The development of neutral receptors for recognition of anions has attracted much attention in supramolecular chemistry during recent years. Although there are many remarkable achievements in this area,1 the design of the efficient and selective receptors is still a challenging task. We have recently been focused on tailored synthesis of simple, open-chain anion receptors of type 1-7, and on the relationship between their structure and complexation properties.2 In this communication we would like to present results of these studies. We successfully synthesized a series of receptors based on several building blocks such as 1H-pyrrole-2,5-dicarboxylic acid (1), pyridine-2,6-dicarboxylic acid (2), azulene-1,3-dicarboxylic acid (3), azulene-5,7-dicarboxylic acid (4), l,8-diamino-3,6-dichlorocarbazole (5), 1H-indole-7-amine (6), and 7,7'-diamino-2,2'-diindolylmethane (7).
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