Abstract
In an attempt to synthesize [Co(NH 3) 6][Hg 2I 7], a new cobalt(III) complex salt, [Co(NH 3) 6][HgI 4]I·H 2O ( 1) was crystallized from a solution of hexaamminecobalt(III) bromide and potassium heptaiodatodimercurate(II) in aqueous medium in 1:1 M ratio. It has been characterized by elemental analyses, spectroscopic techniques (e.g. UV/visible, IR), solubility product and conductance measurements. The complex salt crystallizes in trigonal crystal system with space group R3c. Single crystal X-ray structure determination revealed the presence of discrete ions: [Co(NH 3) 6] 3+ cation, one [HgI 4] 2−, one I − anions and one lattice water molecule. The crystal structure of complex salt, consist of a bilayered structure demonstrating “rosette structure” arrangements involving N H…I and N H…O hydrogen-bond interactions through second sphere coordination. The crystal lattice is stabilized by these non-covalent interactions besides electrostatic interaction.
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