Structural Diversity in Molecular Nickel Phosphide Carbonyl Nanoclusters

Area of Science:

• Inorganic Chemistry
• Materials Science
• Nanotechnology

Background:

• Nickel phosphide carbonyl clusters represent a class of nanomaterials with potential applications in catalysis and materials science.
• The controlled synthesis of well-defined molecular nanoclusters remains a challenge, particularly for complex metal-phosphide systems.

Purpose of the Study:

• To synthesize and structurally characterize novel molecular nickel phosphide carbonyl nanoclusters.
• To explore the influence of different phosphorus sources (PCl3, POCl3) and reaction conditions on the resulting cluster structures.
• To investigate the diversity of phosphorus environments within these nanoclusters.

Main Methods:

• Reaction of [Ni6(CO)12]2- with phosphorus chlorides (PCl3, POCl3) under varying conditions.
• Isolation and purification of nanocluster products based on solubility differences.
• Structural characterization using single crystal X-ray diffraction (SC-XRD).

Main Results:

• Synthesis of five new molecular nickel phosphide carbonyl nanoclusters: [Ni14P2(CO)22]2-, [Ni22-xPx(CO)29-x]4-, [Ni39P3(CO)44]6-, [Ni23-xPx(CO)30-x]4-, and [Ni22P6(CO)30]2-.
• Structural elucidation of these clusters, revealing diverse metal core sizes (0.59-1.10 nm) and overall dimensions (1.16-1.63 nm).
• Observation of a rich diversity in phosphorus atom environments, including pentagonal pyramids, trigonal prisms, square antiprisms, sphenocoronas, and icosahedra.

Conclusions:

• The study successfully demonstrates the controlled synthesis of complex nickel phosphide carbonyl nanoclusters.
• The choice of phosphorus source and reaction conditions significantly impacts the size and structure of the resulting nanoclusters.
• The diverse phosphorus coordination environments highlight the versatility of nickel phosphide nanocluster chemistry.