Ammonium tetrachloropalladate(II)
Chemical compound
From Wikipedia, the free encyclopedia
Ammonium tetrachloropalladate(II) is a chemical compound with the chemical formula (NH4)2PdCl4.[3][4] It is a reddish brown powder, forming brown to olive green crystals.[5]
| Names | |
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| IUPAC name
diazanium;tetrachloropalladium(2-) | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.034.075 |
| EC Number |
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| 45561 | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| Cl4H8N4Pd | |
| Molar mass | 312.31 g·mol−1 |
| Appearance | brown to green crystals |
| Density | 2.17 g/cm3 |
| Melting point | 140 °C |
| soluble[1] | |
| Solubility | insoluble in ethanol |
| Hazards | |
| GHS labelling:[2] | |
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| Warning | |
| H302, H312, H315, H319, H332, H335 | |
| Related compounds | |
Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure
Ammonium tetrachloropalladate(II) forms tetragonal crystals, space group P 4/mmm, cell parameters: a = 0.721 nm, c = 0.426 nm, Z = 1.[6]
Synthesis
Ammonium tetrachloropalladate(II) can be prepared by the slow evaporation of a solution containing tetrachloropalladic acid and ammonium chloride:
- H2[PdCl4] + 2NH4Cl → (NH4)2[PdCl4] + HCl
Another method involves passing chlorine through a palladium black suspension in a concentrated ammonium chloride solution:
- Pd + Cl2 + 2NH4Cl → (NH4)2[PdCl4]
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]
Reactions
With the gradual addition of ammonia, an insoluble compound referred to as "Vauquelin's salt" is formed.[8] It is the palladium analogue to Magnus's green salt.
- 2(NH4)2[PdCl4] + 4NH3 → [Pd(NH3)4][PdCl4] + 4NH4Cl