Copper(II) tetrafluoroborate
Chemical compound / From Wikipedia, the free encyclopedia
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.
Names | |
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IUPAC name
Copper(II) tetrafluoroborate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.049.037 |
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
Cu(BF4)2 | |
Molar mass | 237.155 g/mol |
Appearance | blue crystal |
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).
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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]