Synthesis and examination of receptors, which are able to bind different kinds of molecules, are one of the main purposes of supramolecular chemistry [1]. Synthesis of anion receptors is an especially demanding task due to larger size, variety of shapes and low charge density of anions comparing to cations. One of the ways to solve these problems is a design of the tweezer-like receptors which are flexible enough to adjust their structure to guests of various sizes and shapes. An interesting application of anion receptors is formation of optical sensors, especially those able to give visible response in the presence of anions [2].

Simple and efficient way of synthesis of both macrocyclic 1 and open-chained 2 tweezer-like molecules will be presented. Modular structure of this type compounds is easy modifiable and allows to incorporate an array of various groups. Compounds bearing nitro groups change color in the presence of anions. Binding properties of obtained receptors were examined by ¹H NMR titrations with three typical anions - Cl^-, PhCOO^-, and H₂PO₄^-. Binding constants, obtained in DMSO by this method, vary from 10 to 10³.

[1] F. P. Schmidtchen, M. Berger, Chem. Rev. 1997, 97, 1609-1646.

[2] K. Choi, A. D. Hamilton, Coord. Chem. Rev. 2003, 240, 101-110.

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