Copper(II) tetrafluoroborate

Copper(II) tetrafluoroborate[1]

Names
IUPAC name

Copper(II) tetrafluoroborate

Identifiers

CAS Number

* 14735-84-3 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 21241480 Y

PubChem CID

* 170058

InChI

* InChI=1S/2BF4.Cu.H2O/c2*2-1(3,4)5;;/h;;;1H2/q2*-1;+2; Y

Key: JYLPBVRGTDBGBM-UHFFFAOYSA-N Y

* InChI=1/2BF4.Cu.H2O/c2*2-1(3,4)5;;/h;;;1H2/q2*-1;+2;

Key: JYLPBVRGTDBGBM-UHFFFAOYAF

SMILES

* [Cu+2].F[B-](F)(F)F.F[B-](F)(F)F.O

Properties

Chemical formula

| Cu(BF4)2
Molar mass | 237.155 g/mol
Appearance  | blue crystal

Solubility in water

| soluble in water
Hazards
NIOSH (US health exposure limits):

PEL (Permissible)

| TWA 1 mg/m3 (as Cu)[2]

REL (Recommended)

| TWA 1 mg/m3 (as Cu)[2]

IDLH (Immediate danger)

| TWA 100 mg/m3 (as Cu)[2]
Related compounds

Other anions

| Copper(II) chloride
Copper(II) oxide
Copper(II) triflate

Other cations

| Sodium tetrafluoroborate
Lithium tetrafluoroborate
Silver tetrafluoroborate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)
Infobox references

Tracking categories (test):

* SizeSet

Copper(II) tetrafluoroborate is any inorganic compound with the formula Cu(H2O)x(BF4)2. As usually encountered, it is assumed to be the hexahydrate (x = 6), but this salt can be partially dehydrated to the tetrahydrate.[3] Regardless, these compounds are aquo complexes of copper in its +2 oxidation state, with two weakly coordinating tetrafluoroborate anions.

The compound is used in organic synthesis, e.g. as a Lewis acid for Diels Alder reactions, for cyclopropanation of alkenes with diazo reagents, and as a Lewis Acid in Meinwald Rearrangement reactions on Epoxides.[4] In the former two applications, the copper(II) is reduced to a copper(I) catalyst.[3][5] The compound is also used for copper electroplating in fluoroborate-based plating baths.[6]

## References

1. ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), CRC Press, pp. 4–56, ISBN 0-8493-0594-2
2. ↑ 2.0 2.1 2.2 NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0150.html.
3. ↑ 3.0 3.1 Ilhyong Ryu, Noboru Sonoda, "Copper(II) Tetrafluoroborate" Encyclopedia of Reagents for Organic Synthesis 2001, John Wiley & Sons. doi:10.1002/047084289X.rc249
4. ↑ Robinson, Mathew W.C.; Pillinger, Kathryn S.; Graham, Andrew E. (August 2006). "Highly efficient Meinwald rearrangement reactions of epoxides catalyzed by copper tetrafluoroborate". Tetrahedron Letters 47 (33): 5919–5921. doi:10.1016/j.tetlet.2006.06.055.
5. ↑ Copper(II) Tetrafluorborate, chemicalland21.com
6. ↑ Barauskas, Romualdas "Ron" (January 1, 2000). "Copper plating" (in en). Metal Finishing 98 (1): 234–247. doi:10.1016/S0026-0576(00)80330-X. ISSN 0026-0576. https://doi.org/10.1016/S0026-0576(00)80330-X. Retrieved July 21, 2022.

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Copper compounds

Cu(0,I)|

* Cu5Si

Cu(I)|

* CuBr
* CuCN
* CuCl
* CuF
* CuH
* CuI
* Cu2C2
* Cu2Cr2O5
* Cu2O
* CuOH
* CuNO3
* Cu3P
* Cu2S
* CuSCN

Cu(I,II)|

* Cu3H4O8S2

Cu(II)|

* Cu(BF4)2
* CuBr2
* CuC2
* CuCO3
* Cu(CN)2
* Cu(ClO3)2
* CuCl2
* CuF2
* Cu(NO3)2
* Cu3(PO4)2
* Cu(N3)2
* CuO
* CuO2
* Cu(OH)2
* CuI2
* CuS
* CuSO4
* Cu3(AsO4)2

Cu(III)|

* K3CuF6
* Cu2O3

Cu(IV)|

* Cs2CuF6
* Rb2CuF6

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Tetrafluoroborates

* AgBF4
* Ba(BF4)2
* C7H7BF4
* Cd(BF4)2
* CsBF4
* Cu(BF4)2
* [Et3O]BF4
* [FeCp2]BF4
* HBF4
* (IPy2)BF4
* KBF4
* LiBF4
* [Me3O]BF4
* NaBF4
* NH4BF4
* NOBF4
* NO2BF4
* (FTEDA)BF4
* Zn(BF4)2

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