Second sphere coordination complexes: Synthesis, characterization, single crystal structure and packing analyses of trans-Cu(en)2(H2O)22 where L1=p-toluenesulphonate, L2=5-bromo-2-methoxybenzenesulphonate (original) (raw)

Two new copper(II) complexes of composition [trans-Cu(en) 2 (H 2 O) 2 ](L 1 ) 2 , 1 and [trans-Cu(en) 2 (H 2 O) 2 ](L 2 ) 2 , 2 (L 1 = p-toluenesulphonate, L 2 = 5-bromo-2-methoxybenzenesulphonate) were obtained by the addition of ethylenediamine to hydrated Cu(II) sulphonates, Cu(L 1 /L 2 ) 2 ÁnH 2 O in methanol-water solution. The newly synthesized complex salts have been characterized by elemental analyses, TGA, spectroscopic techniques (electronic and FT-IR), magnetic moment determination and conductance measurements. The complex salt 1 crystallizes in the monoclinic system with space group P2 1 /c and complex salt 2 crystallizes in the triclinic system with space group P 1. X-ray structure determination revealed ionic structures consisting of one complex cation [Cu(en) 2 (H 2 O) 2 ] 2+ and two respective sulphonate anions in 1 and 2. A three dimensional hydrogen bonding network formed by N-H. . .O, C-H. . .O and O-H. . .O through second sphere interactions besides electrostatic forces of attraction stabilize crystal lattice in both complex salts.