Pérez-Torralba, Claramunt and colleagues show how two tautomers linked by two hydrogen bonds display a very fast intermolecular double proton transfer in the solid state (ISSPT).
Fast degenerate double proton transfer in the solid state between two indazolinone tautomers
Marta Pérez-Torralba, Concepción López, Carlos Pérez-Medina, Rosa M. Claramunt, Elena Pinilla, M. Rosario Torres, Ibon Alkorta and José Elguero
CrystEngComm, 2010, 
DOI: 10.1039/c0ce00249f
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