X-ray crystallographic studies of a Mn(II)-bridged biscalix[4]arene with a large inner cavity

Iki Hideshi, Hirohisa Tsuzuki, Seiji Shinkai

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Abstract

A complex isolated from a mixture of tetrasodium 5, 11, 17, 23-tetrasulfonatocalix [4]arene-25, 26, 27, 28-tetrol and Mn(II) has been analyzed by X-ray crystallography. The crystal packing diagram featured a clay-like bilayer structure as reported previously for the analogous crystals. Interestingly, Mn(II) ions present in the hydrophilic layer cross-link two hydrophobic layers through coordination to the sulfonato groups. Because of this complex formation the repeat unit of the layer (12.1 A) is shorter than those for analogous systems (13.7-15.0 A).The structure features a Mn(II)-bridged biscalix[4]arene with a large inner cavity. X-Ray crystallographic and ESR spectral data show that Mn(II) ions adopt a distorted octahedral coordination geometry with two sulfonato groups occupying the cis coordination. This is a novel coordination mode for a metal-bridged biscalix[4]arene in the solid state.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalSupramolecular Chemistry
Volume4
Issue number3
DOIs
Publication statusPublished - Dec 1 1994

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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