Toward Elusive Iodoplumbic Acid HPbI3: High-Energy Isochoric Synthesis of Hydronium Forms of the PbI3- Anion at Elevated Temperature and Pressure

05 April 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


High-pressure and -temperature crystallization and X-ray diffraction crystallography have revealed hydronium forms of the proposed but never demonstrated iodoplumbic acid HPbI3. Depending on the pressure range, the reaction of PbI2 and aqueous concentrated hydriodic acid under isochoric conditions in a diamond anvil cell (DAC) held between 0.11 and 1.20 GPa produces two hydrated hydronium salts with compositions [H3O][PbI3].nH2O (n=3,4). Comprised of polymeric one-dimensional PbI3- anions, these hydronium salts represent the so far best match for the elusive HPbI3 progenitor of hybrid lead perovskites. We also reveal a new three-dimensional polymorph of lead iodide (PbI2), so far known only as a layered structure.


high-pressure chemistry
lead halide perovskites
iodoplumbic acid

Supplementary materials

SupportingInfo ChemRxiv


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