Boron monoxide

Names
IUPAC name

oxoboron

Identifiers

CAS Number

* 12505-77-0 Y

3D model (JSmol)

* Interactive image
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PubChem CID

* 6327189

SMILES

* O=BB=O

* [B]=O

* O1B2B1O2

Properties

Chemical formula

| BO
Molar mass | 26.81 g/mol
Appearance  | white powder

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

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Infobox references

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Boron monoxide (BO) is a binary compound of boron and oxygen. It has a molar mass of 26.81 g/mol. The material was first reported in 1940,[1] with a modified synthetic procedure published in 1955,[2] however, the material's structure had remained unknown for nearly a century. A number of allotropes of BO have been theorized ranging from molecular species, to 1D, 2D, and 3D-structured materials,[3][4][5] but these were difficult to differentiate using common structural characterization methods. Recent work suggests that the material forms 2D nanosheets composed of O-bridged B4O2 rings, a structure initially postulated in 1961.[6][7] Due to the lack of precise structural information on the identity of the compound, it has not found widespread use in industry.

## Synthesis

Boron monoxide is typically produced through the condensation of tetrahydroxydiboron (chemical formula; B2(OH)4) at temperatures of 200–500°C.[2] The use of higher temperatures (700°C) leads to the formation of hard B2O3 glasses. These glasses generally have a dark appearance, from the dissolved elemental boron, and are also produced directly through the dissolution of B into B2O3.[1]

BO has been used in the synthesis of B2Cl4,[6] which served as the only evidence, until 2010,[3] of the preservation of the B–B bond present in the precursor compound.

## See also

* Boron suboxide
* Boron trioxide
* Boron

## References

1. ↑ 1.0 1.1 Zintl, E.; Morawietz, W.; Gastinger, E. (1940-10-03). "Bormonoxyd" (in de). Zeitschrift für anorganische und allgemeine Chemie 245 (1): 8–11. doi:10.1002/zaac.19402450102. ISSN 0863-1786. https://onlinelibrary.wiley.com/doi/10.1002/zaac.19402450102.
2. ↑ 2.0 2.1 Wartik, Thomas; Apple, Eugene F. (1955-12-01). "A NEW MODIFICATION OF BORON MONOXIDE" (in en). Journal of the American Chemical Society 77 (23): 6400–6401. doi:10.1021/ja01628a116. ISSN 0002-7863. https://pubs.acs.org/doi/abs/10.1021/ja01628a116.
3. ↑ 3.0 3.1 Claeyssens, Frederik; Allan, Neil L.; Norman, Nicholas C.; Russell, Christopher A. (2010-09-30). "Design of three-dimensional solid-state boron oxide networks: Ab initio calculations using density functional theory". Physical Review B 82 (9): 094119. doi:10.1103/PhysRevB.82.094119. https://link.aps.org/doi/10.1103/PhysRevB.82.094119.
4. ↑ Li, Da-Zhi; Bai, Hui; Chen, Qiang; Lu, Haigang; Zhai, Hua-Jin; Li, Si-Dian (2013-06-28). "Perfectly planar boronyl boroxine D3h B6O6: A boron oxide analog of boroxine and benzene". The Journal of Chemical Physics 138 (24): 244304. doi:10.1063/1.4811330. ISSN 0021-9606. https://doi.org/10.1063/1.4811330.
5. ↑ Liu, Y.; Liu, C.; Pu, L.; Zhang, Z.; King, R. B. (2017-03-14). "Boron monoxide dimer as a building block for boroxine based buckyballs and related cages: a theoretical study" (in en). Chemical Communications 53 (22): 3239–3241. doi:10.1039/C6CC09489A. ISSN 1364-548X. https://pubs.rsc.org/en/content/articlelanding/2017/cc/c6cc09489a.
6. ↑ 6.0 6.1 McCloskey, A. L.; Brotherton, R. J.; Boone, J. L. (December 1961). "The Preparation of Boron Monoxide and its Conversion to Diboron Tetrachloride1". Journal of the American Chemical Society 83 (23): 4750–4754. doi:10.1021/ja01484a015. ISSN 0002-7863. http://dx.doi.org/10.1021/ja01484a015.
7. ↑ Perras, Frédéric A. (June 28, 2023). "The Structure of Boron Monoxide". J. Am. Chem. Soc.. doi:10.1021/jacs.3c02070. https://pubs.acs.org/doi/10.1021/jacs.3c02070.

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Boron compounds

* BAs
* BBr3
* BCl3
* BF
* BF3
* BI3
* BN
* B(NO3)3
* B(OH)3
* BP
* BPO4
* B2F4
* B2Cl4
* B2H6
* BH3NH3
* B2O
* B2O3
* B2S3
* B4C
* B6O
* B5H9
* B5H11
* B6H10
* B6H12
* B10H14

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