Chemistry:Copper benzoate

Copper benzoate

Names
IUPAC name copper dibenzoate
Other names cupric benzoate
Identifiers
CAS Number	533-01-7 Y
3D model (JSmol)	Interactive image Chinese lantern structure: Interactive image
ChemSpider	144339 Y
PubChem CID	164650
UNII	1M9U62M4WK Y
InChI InChI=1S/2C7H6O2.Cu/c2*8-7(9)6-4-2-1-3-5-6;/h2*1-5H,(H,8,9);/q;;+2/p-2 Y Key: YEOCHZFPBYUXMC-UHFFFAOYSA-L Y InChI=1/2C7H6O2.Cu/c2*8-7(9)6-4-2-1-3-5-6;/h2*1-5H,(H,8,9);/q;;+2/p-2 Key: YEOCHZFPBYUXMC-NUQVWONBAX
SMILES [Cu+2].[O-]C(=O)c1ccccc1.[O-]C(=O)c1ccccc1 Chinese lantern structure: c0ccccc0[C-](O[Cu+2]123)O[Cu+2](O[C-](O1)c0ccccc0)(O[C-](O2)c0ccccc0)O[C-](O3)c0ccccc0
Properties
Chemical formula	C14H10CuO4
Molar mass	305.7728 g/mol
Appearance	blue solid
Density	1.197g/cm3
Hazards
Flash point	111.4 °C (232.5 °F; 384.5 K)
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Related compounds
Other cations	sodium benzoate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tracking categories (test):

• SizeSet

Copper benzoate is the chemical compounds with the formula Cu(C₆H₅CO₂)₂(H₂O)_x. These coordination complexes are derived from the cupric ion and the conjugate base of benzoic acid. Many derivatives are known with diverse ancillary ligands. This compound has found some use as a source of blue light in fireworks.

Preparation

In laboratory, copper benzoate can be made by combining aqueous solutions of potassium benzoate with copper sulfate. Hydrated copper benzoate precipitates as a pale blue solid:

4 C
6H
5CO
2K + 2 CuSO
4 · 5H₂O → Cu
2(C
6H
5CO
2)
4(H
2O)
2 + 2 K
2SO
4 + 8 H
2O

The primary use of this compound is in production of blue flame in fireworks. Copper benzoate made from sodium benzoate for use in fireworks may result in strong yellow dilution of the flame unless the precipitate is carefully washed to remove sodium ion (which emits brightly yellow). Emission from potassium does not complicate the emission spectrum.-->

Related compounds

• copper salicylate

Structure

Structure of one form of copper(II) benzoate.

Copper(II) benzoates exists in at least two structural forms, depending on the degree of hydration. As in copper(II) acetate, one form of copper benzoate adopts a "Chinese lantern" structure, wherein a pair of copper centers are linked by four bridging carboxylate ligands. Typically, one site on each copper center is occupied by water, which can be replaced by other ligands. A hydrated form is also known, wherein each Cu(II) centre is bound to four water ligands and a bidentate O,O-benzoate.