NHC-Stabilised Parent Tripentelyltrielanes.

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry
• Coordination Chemistry

Background:

• Tripentelyltrielanes are a class of compounds known for their extreme air sensitivity.
• Stabilization of highly reactive main group element compounds often requires bulky ligands.
• N-heterocyclic carbenes (NHCs) are effective stabilizing ligands in organometallic chemistry.

Purpose of the Study:

• To synthesize and stabilize a missing family of tripentelyltrielanes.
• To investigate the use of bulky N-heterocyclic carbene (NHC) ligands for stabilization.
• To explore the coordination chemistry of these novel stabilized compounds.

Main Methods:

• Synthesis of tripentelylgallanes, tripentelylalanes, and tripentelylindiumane via salt metathesis reactions.
• Utilized bulky NHC ligand 1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene (IDipp) for stabilization.
• Characterization using multinuclear NMR spectroscopy and single crystal X-ray diffraction.
• Computational studies to elucidate electronic properties.

Main Results:

• Successful synthesis and isolation of NHC-stabilized tripentelylgallanes (IDipp⋅Ga(PH2)3 and IDipp⋅Ga(AsH2)3) and tripentelylalanes (IDipp⋅Al(PH2)3 and IDipp⋅Al(AsH2)3).
• Detection of the first NHC-stabilized tripentelylindiumane (IDipp⋅In(PH2)3).
• Isolation of a novel coordination compound involving gallium and mercury: [IDipp⋅Ga(PH2)2(μ3-PH2{HgC6F4}3)].
• Structural and electronic characterization confirmed the stabilization and coordination behavior.

Conclusions:

• The bulky NHC ligand IDipp effectively stabilizes extremely air-sensitive tripentelyltrielanes.
• This work expands the known scope of stabilized main group compounds.
• The stabilized compounds exhibit interesting coordination chemistry, as demonstrated by the mercury adduct.