Cluster harvesting in the WBr6-P system

Area of Science:

• Solid-state chemistry
• Inorganic chemistry
• Materials science

Background:

• Tungsten bromide systems are complex, with potential for novel phase formation.
• Understanding metal-rich phases is crucial for developing new materials.

Purpose of the Study:

• To investigate phase formation in the WBr(6)-P system.
• To characterize new compounds using advanced analytical techniques.

Main Methods:

• Combined thermal scanning and X-ray diffraction (XRD) for phase analysis.
• Powder XRD for phase characterization.
• Solid-state magic-angle spinning (31)P NMR spectroscopy for ligand verification.

Main Results:

• A new compound, W(4)(PBr)Br(10), was synthesized by reducing WBr(6) with elemental phosphorus at 450 °C.
• The crystal structure was determined to be isotypic with W(4)(PCl)Cl(10), featuring a tetranuclear tungsten cluster.
• A μ(4)-capping bromophosphinidene ligand was identified.

Conclusions:

• The WBr(6)-P system yields novel metal-rich phases under specific conditions.
• W(4)(PBr)Br(10) represents a new tungsten cluster compound with a unique ligand arrangement.
• The study expands the understanding of tungsten-phosphorus-bromine chemistry.