ИСТИНА

One of the important trends in supramolecular chemistry is the development of receptors, including Lewis acids, capable of selectively binding small anions, for example, by including them into their cavity. One of such receptors are anticrowns, some of them we have already studied. Recently we started research on a new example of anticrowns – non-planar biphenylene four-mercury macrocycle (o,o’-C6F4C6F4Hg)4 (1). In the course of our research it was shown that 1 is able to bind fluoride, bromide and even iodide anions with the formation of 1 : 1 complexes. There we report on syntheses and structures of unusual complexes of anticrown 1, {[(o,o’-C6F4C6F4Hg)4](η4-X–)} (X = F, Br, I), obtained by the interaction of 1 with various onium halides ([Bu4N]F.3H2O, [PyH]Br and [PPh4]I). These obtained halide complexes have a discrete structures where the anion is included inside the anticrown cavity and near symmetrically bound to all four Hg atoms of 1. It should be noted that the coordinated anions are located virtually in the mean plane of four mercury atoms of anticrown. It was previously shown that macrocycle 1 also has the ability to complexate the chloride anion.