Novel C3v-Symmetrical N7-Hexahomotriazacalix[3]cryptand:: A highly efficient receptor for halide anions

We report the synthesis of a novel C v-symmetrical N-7-hexahomotriazacalix[3]cryptand (1). Compound 1 was shown to be in a fixed cone conformation by H-1 NMR spectroscopy and X-ray single-crystal structure determination. Complexation studies showed that 1 is a selective receptor for halide ions. The effects of zinc metal cation on the receptor (1-Zn2+) upon anion recognition are also shown.