Extended chains via hydrogen bond linkages of dinuclear copper(II) and cadmium(II) complexes with a new flexible disulfoxide ligand

A new flexible disulfoxide ligand 1,6-bis(benzylsulfinyl)hexane (L), which is a mixture of the meso and rac isomers, was treated with Cu-II or Cd-II nitrate and obtained dimeric complex [Cu-2(L)(3)(H2O)(2)(NO3)(4)] 2 or [Cd-2(L)(3)(H2O)(2)(NO3)(4)] 3. In the reacting system the crystals of meso isomer I of L together with 2 or 3 were obtained. 2 and 3 have similar molecular structures. In the neutral dimer, three ligands present two kinds of coordination models: monodentate and bis-monodentate. The neutral dimeric units in 2 and 3 are linked by hydrogen bonds to yield a chain structure. Crystal structures of all three compounds were determined by single-crystal X-ray diffraction methods. Crystal data for 1: monoclinic, space group Cc, a = 41.95(2), b = 5.132(2), c = 8.660(4) Angstrom, beta = 94.898(9)degrees, V = 1857.7(15) Angstrom(3), Z = 4, final refinement (I> 2sigma(I)): R1 = 0.0659, wR2 = 0.1415. Crystal data for 2: triclinic, space group P-1. a = 9.242(4), b = 9.539(4), c = 21.042(9) Angstrom, alpha = 83.888(9), beta = 87.971(8), gamma = 74.177(9)degrees, V = 1774.6(13) Angstrom(3), Z = 2, final refinement (I > 2sigma(I)): R1 = 0.0577, wR2 = 0.0954. Crystal data for 3: triclinic, space group P-1, a = 9.203(4), b = 9.831(3), c = 20.860(7) Angstrom, alpha = 84.313(6), beta = 86.432(7), gamma = 74.188(6)degrees, V = 1805.9(11) Angstrom(3), Z = 2, final refinement (I>2sigma(I)): RI = 0.0548, wR2 = 0.1192. (C) 2003 Elsevier Science (USA). All rights reserved.