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Supramolecular framework adducts constructed of hexamethylenetetramine, aquated alkali metal cationic clusters, and hexacyanoferrates(II/III)

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Abstract

The reaction of alkali metal hexacyanoferrate(II/III) with (CH2)6N4 (hexamethylenetetramine, abbreviated HMT) in an acidic medium yielded crystalline compounds of stoichiometries HK2[Fe111(CN)6]·2HMT·4H2O, H2K2[Fe11(CN)6]·2HMT·4H2O, and HNa2[Fe111(CN)6]· 2HMT·5H2O. Their crystal structures are based on a packing of three molecular components: neutral and/orprotonated HMT, hexacyanoferrate, and an alkali metal ion-water cluster. The resulting three-dimensional supramolecular framework is constructed from the coordination of the alkali metal ion by aqua ligands as well as [Fe(CN)6]{n−} and HMT units, and further stabilization is achieved by hydrogen bonding between water molecules and the noncoordinated nitrogen atoms of HMT and hexacyanoferrate.

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Correspondence to Thomas C. W. Mak.

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Xue, F., Mak, T.C.W. Supramolecular framework adducts constructed of hexamethylenetetramine, aquated alkali metal cationic clusters, and hexacyanoferrates(II/III). Struct Chem 7, 253–261 (1996). https://doi.org/10.1007/BF02254841

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Key words

  • Supramolecular framework adduct: crystal structure
  • hexamethylenetetramine
  • hexacyanoferrate