Abstract
Two easy-to-synthesize polypyrrolic 2,5-diamidothiophene Schiff base macrocycles are reported, along with their anion binding properties as determined via UV-vis spectroscopic titrations carried out in dichloroethane. There is a striking difference between the interactions with anions of the two macrocycles, a finding ascribed to differences in their rigidity. For example, the more flexible dipyrromethane-derived macrocycle displays a 1.2:1 hydrogen sulfate versus nitrate selectivity, while its more rigid bipyrrole-derived congener shows a 7.4:1 selectivity in favor to hydrogen sulfate.
Original language | English |
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Pages (from-to) | 5277-5280 |
Number of pages | 4 |
Journal | Organic Letters |
Volume | 7 |
Issue number | 23 |
DOIs | |
Publication status | Published - 10 Nov 2005 |