In the crystal structure of the complex of benzo-27-crown-9 and guanidinium perchlorate (1 : 1) a complementary binding relationship between host and guest is found; all guanidinium hydrogen atoms are involved in hydrogen bonding to oxygen atoms of the macrocycle.
J. W. H. M. Uiterwijk, S. Harkema, J. Geevers and D. N. Reinhoudt, J. Chem. Soc., Chem. Commun., 1982, 200 DOI: 10.1039/C39820000200
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