Second-sphere coordination complex via hydrogen bonding: synthesis, characterization and X-ray crystal structure of hexaamminecobalt(III)chloride dimethanesulphonate, [Co(NH 3) 6]Cl(CH 3SO 3) 2

Abstract

The reaction of hexaamminecobalt(III)chloride with sodium salt of methanesulphonic acid in aqueous medium (1:3 molar ratio) leads to formation of hexaamminecobalt(III)chloride dimethanelsulphonate, [Co(NH 3) 6]Cl(CH 3SO 3) 2. This cobalt(III) complex has been characterized by elemental analyses and spectroscopic techniques (e.g. UV/Visible, IR and NMR). Single crystal X-ray structure determination of [Co(NH 3) 6]Cl(CH 3SO 3) 2 revealed supramolecular hydrogen bonding network between ionic groups (i.e. oxygen atoms of CH 3SO 3 − and Cl −) and NH group of coordinated NH 3 molecules, i.e. N–H⋯O and N–H⋯Cl − interactions resulting in bilayer formation, the bilayers being anchored by Cl − ions.