Blackman AG, Jelley RE, Krenske EH, Gahan LR, Bernhardt PV. Does H
3O
+ Really Act as a Ligand in the Solid State?
Inorg Chem 2021;
60:13071-13079. [PMID:
34424671 DOI:
10.1021/acs.inorgchem.1c01485]
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Abstract
The evidence for the existence of metal complexes containing H3O+ as a ligand in the solid state is examined. Each of the 68 examples in the Cambridge Structural Database in which H3O+ is bound to a transition metal, lanthanoid, actinoid, or main group metal ion is detailed and critically appraised. It is concluded that none of the reported examples of complexes containing coordinated H3O+ have been unequivocally characterized and that they result from either curation errors or misinterpretations of the crystallographic data. These conclusions are supported by computational techniques, which show that three purported H3O+ complexes based on the 1,4,7,10,13,16,21,24-octa-azabicyclo(8.8.8)hexacosane azacryptand skeleton are better described as aqua complexes, with protonation occurring at the amine ligand.
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