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Stabilizing effects of large counter ion: Synthesis, characterization and single crystal X-ray structure determination of [Co(NH3)6][HgI4]I·H2O

✍ Scribed by Raj Pal Sharma; Ajnesh Singh; Paloth Venugopalan; Anton I. Smolentsev; Alexander I. Gubanov

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
588 KB
Volume
975
Category
Article
ISSN
0022-2860

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✦ Synopsis

In an attempt to synthesize [Co(NH 3 ) 6 ][Hg 2 I 7 ], a new cobalt(III) complex salt, [Co(NH 3 ) 6 ][HgI 4 ]IÁH 2 O (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 ] 2À , one I À anions and one lattice water molecule. The crystal structure of complex salt, consist of a bilayered structure demonstrating ''rosette structure" arrangements involving NAH. . .I and NAH. . .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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