(Me₄N)₂[Pt(CO₃)₂(OH)₂]: The Isolated Pt^IVO₆ Carbonato-Complex

Area of Science:

• Inorganic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Platinum complexes are crucial in catalysis and materials science.
• Developing novel platinum compounds with unique properties is an ongoing research area.
• Inorganic platinum(IV) complexes offer distinct reactivity and stability profiles.

Purpose of the Study:

• To synthesize and characterize the first fully inorganic platinum(IV) carbonato-complex.
• To investigate the stability and reactivity of the synthesized complex in aqueous solutions.
• To explore the potential of the complex for electrochemical platinum deposition.

Main Methods:

• Single-crystal and powder X-ray diffraction for structural determination.
• Spectroscopic techniques including Raman, FTIR, ESI-MS, and NMR for characterization.
• Thermogravimetric analysis (TG) for thermal stability assessment.
• Density functional theory (DFT) calculations for spectral analysis.

Main Results:

• Isolation and full characterization of the trans-[Pt(CO₃)₂(OH)₂]^2- complex as the (Me₄N)₂[Pt(CO₃)₂(OH)₂] salt.
• The complex crystallizes in the triclinic system (P-1) with a {PtO₆} coordination sphere.
• Demonstrated stability in aqueous solutions and facile modification of axial hydroxo ligands.
• Successful electrochemical deposition of platinum coatings from aqueous solutions of the complex without surfactants.

Conclusions:

• The novel platinum(IV) carbonato-complex exhibits significant stability and versatile reactivity.
• The complex serves as an effective precursor for surfactant-free electrochemical platinum deposition.
• This research opens avenues for new platinum-based materials and deposition techniques.