Three coreceptor molecules, two macrotetracycles 1 and 2 and one macropentacycle 3, containing -N204 macrocyclic and porphyrinic subunits, have been synthesized and characterized. They form metalloreceptors by complexation of transition-metal ions like Zn(II) or Cu(II) with the porphyrin groups. Binding of α,ω-diammonium cations to the -N204 units occurs with substrate inclusion, yielding η2-cryptates like 27, 28, and 31, as indicated by very large upfield shifts of the CH2 proton NMR signals of the substrates. Similarly, these organic cations also bind to the Zn(II)-containing metalloreceptors 19, 20, and 22, giving organic/inorganic mixed substrate supermolecules, such as 29, 30, and 32. In these and similar species, the simultaneous complexation of several substrates opens the way to the study of mutual interactions within supramolecular structures and of regulation effects on physical and chemical properties.
ASJC Scopus subject areas
- Colloid and Surface Chemistry