Lithium monoxide anion

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 459445215

| ImageFile =

| ImageFile2 =

| ImageSize = 240

| IUPACName = Lithium monoxide anion

| OtherNames = Lithate

|Section1={{Chembox Identifiers

| CASNo = 64538-53-0

| CASNo_Ref ={{cite web |title=Lithium oxide anion |url=https://webbook.nist.gov/cgi/formula?ID=C64538530 |website=webbook.nist.gov |language=en}}

| SMILES = [Li]-[O-]

| StdInChI=1S/Li.O/q;-1

| StdInChIKey = IXZJKKSRIFXCQD-UHFFFAOYSA-N

}}

|Section2={{Chembox Properties

| Li=1|O=1|Formula_Charge=-

| ConjugateAcid = Lithium hydroxide

}}

|Section3={{Chembox Hazards

| MainHazards = Extremely corrosive

}}

|Section4={{Chembox Related

| OtherFunction_label = bases

| OtherFunction = {{unbulleted list|

• Methyl anion
• Diethynylbenzene dianions

}}

}}

}}

Lithium monoxide anion ({{chem2|LiO−}}) is a superbase existing in the gas phase. It was the strongest known base until 2008, when the isomeric diethynylbenzene dianions were determined to have a higher proton affinity. The methanide ion {{chem2|CH3−}} was the strongest known base before lithium monoxide anion was discovered.{{cite journal |last1=Poad |first1=Berwyck L. J. |last2=Reed |first2=Nicholas D. |last3=Hansen |first3=Christopher S. |last4=Trevitt |first4=Adam J. |last5=Blanksby |first5=Stephen J. |last6=Mackay |first6=Emily G. |last7=Sherburn |first7=Michael S. |last8=Chan |first8=Bun |last9=Radom |first9=Leo |title=Preparation of an ion with the highest calculated proton affinity: ortho-diethynylbenzene dianion |journal=Chemical Science |date=2016 |volume=7 |issue=9 |pages=6245–6250 |doi=10.1039/C6SC01726F |pmid=30034765 |pmc=6024202 |doi-access=free}}

{{chem2|LiO−}} has a proton affinity of ~1782 kJ/mol.{{Cite journal|date=6 February 2016|doi=10.1016/j.cplett.2016.02.010|title=OLi₃O^– anion: Designing the strongest base to date using OLi₃ superalkali|last1=Srivastava|first1=Ambrish Kumar|last2=Misra|first2=Neeraj|journal=Chemical Physics Letters|volume=648|pages=152–155|bibcode=2016CPL...648..152S}}