The di-endo-protonated cryptand (2,1,1)H22+ is formed by slow direct proton transfer from acids HA to (2,1,1)H+; the crystal structure of (2,1,1)H22+ as its diperchlorate salt is reported.
B. G. Cox, J. Murray-Rust, P. Murray-Rust, N. van Truong and H. Schneider, J. Chem. Soc., Chem. Commun., 1982, 377 DOI: 10.1039/C39820000377
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