Palladium(II) Sulfate

Basic Information of Palladium(II) Sulfate

CAS No.	13566-03-5
EC No.	237-466-1
Chemical Formula	PdSO₄
Molecular Weight	202.48 g/mol (anhydrous basis)
Appearance	Reddish-brown to dark brown crystalline powder or hydrated solid
Odor	Odorless
Melting point	Decomposes before melting (>300 °C)
Boiling point	Not applicable (decomposes)
Density	approx. 3.5–3.8 g/cm³
Solubility	Soluble in water; soluble in dilute acids
Nature (hazards)	Causes severe skin burns and eye damage, may cause allergic skin reaction, harmful if swallowed, toxic to aquatic life
RIDADR	UN 3260, Corrosive solid, acidic, inorganic, n.o.s. (Palladium(II) sulfate), Class 8, Packing Group III
Chemical Structure

Primary Applications of Palladium(II) Sulfate

Palladium(II) Sulfate serves as a clean, water-soluble Pd(II) source for high-performance plating and catalytic processes across electronics and chemicals sectors. As a halide-free palladium salt, it provides controlled Pd(II) availability without chloride contamination, making it particularly suitable for applications associated with palladium salt and catalyst precursor preparation, where defined coordination chemistry and solution purity are critical.

1. Electroplating & Electroless Palladium Deposition
   Provides Pd(II) ions for electrolytic and autocatalytic plating baths, producing bright, ductile, low-porosity palladium coatings on connectors, lead frames, and PCBs with excellent solderability and corrosion resistance. The sulfate anion supports stable bath chemistry and consistent metal ion concentration during deposition.

2. Supported Palladium Catalyst Preparation
   Used in impregnation or precipitation to deposit Pd on carbon, alumina, or silica supports, yielding active hydrogenation and hydrogenolysis catalysts for fine chemical production. Controlled reduction of sulfate-derived Pd(II) enables uniform metal dispersion and optimized catalytic surface area.

3. Organometallic Palladium Complex Synthesis
   Acts as a halide-free Pd(II) precursor for preparing phosphine, carbene, or amine Pd complexes in homogeneous catalysis and materials research. The absence of chloride ligands facilitates cleaner ligand substitution reactions and controlled complex formation.

4. Palladium Nanoparticle Synthesis
   Enables controlled reduction to generate Pd nanoparticles or colloids for electrocatalysis, sensors, and advanced functional materials with uniform dispersion. Reaction parameters such as pH and reducing agent concentration influence particle size and morphology.

5. Electronics & Surface Finishing
   Supports Pd deposition in high-reliability electronic components, offering low contact resistance and compatibility with gold or nickel underlayers. Sulfate-based systems contribute to improved coating adhesion and minimized impurity incorporation.

6. Fine Chemical & Research Applications
   Facilitates Pd-catalyzed transformations and serves as a standard Pd source in laboratory-scale studies requiring soluble, non-chloride Pd(II) species. Its defined stoichiometry supports reproducibility in catalyst screening and mechanistic investigations.

For a broader overview of palladium material categories—including salts, oxides, supported catalysts, and organometallic systems across industrial sectors—refer to Palladium Compounds: Applications, Categories & Industrial Uses.

• Accurate Palladium Content Control
  Precise analytical verification ensures consistent Pd assay, low residual impurities, and batch reproducibility for reliable plating or catalyst performance.

• Secure Precious Metal Sourcing
  Transparent, responsible palladium procurement with inventory buffering to provide supply continuity and competitive pricing.

• Technical Plating & Catalysis Support
  Experienced specialists offer guidance on bath formulation, deposition parameters, catalyst activation, and process optimization.

• Comprehensive Regulatory Compliance
  Full documentation including COA, REACH, RoHS, and detailed SDS to facilitate global operations and industry audits.

• Sustainability Commitment
  Ethical sourcing practices and palladium recovery/recycling programs aligned with ESG objectives and sustainable manufacturing.

Hazards Classification

• GHS Classification: Skin Corrosion/Irritation (Category 1B); Serious Eye Damage (Category 1); Skin Sensitization (Category 1); Acute Toxicity, Oral (Category 4); Aquatic Chronic (Category 2)

• Hazard Statements: H314: Causes severe skin burns and eye damage; H317: May cause an allergic skin reaction; H302: Harmful if swallowed; H411: Toxic to aquatic life with long lasting effects

• UN Number: UN 3260

• Hazard Class: 8 (Corrosive substances)

• Packing Group: III