First X-ray structure of discrete anion [HgBr5](3-): Synthesis, characterization and single crystal X-ray structure determination of [Co(NH3)(6)][HgBr5]

abstract

A new cobalt(Ill) complex salt, [Co(NH3)(6)][HgBr5](1) was crystallized from a solution of hexaamminecobalt(III)bromide and potassium tetrabromomercurate(II) in aqueous medium in 1:1 molar ratio. This complex salt has been characterized by elemental analyses, spectroscopic techniques (e.g. UV/Visible, IR), solubility product and conductance measurements. The complex salt crystallizes in Orthorhombic crystal system with space group Pnma. Single crystal X-ray structure determination revealed the presence of discrete ions: [Co(NH3)(6)](3+) cation and a new anion [HgBr5](3-). This is the first structural report of a complex salt containing this new anion. The structure consists of stacks of cations and anions demonstrating supramolecular arrangements through N-H center dot center dot center dot Br hydrogen-bond interactions. The crystal lattice is stabilized by these non-covalent interactions besides electrostatic interaction. (C) 2009 Published by Elsevier B.V.

keywords

SENSORS; BINDING; RECOGNITION; RECEPTORS; METAL; FLUOROANION; TRANSITION; IONS

subject category

Chemistry

authors

Sharma, RP; Sharma, R; Kumar, A; Venugopalan, P; Brando, P; Felix, V

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