Copper oxychloride

General
Surname	Copper oxychloride
other names	Copper (II) trihydroxide chloride Dicopper chloride trihydroxide basic copper chloride
Molecular formula	CuCl 2 · 3 Cu (OH) 2 also: Cu 2 (OH) 3 Cl
Brief description	blue-green powder
External identifiers / databases
CAS number 1332-65-6 (anhydrous) 1332-40-7 (tetrahydrate) EC number 215-572-9 ECHA InfoCard 100.014.158 PubChem 11969527 Wikidata Q2647468
properties
Molar mass	213.56 g mol −1
Physical state	firmly
density	3.74 g cm −3
Melting point	> 220 ° C (decomposition)
solubility	practically insoluble in water (0.0012 g l −1 at 20 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 301-332-410 P: 273-501
MAK	0.1 mg m −3
Toxicological data	700 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 oxychloride is a chemical compound of copper from the groups of hydroxides and chlorides .

α-copper oxychloride crystals

Manufacturing

Copper oxychloride can be produced by the hydrolysis of cupric chloride .

${\displaystyle \mathrm {2\ CuCl_{2}+3\ NaOH\rightarrow Cu_{2}(OH)_{3}Cl+3\ NaCl} }$

or

${\displaystyle \mathrm {CuCl_{2}+3\ CuO+3\ H_{2}O\rightarrow 2\ Cu_{2}(OH)_{3}Cl} }$

It is obtained industrially by oxidizing copper (I) chloride in a brine solution . For this, copper (II) chloride is reduced in concentrated sodium chloride solution with copper metal . The resulting copper (I) chloride is then heated and oxidized to copper oxychloride in air.

${\displaystyle \mathrm {CuCl_{2}+Cu+2\ NaCl\rightarrow 2\ NaCuCl_{2}} }$

${\displaystyle \mathrm {6\ NaCuCl_{2}+{\tfrac {3}{2}}O_{2}+\ H_{2}O\rightarrow } }$ ${\displaystyle \mathrm {CuCl_{2}\cdot 3\ Cu(OH)_{2}+2\ CuCl_{2}+6\ NaCl} }$

use

Copper oxychloride is used as a contact fungicide .

The approval of copper oxychloride as one of several “copper compounds” by the EU Commission took place with effect from December 1, 2009 for applications as a bactericide and fungicide.

In Germany, pesticides with this active ingredient are approved for growing pome fruit and strawberries. In Austria and Switzerland, copper oxychloride preparations are permitted in potatoes and grapevines as well as in a large number of fruits, berries and vegetables.

Individual evidence

1. ↑ ^{a b c d e f g h i} Entry on copper (II) trihydroxide chloride in the GESTIS substance database of the IFA , accessed on March 25, 2013(JavaScript required) .
2. ↑ Entry on Dicopper chloride trihydroxide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
3. ↑ data sheet copper oxychloride, Aldrich ^CPR at Sigma-Aldrich , accessed on March 5, 2019 ( PDF ).
4. ↑ Commission Directive 2009/37 / EC of April 23, 2009 amending Council Directive 91/414 / EEC to include the active substances chlormequat, copper compounds, propaquizafop, quizalofop-P, teflubenzuron and zeta-cypermethrin (PDF)
5. ↑ General Directorate Health and Food Safety of the European Commission: Entry on Copper oxychloride in the EU pesticide database ; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on February 23, 2016.