Coordination and activation of the BF molecule

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Ligand Design

Background:

• Carbon monoxide (CO) is a well-established ligand in transition metal chemistry.
• Fluoroborylene (BF) is an isoelectronic analog of CO and N(2).
• The coordination and reactivity of BF with transition metals are less explored compared to CO.

Purpose of the Study:

• To synthesize and structurally characterize a transition metal complex featuring a bridging fluoroborylene (BF) ligand.
• To investigate the reactivity of the BF ligand in comparison to carbon monoxide (CO) under Lewis acid treatment.
• To explore the potential of BF as a unique ligand in organometallic chemistry.

Main Methods:

• Synthesis of the [{CpRu(CO)(2)}(2)(mu-BF)] complex.
• X-ray crystallography for structural characterization of the BF-containing complex.
• Reaction of the complex with aluminum trichloride (AlCl(3)) to study ligand reactivity.

Main Results:

• An unprecedented unsupported bridging BF ligand was successfully incorporated into a ruthenium complex.
• The BF ligand exhibited distinct reactivity compared to CO when treated with AlCl(3).
• Metal-bound CO coordinated through oxygen without bond cleavage, while BF underwent heterolytic cleavage.

Conclusions:

• Fluoroborylene (BF) demonstrates unique coordination and reactivity patterns distinct from carbon monoxide (CO).
• The unsupported bridging BF ligand represents a novel structural motif in transition metal chemistry.
• BF's heterolytic cleavage offers new possibilities for functionalization and catalytic applications in organometallic chemistry.