Biologically important planar five-ring aromatic bases as their imidazolium and pyrazolium cations form crystalline 2:2 complexes with dibenzo-18-crown-6, creating one-dimensional arrays in a polar crystal lattice.
S. Kiviniemi, A. Sillanpää, M. T. Lämsä, J. Pursiainen, M. Nissinen and K. Rissanen, Chem. Commun., 1999, 897 DOI: 10.1039/A902014D
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