Second sphere coordination in anion binding: Synthesis, spectroscopic and X-ray structural study of [Co(phen)(3)](2)[Hg(SCN)(4)](3)center dot 3H(2)O

resumo

The complex salt [Co(phen)(3)](2)[Hg(SCN)(4)](3)center dot 3H(2)O was synthesized by mixing the separately dissolved tris(1,10-phenanthroline)cobalt(III) chloride, mercury(II) chloride and ammonium thiocyanate in aqueous medium in 2:3:12 molar ratio. The newly synthesized complex salt was characterized by elemental analyses, spectroscopic studies (IR, H-1, C-13 and Co-59 NMR). Single-crystal X-ray structure determination of [Co(phen)(3)](2)[Hg(SCN)(4)](3)center dot 3H(2)O revealed that the complex salt crystallizes in the monoclinic crystal system with space group P2(1)/n where a = 12.0150(4), b = 20.1916(5), c = 36.1151(9) angstrom, beta = 94.408(2)degrees, V = 8735.7(4) angstrom(3), Z = 4. The asymmetric unit consists of two complex cations, three anions and three lattice water Molecules. Crystal lattice is stabilized by hydrogen bonding interactions of type C-H...O, C-H...N through second sphere coordination and O-H...O interactions besides the electrostatic forces of attraction. The structural studies suggest that [Co(phen)(3)](3+) is a potential anion receptor for the [Hg(SCN)(4)](2-) ion. (C) 2009 Elsevier B.V. All rights reserved.

palavras-chave

MOLECULAR-STRUCTURE; COBALT(III) COMPLEX; METAL COMPLEXES; CRYSTAL; RECEPTORS; RECOGNITION; SPECTRA; SENSORS; TETRAFLUOROBORATE; THIOCYANATES

categoria

Chemistry

autores

Sharma, RP; Singh, A; Venugopalan, P; Brandao, P; Felix, V

nossos autores

agradecimentos

The authors gratefully acknowledges the financial support of CSIR vide Grant no 01(2020) 2005/EMR-II.

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