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

Abstract

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(H 2O) 2(NO 3) 4] 2 or [Cd 2(L) 3(H 2O) 2(NO 3) 4] 3. In the reacting system the crystals of meso isomer 1 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) Å, β=94.898(9)°, V=1857.7(15) Å 3, Z=4, final refinement ( I>2 σ( I)): R1=0.0659, w R2=0.1415. Crystal data for 2: triclinic, space group P–1, a=9.242(4), b=9.539(4), c=21.042(9) Å, α=83.888(9), β=87.971(8), γ=74.177(9)°, V=1774.6(13) Å 3, Z=2, final refinement ( I>2 σ( I)): R1=0.0577, w R2=0.0954. Crystal data for 3: triclinic, space group P–1, a=9.203(4), b=9.831(3), c=20.860(7) Å, α=84.313(6), β=86.432(7), γ=74.188(6)°, V=1805.9(11) Å 3, Z=2, final refinement ( I>2 σ( I)): R1=0.0548, w R2=0.1192.