Copper citrate

Copper(II) citrate

File:Anhydrous Copper(II) Citrate.jpg Anhydrous copper(II) citrate
Names
IUPAC name copper(II) 2-oxidopropane-1,2,3-tricarboxylate
Other names cupric citrate; dicopper citrate
Identifiers
CAS Number	866-82-0 hemipentahydrate: 6020-30-0
3D model (JSmol)	Interactive image hemipentahydrate: Interactive image
ChemSpider	21171752 hemipentahydrate: 32700143
ECHA InfoCard
EC Number	212-752-9
E number
PubChem CID	14454876 hemipentahydrate: 71586843
UNII	F70D117TTU hemipentahydrate: L40S1PLZ5W
CompTox Dashboard (EPA)	{{#property:P3117}}
InChI InChI=1S/C6H7O7.2Cu/c7-3(8)1-6(13,5(11)12)2-4(9)10;;/h1-2H2,(H,7,8)(H,9,10)(H,11,12);;/q-1;2*+2/p-3 Key: FWBOFUGDKHMVPI-UHFFFAOYSA-K hemipentahydrate: InChI=1S/2C6H7O7.4Cu.5H2O/c2*7-3(8)1-6(13,5(11)12)2-4(9)10;;;;;;;;;/h2*1-2H2,(H,7,8)(H,9,10)(H,11,12);;;;;5*1H2/q2*-1;4*+2;;;;;/p-6 Key: NBHBWRHMKGDJMS-UHFFFAOYSA-H
SMILES C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])[O-].[Cu+2].[Cu+2] hemipentahydrate: C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])[O-].C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])[O-].O.O.O.O.O.[Cu+2].[Cu+2].[Cu+2].[Cu+2]
Properties
Chemical formula	C6H4Cu2O7 (anhydrous); C6H4Cu2O7·2.5H2O (hemipentahydrate)
Molar mass	315.18 g·mol-1 (anhydrous); 360.22 g·mol-1 (2.5-hydrate)
Appearance	blue-green solid
Density	1.667 g·cm-3
Solubility in water	slightly soluble in water; more soluble in dilute acids and in aqueous ammonia
Hazards
GHS labelling:[1]
Pictograms	GHS07: Exclamation markGHS09: Environmental hazard
Signal word	Warning
Hazard statements	H302, H410
Precautionary statements	P264, P270, P273, P301+P317, P330, P391, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Copper(II) citrate is the copper(II) salt of citric acid that occurs in several hydration states. Commercial material is commonly a blue-green solid and is used as a source of copper in industrial, agricultural and some supplement applications.

Preparation

Copper(II) citrate can be prepared by reacting a soluble copper(II) salt such as copper(II) sulfate with trisodium citrate or tripotassium citrate; different hydrate stoichiometries may be isolated depending on conditions.

Properties

The anhydrous powder is blue while the hydrate is a light green.

Uses

Copper(II) citrate is used as a copper source in some agricultural micronutrient formulations and in proprietary supplement formulations. It is also used as a reagent and copper source in industrial and research contexts.