Abstract
Two new asymmetric ureidic receptors L1 (1-(1H-indol-7-yl)-3-(quinolin-2-yl)urea) and L2 (1-(quinolin-2-yl)-3-(quinolin-8-yl)urea) have been synthesised and their affinity towards different anions tested in DMSO-d6. L1 adopts both in solution and in the solid state an (E,Z) conformation. A moderate affinity for acetate has been observed for L1 while no interaction has been observed for L2. The different behaviour has been ascribed to the presence/absence of the indole group. In the case of L1 the indole group causes the formation of a peculiar supramolecular architecture with two molecules of the receptor binding the anions in the (E,Z) conformation via H-bonds. L2 also adopts an (E,Z) conformation in the solid state. However, the absence of the indole group in L2 hampers the formation of the supramolecular assembly with the participation of anionic species.
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