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Figure 6
The proton-transfer pressure for confirmed reactions in multicomponent crystals as a function of ΔpKa, marked with full circles and solid lines. Solid lines were used when not one specific pressure value was given (BIPYMA-1), or when the proton-transfer pressure was not reported (4MPYPCP). In the latter case, the whole investigated pressure range of the crystal was plotted. Open symbols and dotted lines (at 50% transparency) mark pressure ranges the selected multicomponent crystal structures deposited with the CSD were investigated in, and where the proton-transfer reaction was not observed. For details see Tables S6, S8 and S9. For PYAD, PYGLU, PYCUS, PYMA and PYOX, only ΔpKa for the first proton transfer was included as the ΔpKa for the second proton transfer is below −9 and falls outside the ΔpKa range considered in this work.

IUCrJ
Volume 11| Part 2| March 2024| Pages 168-181
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524000344