Copper (II) phosphate

Structural formula
General
Surname	Copper (II) phosphate
other names	Copper blue (ambiguous) Copper phosphate (ambiguous) Tricopper phosphate Copper orthophosphate
Molecular formula	Cu 3 (PO 4 ) 2
Brief description	green-blue odorless solid
External identifiers / databases
CAS number 7798-23-4 EC number 232-254-5 ECHA InfoCard 100.029.322 PubChem 86469 Wikidata Q112356
properties
Molar mass	380.58 g mol −1
Physical state	firmly
density	4.503 g cm −3
Melting point	> 300 ° C ° C
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302 P: 264-270-301 + 312-330-501
Toxicological data	1300 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Copper (II) phosphate is a chemical compound from the group of phosphates . It is the copper salt of phosphoric acid .

Occurrence

In nature, basic variants of copper phosphates occur in the form of the minerals cornetite , pseudomalachite , tagilite and libethenite .

Extraction and presentation

Copper (II) phosphate can be produced by reacting copper (II) oxide , copper (II) hydroxide or copper (II) carbonate with phosphoric acid.

${\displaystyle \mathrm {3\ CuCO_{3}+2\ H_{3}PO_{4}\ {\xrightarrow {\ 70^{o}C\ }}\ Cu_{3}(PO_{4})_{2}+3\ H_{2}O+3\ CO_{2}\uparrow } }$

The synthesis from disodium hydrogen phosphate and copper sulfate is also described:

${\displaystyle \mathrm {2\ Na_{2}HPO_{4}+3\ CuSO_{4}\ \longrightarrow \ Cu_{3}(PO_{4})_{2}+Na_{2}SO_{4}+2\ NaHSO_{4}} }$

properties

Copper (II) phosphate is a green-blue and odorless solid that is insoluble in water. It crystallizes as a trihydrate and has a triclinic crystal structure that is isomorphic to that of Stranskiit .

There is also a basic copper orthophosphate: Cu ₄ (OH) ₂ (PO ₄ ) ₂ forms dark green crystals and can be synthesized by prolonged exposure to copper phosphate with hot water. It occurs naturally as anhydrate in libethenite and as dihydrate in tagilit.

use

Copper (II) phosphate is used as a pigment (copper blue).

Individual evidence

1. ↑ ^{a b c d e} Kremer Pigments: MSDS 45364 - Copper Blue (PDF; 162 kB). ( Memento of April 7, 2014 in the Internet Archive ) Retrieved April 2, 2014.
2. ↑ ^{a b} G. L. Shoemaker, JB Anderson, E. Kostiner: Copper (II) phosphate. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 33, pp. 2969-2972, doi : 10.1107 / S0567740877010012 .
3. ↑ ^{a b c} data sheet copper (II) phosphate from AlfaAesar, accessed on January 3, 2011 ( PDF )(JavaScript required) .
4. ↑ ^{a b} M. H. Debray: "Mémoire sur la production d'un certain nombre de phosphates et d'arséniates cristallisés" in Ann. Chim. Phys. 1861 , 61 , p. 419ff. Full text
5. ↑ ^{a b c d e} R. Abegg, F. Auerbach, I. Koppel: "Handbuch der inorganic Chemie". Verlag S. Hirzel, 1908, 2nd volume, 1st section, p. 631. Full text .