and reactivity of these novel Al(I) complexes.
Main Methods:
- Synthesis of tungsten (W) and iron (Fe) complexes via a one-step reaction.
- Characterization using 1H and 27Al nuclear magnetic resonance (NMR), infrared (IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS).
- Density Functional Theory (DFT) calculations to elucidate electronic structure and bonding.
Main Results:
- Successful synthesis of base-stabilized Al(I)-H transition metal complexes (Cp*(CO)n(H)M←:AlH(NHC)2) in 43-63% yields.
- Spectroscopic and computational analyses revealed strong sigma-donating properties of the :AlH(NHC)2 ligand and highly polarized M(δ-)←:Al(δ+) bonds.
- Confirmation of the monovalent oxidation state of the aluminum center.
- Demonstration of catalytic activity in hydroalumination of carbodiimide and reduction of CO2 to CO.
Conclusions:
- The study presents the first stable transition metal complexes with an Al(I)-H moiety.
- These complexes showcase unique electronic properties and reactivity, opening avenues for new catalytic transformations.
- The findings expand the scope of low-valent aluminum chemistry and its integration with transition metals.
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