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Copper benzoate

Copper benzoate

| | (dihydrate) }} | | (dihydrate) |Sodium benzoate |Potassium benzoate

Copper benzoate is the chemical compound with the formula . These coordination complexes are derived from the cupric ion and the conjugate base of benzoic acid. Many derivatives are known with diverse ancillary ligands. It has found some niche use as a combination fuel and source of copper ion for blue light production 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: :

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.

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.

Structure

Structure of one form of copper(II) benzoate.

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, 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.

References

References

  1. "Copper Benzoate SDS". Dr. J. Pharmachem Pvt. Ltd..
  2. {{Sigma-Aldrich
  3. "Formulas For Firework Stars Using Copper Benzoate".
  4. "Approved and Prohibited Fireworks Chemicals". US Department of Transportation.
  5. (1984). "Structural inorganic chemistry". Clarendon Press; Oxford University Press.
  6. (1 June 1992). "Magneto-structural correlation in dimeric copper(II) benzoates". Acta Crystallographica Section B Structural Science.
  7. (1963). "Crystal Structure of Cupric Benzoate Trihydrate Cu(C6H5COO)23H2O". Journal of the Physical Society of Japan.
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