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

Abstract

In an effort to study the binding of substituted arylsulphonates by cationic cobalt(III) complex [Co(phen)2CO3]+, two complex salts [Co(phen)2CO3](4-chlorobenzenesulphonate)⋅3H2O, 1 and [Co(phen)2CO3] (2,4-dinitrobenzenesulphonate)⋅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 P1¯) with cell dimensions a=10.215(5)Ǻ, b=12.013(5)Ǻ, c=12.822(5)Ǻ, α=69.497(5), β=88.855(5), γ=78.430(5)°, Z=2, V=1441.6(11)Ǻ3 for 1 and a=7.730(5)Ǻ, b=13.958(5)Ǻ, c=14.020(5)Ǻ, α=73.763(5), β=88.352(5), γ=81.035(5)°, Z=2, V=1434.5(11)Ǻ3 for 2. The hydrogen bonding (CH⋯O and OH⋯O) and π–π 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 Ksp values and detailed packing analysis suggests that the [Co(phen)2CO3]+ complex ion may be effective as a binding agent for substituted arylsulphonates in an aqueous medium.