Researchers have predicted, using computer simulations, a hypothetical molecule in which two positrons bind three hydride anions. The proposed three-centre, two-positron bond has not been made or observed experimentally; it is a result of calculations reported by Jorge Charry and coauthors in 2022.
What is the predicted molecule?
The system is written as 2e+[H3^3−]: three hydride anions, each carrying a negative charge, associated with two positrons. A positron is the positively charged antiparticle of an electron. In this proposal, the two positrons play the bonding role that two electrons play in a conventional three-centre bond.
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Charry and coauthors reported the prediction in “The three-center two-positron bond,” published in Chemical Science in 2022. Their calculations used quantum Monte Carlo simulations to investigate the system’s bonding and stability. The Royal Society of Chemistry paper record identifies the article as volume 13, page 13795.
How does a two-positron bond compare with an ordinary bond?
A familiar reference is Li3+, the trilithium cation. The researchers reported that the calculated bonding density in the proposed hydride-and-positron system resembles that of Li3+, an electronic three-centre, two-electron analogue. The comparison describes a similarity in bonding density; it does not mean the two species are the same substance or that either has been experimentally confirmed in this context.
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Was the molecule made or observed?
No experimental sample or observation is reported in the available account. Chemistry World describes the species as hypothetical and the result as a computational prediction. The paper’s conclusions should therefore be read as theoretical evidence about a possible bound arrangement, not as a report of a newly synthesized molecule.
What does “stable” mean here?
In calculations of unusual positron-bound species, stability is assessed relative to possible breakup products, or dissociation thresholds. A system can be stable against one specified breakup channel without that alone establishing stability against every possible channel. A 2024 peer-reviewed study of other positron-bonded molecular dianions discusses this threshold-dependent issue; its results concern different systems and should not be treated as additional calculations of the three-hydride, two-positron proposal. The 2024 paper provides that broader methodological context.
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Is the proposed molecule metallic?
The 2022 report presents possible metallic character as speculation, not as a measured or established property. The prediction’s central result is the proposed three-centre, two-positron bonding arrangement.
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