Carbon-13 T1 relaxation time measurements show that the structures of 2,6-pyride crown ethers (1, n= 0–6) with ring sizes varying from 15 to 33 ring atoms and of two corresponding ‘encapsulated’ guanidinium perchlorate complexes in solution correspond to the structures in the solid state.
P. D. J. Grootenhuis, E. J. R. Sudhölter, C. J. van Staveren and D. N. Reinhoudt, J. Chem. Soc., Chem. Commun., 1985, 1426 DOI: 10.1039/C39850001426
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