Copper(II) phosphate

Copper(II) phosphate

Names
IUPAC name copper(II) phosphate
Other names tricopper diphosphate tricopper bis(orthophosphate)
Identifiers
CAS Number	7798-23-4
ChemSpider	77984
Jmol interactive 3D	Image
PubChem	86469
InChI InChI=1S/3Cu.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6 Key: GQDHEYWVLBJKBA-UHFFFAOYSA-H
SMILES [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Cu+2].[Cu+2].[Cu+2]
Properties
Chemical formula	Cu3(PO4)2
Molar mass	380.580722 g/mol (anhydrous) 434.63 g/mol (trihydrate)
Appearance	light bluish-green powder (anhydrous) blue or olive crystals (trihydrate)
Solubility in water	insoluble
Solubility	anhydrous: soluble in ammonia trihydrate: soluble in ammonium hydroxide slightly soluble in acetone insoluble in ethanol
Structure
Crystal structure	orthorhombic (trihydrate)
Hazards
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 1 mg/m^3 (as Cu)[1]
REL (Recommended)	TWA 1 mg/m^3 (as Cu)[1]
IDLH (Immediate danger	TWA 100 mg/m^3 (as Cu)[1]
Related compounds
Other cations	Iron(II) phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Copper(II) phosphate (not to be confused with copper(I) phosphate) in an inorganic compound consisting of copper cations and the phosphate anions; with the chemical formula Cu₃(PO₄)₂. It may also be regarded as the cupric salt of phosphoric acid.

It is commonly encountered as the hydrated species Cu₂(PO₄)OH, which is green and occurs naturally as the mineral libethenite. Anhydrous copper(II) phosphate is blue with triclinic crystals and can be produced by a high-temperature reaction between diammonium phosphate and copper(II) oxide.^[2]

2 (NH₄)₂HPO₄ + 3 CuO → Cu₃(PO₄)₂ + 3 H₂O + 4 NH₃

References

1. "NIOSH Pocket Guide to Chemical Hazards #0150". National Institute for Occupational Safety and Health (NIOSH).
2. Shoemaker, G. L.; Anderson, J. B.; Kostiner, E. (15 September 1977). "Copper(II) phosphate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry 33 (9): 2969–2972. doi:10.1107/S0567740877010012.

• Handbook of chemistry and physics http://www.hbcpnetbase.com/