M. J. Al-Jeboori, A. J. Abdul-Ghani, A. J. Al-Karawi
Aug 19, 2008
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Journal
Transition Metal Chemistry
Abstract
The new Mannich bases bis(1,4-diphenylthiosemicarbazide methyl) phosphinic acid H3L1 and bis(1,4-diphenylsemicarbazide methyl) phosphinic acid H3L2 were synthesised from the condensation of phosphinic acid, formaldehyde with 1,4-diphenyl thiosemicarbazide and 1,4-diphenylsemicarbazide, respectively. Monomeric complexes of these ligands, of general formulae K2[CrIII(Ln)Cl2], K3[MnII(Ln)Cl2] and K[M(Ln)] (M = Co(II), Ni(II), Cu(II), Zn(II) or Hg(II); n = 1, 2), are reported. The mode of bonding and overall geometry of the complexes were determined through physico-chemical and spectroscopic methods. These studies revealed octahedral geometries for the Cr(III), Mn(II) complexes, square planar for Co(II), Ni(II) and Cu(II) complexes and tetrahedral for the Zn(II) and Hg(II) complexes.