Binding of arylsulphonates by cationic cobalt(III) complex: Syntheses, characterization and single crystal structure determination of [Co(phen)2CO3](arylsulphonate)•nH2O

In an effort to study the binding of substituted arylsulphonates by cationic cobalt(III) complex [Co(phen)(2)-CO3](+), two complex salts [Co(phen)(2)CO3](4-chlorobenzenesulphonate)center dot 3H(2)O, 1 and [Co(phen)(2)CO3] (2,4-dinitrobenzenesulphonate)center dot H2O, 2 have been synthesized. These complex salts were characterized by elemental analysis, solubility product, conductivity measurements, thermal and spectroscopic studies. The crystal structures of 1 and 2 have been determined by single-crystal X-ray structure determination. Both complex salts, crystallize in triclinic system (space group Pi) with cell dimensions a = 10.215(5) angstrom, b = 12.013(5) angstrom, c = 12.822(5) angstrom, alpha = 69.497(5), beta = 88.855(5), gamma = 78.430(5)degrees, Z = 2, V = 1441.6(11) angstrom(3) for 1 and a = 7.730(5) angstrom, b = 13.958(5) angstrom, c = 14.020(5) angstrom, alpha = 73.763(5), beta = 88.352(5), gamma = 81.035(5)degrees, Z = 2, V = 1434.5(11) angstrom(3) for 2. The hydrogen bonding (C-H center dot center dot center dot O and O-H center dot center dot center dot O) and pi-pi stacking interactions result in the formation of bi-layered and zig-zag structures in 1 and 2 respectively. The facile formation of complex salts with small K-sp values and detailed packing analysis suggests that the [Co(phen)(2)CO3](+) complex ion may be effective as a binding agent for substituted arylsulphonates in an aqueous medium. (C) 2012 Elsevier B.V. All rights reserved.