Ba2[Pd(HS2O7)2(S3O10)2]: a heteroleptic polysulfatopalladate

Area of Science:

• Inorganic Chemistry
• Materials Science
• Solid-State Chemistry

Background:

• Palladium chemistry offers diverse applications.
• Polysulfate anions are challenging to synthesize and stabilize.
• Heteroleptic complexes with unusual ligands are of significant interest.

Purpose of the Study:

• To synthesize and characterize a novel palladium-containing polysulfate complex.
• To investigate the coordination behavior of hydrogendisulfate and trisulfate anions.
• To explore the stabilization of rare polysulfate anions in a heteroleptic complex.

Main Methods:

• Oxidation of elemental palladium with oleum in the presence of barium carbonate.
• Single-crystal X-ray diffraction for structural determination.
• Vibrational spectroscopy and quantum chemical calculations for characterization.
• Thermogravimetric/differential thermal analysis (TG/DTA) for thermal stability.

Main Results:

• Synthesis of yellow single crystals of Ba2[Pd(HS2O7)2(S3O10)2].
• Determination of the crystal structure revealing square-planar Pd(2+) coordination with HS2O7(2-) and S3O10(2-) ligands.
• Identification of the first heteroleptic polysulfatometallate and stabilization of the trisulfate anion.
• Characterization by spectroscopy, quantum chemistry, and thermal analysis.

Conclusions:

• The study reports the first heteroleptic polysulfatometallate, Ba2[Pd(HS2O7)2(S3O10)2].
• The complex formation stabilizes the trisulfate anion.
• The compound decomposes to palladium and barium sulfate upon heating.