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In a 2018 study, researchers found that a proton attaches along an edge of white phosphorus’s tetrahedral P4 molecule—not at one of its four vertices. Spectroscopy and quantum-chemical calculations support a structure in which the proton bridges two phosphorus atoms, forming a three-center, two-electron P–H–P bond. The finding resolves the structure of this particular protonated species in solution; it does not establish an industrial process.
What protonated white phosphorus looks like
White phosphorus consists of tetrahedral P4 molecules. When the researchers protonated P4, the supported model for the resulting [P4H]+ species placed the hydrogen on an edge of that tetrahedron. The proton bridges two phosphorus atoms, and that edge opens as the framework rearranges.
This is an edge-protonated structure, rather than the alternative in which hydrogen attaches at an apex. The authors’ spectroscopic results agree with acid-mediated activation at an edge and formation of a three-center, two-electron P–H–P bond. The study’s published account describes the evidence and analysis.
How the researchers investigated the structure
Anja Wiesner, Simon Steinhauer, Helmut Beckers, Christian Müller, and Sebastian Riedel reported the work in Chemical Science in 2018. They used the aluminum-based Brønsted superacid system H[Al(OTeF5)4](solv) in ortho-difluorobenzene to protonate P4 and study [P4H]+ in solution. They compared spectroscopic results with quantum-chemical calculations.
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The combination matters: spectroscopy supports the proposed protonation behavior, while the detailed structural distances and relative energies discussed below are calculated values. They should not be read as direct crystallographic measurements of the species.
What the calculations say about the competing structures
The calculations favor an edge-protonated structure with C2v symmetry over the alternatives considered by the authors. In that model, the P···P distance along the proton-bridged edge is calculated to be 20.4 pm longer than the 221.8 pm P–P bond length reported for tetrahedral P4. The other P–P distances change less.
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The calculated apex-protonated minimum lies 61.4 kJ mol−1 above the edge-protonated minimum. Two other higher-energy alternatives are reported at 74.3 and 88.5 kJ mol−1 above it. These energy differences compare computed structures; they are not measured reaction yields or barriers.
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The authors also calculated proton affinities of 741.6 kJ mol−1 for ortho-difluorobenzene and 748.4 kJ mol−1 for P4 at the CCSD(T)/aug-cc-pVTZ level. Those values are theoretical results at that stated computational level, not experimental measurements.
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Why the result matters—and what it does not show
White phosphorus is described in the paper as the thermodynamically least stable and most reactive phosphorus allotrope at room temperature. The authors present the structural result as fundamental insight into P4 reactivity, with potential to inform further research into elemental phosphorus activation and functionalization by electrophiles. That is a research outlook, not evidence that a practical or commercial process has been developed.
The work concerns hazardous chemistry. The paper notes white phosphorus’s spontaneous flammability and severe toxicity. Its supplementary information says protonated white phosphorus is temperature-sensitive and tends to explode if isolated as a solid or warmed to room temperature in solution. This is specialized laboratory research, not a procedure to reproduce. The supplementary information gives the stability warning.
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Publication details
The article, “Protonation of white phosphorus P4 with the superacid H[Al(OTeF5)4](solv),” was first published on 23 August 2018 in Chemical Science, volume 9, pages 7169–7173. Its DOI is 10.1039/C8SC03023E. The PubMed Central archive provides an open-access copy. Chemistry World’s contemporaneous report framed the structural question as a choice between apex and edge protonation.
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