Cationic cobaltammines as anion receptors: Synthesis, characterization and X-ray structure of bis-(hexaamminecobalt(III)) tris-(hydrogenarsenate) tetrahydrate

Ritu Bala, Raj Pal Sharma, Rajni Sharma, Juan M. Salas, Miguel Quiros, William T. A. Harrison

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The orange coloured single crystals of bis-(hexaamminecobalt(Ill)) tris-(hydrogenarsenate) tetrahydrate, [Co(NH3)(6)](2)(HASO(4))(3)center dot 4H(2)O, have been prepared by reacting aqueous solutions of hexaamminecobalt(III) chloride with disodium hydrogenarsenate in 1: 1 molar ratio. The title complex salt was characterized by elemental analyses and spectroscopic studies (IR, UV/visible). X-ray crystal structure determination of the title complex salt revealed the presence of discrete ions, i.e., cation [Co(NH3)(6)](3+) and anion HASO(4)(2-) and four water molecules in the solid state. A strong network of hydrogen bond interactions (N-H center dot center dot center dot O (hydrogenarsenate), N-H center dot center dot center dot O (water), O-H center dot center dot center dot O (hydrogenarsenate)) stabilize the crystal lattice. The formation of definite salt and measurement of solubility products suggest that [Co(NH3)(6)](3+) may be used as an anion receptor for hydrogenarsenate anion. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)174-180
Number of pages7
JournalJournal of Molecular Structure
Issue number1-3
Publication statusPublished - 28 Feb 2007


  • anion receptor
  • cobalt(III)
  • coordination chemistry
  • second sphere coordination
  • spectroscopy
  • X-ray crystallography
  • 2nd-sphere coordination
  • convenient synthesis
  • crystal-structure
  • binding
  • monohydrate
  • complex
  • hydrogenarsenate
  • packing
  • solids
  • DNA

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