Ammonium tetrachloropalladate(II)

Ammonium tetrachloropalladate(II)
Names
	IUPAC name diazanium;tetrachloropalladium(2-)
	Other names Ammonium tetrachloropalladate, ammonium palladium chloride, diammonium tetrachloropalladate
Identifiers
CAS Number	13820-40-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:60149;
ChemSpider	55586;
ECHA InfoCard	100.034.075
EC Number	237-498-6;
Gmelin Reference	45561
PubChem CID	61682;
CompTox Dashboard (EPA)	DTXSID301014530 ;
	InChI InChI=1S/4ClH.2H3N.Pd/h41H;21H3;/q;;;;;;+2/p-2 Key: IRKVTUVFHGUMMN-UHFFFAOYSA-L;
	SMILES [H][N+]([H])([H])[H].[H][N+]([H])([H])[H].Cl[Pd--](Cl)(Cl)Cl;
Properties
Chemical formula	Cl4H8N4Pd
Molar mass	312.31 g·mol−1
Appearance	brown to green crystals
Density	2.17 g/cm3
Melting point	140 °C
Solubility in water	soluble
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H315, H319, H332, H335
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ammonium tetrachloropalladate(II) is a chemical compound with the chemical formula (NH₄)₂PdCl₄.^[2]^[3]

Synthesis

Slow evaporation of mixtures of solutions of tetrachloropalladium acid and ammonium chloride:

H₂[PdCl₄] + 2NH₄Cl → (NH₄)₂[PdCl₄] + HCl

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

Pd + Cl₂ + 2NH₄Cl → (NH₄)₂[PdCl₄]

Physical properties

Ammonium tetrachloropalladate(II) forms brown to olive green crysrals^[4] of tetragonal crystal system, space group P 4/mmm, cell parameters: a = 0.721 nm, c = 0.426 nm, Z = 1.

Soluble in water,^[5] insolible in ethanol.

Chemical properties

With the gradual addition of ammonia, the insoluble Vauquelin salt is formed.^[6]

2(NH₄)₂[PdCl₄] + 4NH₃ → [Pd(NH₃)₄][PdCl₄] + 4NH₄Cl

Uses

The compound is used for the preparation of palladium metallic particles. In addition, it forms Pd-creatinine complexes, which is used in the field of catalysis and semiconductors.^[7]