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	{{chembox		{{chembox
	| verifiedrevid = 419122196		| verifiedrevid = 450711461
			| Name =
	| ImageFile =
			| ImageFile = ]
	| ImageSize =		| ImageSize = 100px
	| IUPACName = Boron(I) oxide
			| IUPACName = oxoboron
	| OtherNames = Di-boron monoxide
	| Section1 = {{Chembox Identifiers		| Section1 = {{Chembox Identifiers
			| CASNo_Ref = {{cascite|correct|CAS}}
	| CASNo = 12045-60-2
	| PubChem =		| CASNo = 12505-77-0
	| SMILES = }}		| ChEBI = 30162
			| ChemSpiderID = 4885722
⚫	| Section2 = {{Chembox Properties
			| UNII_Ref = {{fdacite|correct|FDA}}
⚫	| Formula = B<sub>2</sub>O
			| PubChem = 6327189
⚫	| MolarMass = 37.621 g/mol
			| UNII = 0IDJ8AZ8DG
⚫	| Appearance =
			| StdInChI=1S/BO/c1-2
⚫	| Density =
			| StdInChIKey = MOWNZPNSYMGTMD-UHFFFAOYSA-N
⚫	| MeltingPt =
	| BoilingPt =		| SMILES1 = O=BB=O
			| SMILES2 = =O
			| SMILES3 = O1B2B1O2
			}}
		⚫	| Section2 = {{Chembox Properties
		⚫	| Formula = BO
		⚫	| MolarMass = 26.81 g/mol
		⚫	| Appearance = white powder
		⚫	| Density =
		⚫	| MeltingPt =
			| BoilingPt =
	| Solubility = }}		| Solubility = }}
	| Section3 = {{Chembox Hazards		| Section7 = {{Chembox Hazards
	| MainHazards =		| MainHazards =
	| FlashPt =		| FlashPt =
	| Autoignition = }}		| AutoignitionPt = }}
	}}		}}
			'''Boron monoxide''' (BO) is a binary compound of ] and oxygen. It has a molar mass of 26.81 g/mol. The material was first reported in 1940,<ref name=":0">{{Cite journal |last1=Zintl |first1=E. |last2=Morawietz |first2=W. |last3=Gastinger |first3=E. |date=1940-10-03 |title=Bormonoxyd |url=https://onlinelibrary.wiley.com/doi/10.1002/zaac.19402450102 |journal=Zeitschrift für anorganische und allgemeine Chemie |language=de |volume=245 |issue=1 |pages=8–11 |doi=10.1002/zaac.19402450102 |issn=0863-1786}}</ref> with a modified synthetic procedure published in 1955,<ref name=":1">{{Cite journal |last1=Wartik |first1=Thomas |last2=Apple |first2=Eugene F. |date=1955-12-01 |title=A New Modification of Boron Monoxide |url=https://pubs.acs.org/doi/abs/10.1021/ja01628a116 |journal=Journal of the American Chemical Society |language=en |volume=77 |issue=23 |pages=6400–6401 |doi=10.1021/ja01628a116 |bibcode=1955JAChS..77.6400W |issn=0002-7863}}</ref> 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,<ref name=":2">{{Cite journal |last1=Claeyssens |first1=Frederik |last2=Allan |first2=Neil L. |last3=Norman |first3=Nicholas C. |last4=Russell |first4=Christopher A. |date=2010-09-30 |title=Design of three-dimensional solid-state boron oxide networks: Ab initio calculations using density functional theory |url=https://link.aps.org/doi/10.1103/PhysRevB.82.094119 |journal=Physical Review B |volume=82 |issue=9 |pages=094119 |doi=10.1103/PhysRevB.82.094119|bibcode=2010PhRvB..82i4119C }}</ref><ref>{{Cite journal |last1=Li |first1=Da-Zhi |last2=Bai |first2=Hui |last3=Chen |first3=Qiang |last4=Lu |first4=Haigang |last5=Zhai |first5=Hua-Jin |last6=Li |first6=Si-Dian |date=2013-06-28 |title=Perfectly planar boronyl boroxine ''D''<sub>3''h''</sub> B<sub>6</sub>O<sub>6</sub>: A boron oxide analog of boroxine and benzene |journal=The Journal of Chemical Physics |volume=138 |issue=24 |pages=244304 |doi=10.1063/1.4811330 |issn=0021-9606|doi-access=free |bibcode=2013JChPh.138x4304L }}</ref><ref>{{Cite journal |last1=Liu |first1=Y. |last2=Liu |first2=C. |last3=Pu |first3=L. |last4=Zhang |first4=Z. |last5=King |first5=R. B. |date=2017-03-14 |title=Boron monoxide dimer as a building block for boroxine based buckyballs and related cages: a theoretical study |url=https://pubs.rsc.org/en/content/articlelanding/2017/cc/c6cc09489a |journal=Chemical Communications |language=en |volume=53 |issue=22 |pages=3239–3241 |doi=10.1039/C6CC09489A |pmid=28256640 |issn=1364-548X}}</ref> but these were difficult to differentiate using common structural characterization methods. Recent work suggests that the material forms 2D nanosheets composed of O-bridged B<sub>4</sub>O<sub>2</sub> rings, a structure initially postulated in 1961.<ref name=":3">{{Cite journal |last1=McCloskey |first1=A. L. |last2=Brotherton |first2=R. J. |last3=Boone |first3=J. L. |date=December 1961 |title=The Preparation of Boron Monoxide and its Conversion to Diboron Tetrachloride<sup>1</sup> |url=http://dx.doi.org/10.1021/ja01484a015 |journal=Journal of the American Chemical Society |volume=83 |issue=23 |pages=4750–4754 |doi=10.1021/ja01484a015 |bibcode=1961JAChS..83.4750M |issn=0002-7863}}</ref><ref>{{Cite journal |last=Perras |first=Frédéric A. |date=June 28, 2023 |title=The Structure of Boron Monoxide |url=https://pubs.acs.org/doi/10.1021/jacs.3c02070 |journal=J. Am. Chem. Soc. |volume=145 |issue=27 |pages=14660–14669 |doi=10.1021/jacs.3c02070 |bibcode=2023JAChS.14514660P |osti=1992674 |via=ACS Publications}}</ref> Due to the lack of precise structural information on the identity of the compound, it has not found widespread use in industry.
	'''Boron monoxide''' (B<sub>2</sub>O) is a chemical compound of ] and oxygen. Two experimental studies have proposed existence of diamond-like <ref>
	{{cite journal
			== Synthesis ==
	|last1=Endo |first1=T.
			Boron monoxide is typically produced through the condensation of ] (chemical formula; B<sub>2</sub>(OH)<sub>4</sub>) at temperatures of 200–500°C.<ref name=":1" /> The use of higher temperatures (700°C) leads to the formation of hard B<sub>2</sub>O<sub>3</sub> glasses. These glasses generally have a dark appearance, from the dissolved elemental boron, and are also produced directly through the dissolution of B into B<sub>2</sub>O<sub>3</sub>.<ref name=":0" />
	|last2=Sato |first2=T.
	|last3=Shimada |first3=M.
			BO has been used in the synthesis of ],<ref name=":3" /> which served as the only evidence, until 2010,<ref name=":2" /> of the preservation of the B–B bond present in the precursor compound.
	|year=1987
	|title=High-pressure synthesis of B<sub>2</sub>O with diamond-like structure
	|journal=]
	|volume=6 |issue=6 |pages=683
	|doi=10.1007/BF01770925
	}}</ref> and graphite-like <ref>
	{{cite journal
	|last1=Hall |first1=H. T.
	|last2=Compton |first2=L. A.
	|year=1965
	|title=Group IV Analogs and High Pressure, High Temperature Synthesis of B<sub>2</sub>O |url=http://67.50.46.175/pdf/19650231.pdf
	|journal=]
	|volume=4 |issue=8 |pages=1213
	|doi=10.1021/ic50030a027
	}}</ref> B<sub>2</sub>O, as for ] and ] solids. However, a later, systematic, experimental study of boron oxide phase diagram suggests that B<sub>2</sub>O is unstable.<ref>
	{{cite journal
	|last1=Solozhenko |first1=V. L.
	|last2=Kurakevych |first2=O. O.
	|last3=Turkevich |first3=V. Z.
	|last4=Turkevich |first4=D. V.
	|title=Phase Diagram of the B−B<sub>2</sub>O<sub>2</sub> System at 5 GPa: Experimental and Theoretical Studies
	|year=2008
	|journal=]
	|volume=112 |issue=21 |pages=6683–7
	|doi=10.1021/jp800625s
	|pmid=18457447
	}}</ref> The instability of the graphite-like B<sub>2</sub>O phase was also predicted theoretically.<ref>
	{{cite journal
	|last1=Grumbach |first1=M.
	|last2=Sankey |first2=O.
	|last3=McMillan |first3=P.
	|title=Properties of B<sub>2</sub>O: An unsymmetrical analog of carbon
	|year=1995
	|journal=]
	|volume=52 |issue=22 |pages=15807
	|bibcode=1995PhRvB..5215807G
	|doi=10.1103/PhysRevB.52.15807
	}}</ref>
	== See also ==		== See also ==
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	==References==		==References==
	{{reflist|2}}		{{reflist}}
			{{Boron compounds}}
	{{DEFAULTSORT:Boron Monoxide}}		{{DEFAULTSORT:Boron Monoxide}}