Multi-receptor oligomers, macrocycles, cages, and polypendent Ru(II) complexes were investigated as host molecules in a series of spectrophotometric complexation studies with alkali, alkaline earth, and main group metal guest ions. The binding affinities of the host systems were determined by UV-visible, fluorescence, and 1H NMR titration experiments. The systems under investigation displayed binding affinities that were consistent with a fit concept, where the larger ions bound more preferentially to a larger host and the smaller ions preferred the smaller host molecule. These systems show promise as selective sensors for the presence of various alkaline earth and main group metal guests based on a charge to size ratio of host and guest. The uncomplexed host transition metal systems were characterized using 1H NMR spectroscopy and by both MALDI-TOF and ESI mass spectrometry. The ion-encapsulated host-guest systems were characterized by ESI mass spectrometry, UV-visible and fluorescence spectroscopy, and by 1H and 13C NMR spectroscopies.

Multireceptor host-guest complexation studies of novel ruthenium(II) ethylene-oxide oligomers, poylamine macrocycles, and tripodal cage complexes

249th National Meeting (2015)

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