Add time:08/20/2019         Source:sciencedirect.com

The reaction of 1,2-bis(diphenylthioylphosphino)hydrazine (L) with copper(I) and mercury(II) halides affords the complexes, [{CuLX}2] (X = I, Br or Cl), [HgLX2] (X = Cl or Br) and the tetrametallic complex, [{L(HgI2)2}2]. Single crystal X-ray structures have been performed on the uncoordinated ligand, L, as well as the complexes [{CuLX}2] (X = I, Br and Cl), [HgLBr2] and [{L(HgI2)2}2. The molecules of L exist as dimers as a result of pairs of N–H⋯S hydrogen bonds. The copper(I) complexes are centrosymmetric dimetallic species, the two copper atoms being bridged by L and the X atoms. In all cases the coordination sphere around the Cu atoms is approximately trigonal pyramidal with an ‘S2X2’ donor set. The complex, [HgLBr2], is a distorted tetrahedral monomer with an ‘S2Br2’ donor set and L acting as a bidentate thus forming a seven-membered chelate ring. The tetramercury iodo complex, [{L(HgI2)2}2], contains two ‘L(HgI2)2’ units linked centrosymmetrically via an I atom from each moiety. The geometry around the Hg atoms is distorted tetrahedral. The influence of hydrogen bonding between the hydrazine backbone hydrogens of L and the coordinated halide ions in for the structures of the metal complexes is discussed.

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