Potassium tetrachloropalladate(II)

Potassium tetrachloropalladate(II) is an inorganic chemical compound with the chemical formula K₂PdCl₄.^[2][3]

Potassium tetrachloropalladate(II)

Names
IUPAC name dipotassium; tetra chloropalladium(2-)
Identifiers
CAS Number	10025-98-6 N
3D model (JSmol)	Interactive image
ChemSpider	8016031
ECHA InfoCard	100.030.033
EC Number	233-049-3
PubChem CID	61438
CompTox Dashboard (EPA)	DTXSID50905298
InChI InChI=1S/4ClH.2K.Pd/h4*1H;;;/q;;;;2*+1;+2/p-4 Key: LGCKLDWLSVFMGL-UHFFFAOYSA-J
SMILES [K+].[K+].Cl[Pd--](Cl)(Cl)Cl
Properties
Chemical formula	Cl4K2Pd
Molar mass	326.42 g·mol−1
Appearance	dark brown crystals
Density	2.67 g/cm3
Melting point	525 °C
Solubility in water	soluble
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Precautionary statements	P261, P305, P338, P351
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Passing chlorine through a palladium black suspension in a concentrated potassium chloride solution:

Pd + Cl₂ + 2KCl → K₂[PdCl₄]

Reaction between concentrated solutions of palladium(II) chloride and potassium chloride:^[4]

PdCl₂ + 2KCl → K₂[PdCl₄]

Decomposition of potassium hexachloropalladate(IV):

K₂[PdCl₆] → K₂[PdCl₄] + Cl₂

Physical properties

The compound forms dark brown crystals of tetragonal crystal system, space group P 4/mmm, cell parameters: a = 0.706 nm, b = 0.706, c = 0.410 nm, α = 90°, Z = 1.^[5]

Potassium tetrachloropalladate(II) is relatively soluble in cold water, easily soluble in hot water, and poorly soluble in ethanol and acetone.^[6][7]

Chemical properties

The compound reacts with aqua regia:

3K₂[PdCl₄] + 6HCl + 2HNO₃ → 3K₂[PdCl₆] + 2NO + 4H₂O

Uses

The compound is used in the synthesis of semiconducting metal-containing polymers.

See also

• Ammonium tetrachloropalladate(II)
• Sodium tetrachloropalladate(II)