| 词条 | Lithium monoxide anion |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 459445215 | ImageFile = | ImageFile2 = | ImageSize = 240 | IUPACName = Lithium monoxide anion |Section1={{Chembox Identifiers | SMILES = [Li]-[O-] }} |Section2={{Chembox Properties | Formula = {{Chem|Li|O|-}} | ConjugateAcid = Lithium hydroxide }} |Section3={{Chembox Hazards | MainHazards = Extremely corrosive }} |Section4={{Chembox Related | OtherFunction_label = bases | OtherFunction = Meta-diethynylbenzene dianion Para-diethynylbenzene dianion Ortho-diethynylbenzene dianion }} }}Lithium monoxide anion (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. Ortho-diethynylbenzene dianion is the strongest base, followed by meta-diethynylbenzene dianion and para-diethynylbenzene dianion. The methyl anion CH3− was the strongest known base before lithium monoxide anion was discovered.[1] LiO− has a proton affinity of ~1782 kJ mol−1.[2] Synthesis of the Lithium Monoxide anionThe anion is prepared in a mass spectrometer by successive decarboxylation and decarbonylation of lithium oxalate anion under collision induced dissociation (CID) conditions: LiO(C=O)(CO2−) → LiOCO− + CO2, LiOCO− → LiO− + CO. The above method to synthesize Lithium monoxide anion is inefficient and difficult to carry out. The required ion rapidly reacts with traces of moisture and molecular Oxygen present in the air. The reaction is further intensified by the high pressure of Argon that is introduced into the instrument to carry out the CID step.[3] References1. ^{{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}} 2. ^{{Cite web|url=https://www.researchgate.net/publication/293480418|title=OLi3O− anion: Designing the strongest base to date using OLi3 superalkali|date=6 February 2016}} 3. ^{{Cite journal|last=Tian|first=Zhixin|last2=Chan|first2=Bun|last3=Sullivan|first3=Michael B.|last4=Radom|first4=Leo|last5=Kass|first5=Steven R.|date=2008-06-03|title=Lithium monoxide anion: A ground-state triplet with the strongest base to date|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=105|issue=22|pages=7647–7651|doi=10.1073/pnas.0801393105|issn=0027-8424|pmc=2409378|pmid=18511563}} See also
2 : Superbases|Lithium compounds |
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