Potassium tetraphenylborate

Potassium tetraphenylborate
Names
Preferred IUPAC name
Potassium tetraphenylboranuide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.156.375 Edit this at Wikidata
  • InChI=1S/C24H20B.K/c1-5-13-21(14-6-1)25(22-15-7-2-8-16-22,23-17-9-3-10-18-23)24-19-11-4-12-20-24;/h1-20H;/q-1;+1 checkY
    Key: MAMCUZQNCMYPCY-UHFFFAOYSA-N checkY
  • InChI=1/C24H20B.K/c1-5-13-21(14-6-1)25(22-15-7-2-8-16-22,23-17-9-3-10-18-23)24-19-11-4-12-20-24;/h1-20H;/q-1;+1
    Key: MAMCUZQNCMYPCY-UHFFFAOYAU
  • [K+].c1c(cccc1)[B-](c2ccccc2)(c3ccccc3)c4ccccc4
Properties
C24H20BK
Molar mass 358.3249
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Potassium tetraphenylborate is the salt with the formula KB(C6H5)4). It is a colourless salt that is a rare example of a water-insoluble salt of potassium.

The salt has a low solubility in water of only 1.8×10−4 g/L. It is, however, soluble in organic solvents. The insolubility of this compound has been used to determine the concentration of potassium ions by precipitation and gravimetric analysis:[1]

K+ + NaB(Ph)4 → KB(Ph)4 + Na+

The compound adopts a polymeric structure with bonds between the phenyl rings and potassium. As such it is classified as an organopotassium compound.[2]

References

  1. ^ Engelbrecht, R. M.; McCoy, F. A. (1956). "Determination of Potassium by Tetraphenylborate Method". Anal. Chem. 28 (11): 1772. doi:10.1021/ac60119a040.
  2. ^ Ulrich Behrens, Frank Hoffmann, and Falk Olbrich "Solid-State Structures of Base-Free Lithium and Sodium Tetraphenylborates at Room and Low Temperature: Comparison with the Higher Homologues MB(C6H5)4 (M = K, Rb, Cs)" Organometallics 2012, volume 31, p. 905−913. doi:10.1021/om200943n


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