Diboron tetrafluoride

Summary

Diboron tetrafluoride
Stick model of diboron tetrafluoride
Space-filling model of the diboron tetrafluoride molecule
Names
Preferred IUPAC name
Diboron tetrafluoride
Systematic IUPAC name
Tetrafluorodiborane
Identifiers
  • 13965-73-6
3D model (JSmol)
  • Interactive image
ChemSpider
  • 123165
  • 139653
  • DTXSID80161143 Edit this at Wikidata
  • InChI=1S/B2F4/c3-1(4)2(5)6
    Key: WUWOPJNIAKTBSJ-UHFFFAOYSA-N
  • FB(F)B(F)F
Properties
B2F4
Molar mass 97.616 g/mol
Appearance Colorless gas
Density 4.3 kg/m3 (gas)
Melting point −56 °C (−69 °F; 217 K)
Boiling point −34 °C (−29 °F; 239 K)
Thermochemistry
79.1 J/mol K
317.3 J/mol K
-1440.1 kJ/mol
-1410.4 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Diboron tetrafluoride is the inorganic compound with the formula (BF2)2. A colorless gas, the compound has a halflife of days at room temperature. It is the most stable of the diboron tetrahalides.[1]

Structure and bonding

Diboron tetrafluoride is a planar molecule with a B-B bond distance of 172 pm.[1] Although it is electron-deficient, the unsaturated boron centers are stabilized by pi-bonding with the terminal fluoride ligands. The compound is isoelectronic with oxalate.

Synthesis and reactions

Diboron tetrafluoride can be formed by treating boron monofluoride with boron trifluoride at low temperatures, taking care not to form higher polymers.[2]

Addition of diboron tetrafluoride to Vaska's complex was employed to produce an early example of a transition metal boryl complex:[3]

2 B2F4 + IrCl(CO)(PPh3)2 → Ir(BF2)3(CO)(PPh3)2 + ClBF2

Historical literature

  • Louis Trefonas and William N. Lipscomb (1958). "Crystal and Molecular Structure of Diboron Tetrafluoride, B2F4". J. Chem. Phys. 28 (1): 54–55. doi:10.1063/1.1744079.
  • Gayles, J. N.; Self, J. (1964). "Infrared Spectrum of Diboron Tetrafluoride in the Gaseous and Solid States". Journal of Chemical Physics. 40 (12): 3530–3539. doi:10.1063/1.1725048.
  • Arthur Finch and Hermann Irving Schlesinger (1958). "Diboron Tetrafluoride". J. Am. Chem. Soc. 80 (14): 3573–3574. doi:10.1021/ja01547a020.
  • A. K. Holliday; F. B. Taylor (1964). "Diboron tetrafluoride. Part II. Reactions with some oxides and organometallic compounds". J. Chem. Soc.: 2731–2734. doi:10.1039/JR9640002731.
  • Vernon H. Dibeler; Susan K. Liston (1968). "Mass-spectrometric study of photoionization. XII. Boron trifluoride and diboron tetrafluoride". J. Chem. Soc. 7 (9): 1742–1746. doi:10.1021/ic50067a010.

References

  1. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  2. ^ P. L. Timms (1972). Low Temperature Condensation. Advances in Inorganic Chemistry and Radiochemistry. p. 143. ISBN 0-12-023614-1.
  3. ^ Neeve, Emily C.; Geier, Stephen J.; Mkhalid, Ibraheem A. I.; Westcott, Stephen A.; Marder, Todd B. (2016). "Diboron(4) Compounds: From Structural Curiosity to Synthetic Workhorse". Chemical Reviews. 116 (16): 9091–9161. doi:10.1021/acs.chemrev.6b00193. PMID 27434758.


External links

  • Diboron tetrafluoride at webelements