Copper benzoate

Copper benzoate
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Names
	IUPAC name copper dibenzoate
	Other names cupric benzoate
Identifiers
CAS Number	533-01-7 ;
3D model (JSmol)	Interactive image; Chinese lantern structure: Interactive image;
ChemSpider	144339 ;
PubChem CID	164650;
UNII	1M9U62M4WK ;
	InChI InChI=1S/2C7H6O2.Cu/c28-7(9)6-4-2-1-3-5-6;/h21-5H,(H,8,9);/q;;+2/p-2 Key: YEOCHZFPBYUXMC-UHFFFAOYSA-L ; InChI=1/2C7H6O2.Cu/c28-7(9)6-4-2-1-3-5-6;/h21-5H,(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	C; 14H; 10CuO; 4; C; 14H; 12CuO; 5 (dihydrate);
Molar mass	305.77 g/mol; 323.795 g/mol (dihydrate);
Appearance	blue solid
Density	1.197 g/cm3
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H315, H319, H335
GHS precautionary statements	PP261Script error: No such module "Preview warning".Category:GHS errors, PP305+P351+P338Script error: No such module "Preview warning".Category:GHS errors
Flash point	111.4 °C (232.5 °F; 384.5 K)
	NIOSH (US health exposure limits):Template:Chembox NIOSH (set)/formatPocketGuideLink
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; Potassium 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

Copper benzoate is the chemical compound with the formula Cu
2(C
6H
5CO
2)
4(H
2O)
2. These coordination complexes are derived from the cupric ion and the conjugate base of benzoic acid. Many derivatives are known with diverse ancillary ligands.^{[citation needed]} It has found some niche use as a combination fuel and source of copper ion for blue light production in fireworks.^[3]

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:^{[citation needed]}

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

Uses

It is sometimes used by hobbyists as a fuel and blue flame colorant in pyrotechnics, but it is not on the list of chemicals approved in consumer fireworks in the US.^[4]

It is also used in two-part dental adhesives, in polyester resin compositions to increase thermal resistance and decrease gelation, and as a metal-based hydrogen sulfide scavenger in asphalt.^[1]

Structure

Copper(II) benzoate 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,^[5] 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.^[6] A hydrated form is also known, wherein each Cu(II) centre is bound to four water ligands and a bidentate O,O-benzoate.^[7]

Related compounds

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 "Copper Benzoate SDS". Dr. J. Pharmachem Pvt. Ltd.. https://www.jpharmachem.com/content/uploads/2023/12/copper-benzoate-msds.pdf.
↑ ^2.0 ^2.1 Sigma-Aldrich Co., Benzoic acid, copper (II) salt dihydrate.
↑ "Formulas For Firework Stars Using Copper Benzoate" (in en). https://www.skylighter.com/blogs/how-to-make-fireworks/copper-benzoate-blue-fireworks-stars.
↑ "Approved and Prohibited Fireworks Chemicals". US Department of Transportation. https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/approvals-and-permits/hazmat/energetic-materials-approvals/18306/list-approved-and-prohibited-fireworks-chemicals.pdf.
↑ Wells, A. F. (1984). Structural inorganic chemistry (5th ed.). Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press. ISBN 0-19-855370-6.
↑ Kawata, T.; Uekusa, H.; Ohba, S.; Furukawa, T.; Tokii, T.; Muto, Y.; Kato, M. (1 June 1992). "Magneto-structural correlation in dimeric copper(II) benzoates". Acta Crystallographica Section B Structural Science 48 (3): 253–261. doi:10.1107/S0108768191012697.
↑ Koizumi, Hideo; Osaki, Kenji; Watanabé, Tokunosuké (1963). "Crystal Structure of Cupric Benzoate Trihydrate Cu(C₆H₅COO)₂3H₂O". Journal of the Physical Society of Japan 18 (1): 117–124. doi:10.1143/JPSJ.18.117. Bibcode: 1963JPSJ...18..117K.

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Original source: https://en.wikipedia.org/wiki/Copper benzoate. Read more

[JPharma-1] 1.0 ^1.1 ^1.2 ^1.3 "Copper Benzoate SDS". Dr. J. Pharmachem Pvt. Ltd.. https://www.jpharmachem.com/content/uploads/2023/12/copper-benzoate-msds.pdf.

[SigmaAldrich-2] 2.0 ^2.1 Sigma-Aldrich Co., Benzoic acid, copper (II) salt dihydrate.

[3] "Formulas For Firework Stars Using Copper Benzoate" (in en). https://www.skylighter.com/blogs/how-to-make-fireworks/copper-benzoate-blue-fireworks-stars.

[4] "Approved and Prohibited Fireworks Chemicals". US Department of Transportation. https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/approvals-and-permits/hazmat/energetic-materials-approvals/18306/list-approved-and-prohibited-fireworks-chemicals.pdf.

[5] Wells, A. F. (1984). Structural inorganic chemistry (5th ed.). Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press. ISBN 0-19-855370-6.

[6] Kawata, T.; Uekusa, H.; Ohba, S.; Furukawa, T.; Tokii, T.; Muto, Y.; Kato, M. (1 June 1992). "Magneto-structural correlation in dimeric copper(II) benzoates". Acta Crystallographica Section B Structural Science 48 (3): 253–261. doi:10.1107/S0108768191012697.

[7] Koizumi, Hideo; Osaki, Kenji; Watanabé, Tokunosuké (1963). "Crystal Structure of Cupric Benzoate Trihydrate Cu(C₆H₅COO)₂3H₂O". Journal of the Physical Society of Japan 18 (1): 117–124. doi:10.1143/JPSJ.18.117. Bibcode: 1963JPSJ...18..117K.

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Copper benzoate

Topic: Chemistry

Contents

Preparation

Uses

Structure

Related compounds

References