Synthesis, characterization and spectral studies of triethanolamine complexes of metal saccharinates. Crystal structures of [Co(TEA)(2)](SAC)(2) and [Cu-2(mu-TEA)2(SAC)(2)]center dot 2(CH3OH)

Y Topcu, O Andac, V T Yilmaz, W T A Harrison

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Abstract

The novel transition metal saccharinate complexes of triethanolamine (TEA) have been synthesized and characterized by elemental analyses, magnetic moments, LTV-Vis and IR spectra. Mn(II), Co(II), Ni(II), Zn(II), Cd(II) and Hg(II) form mononuclear complexes of [M(TEA)(2)](SAC)(2), where SAC is the saccharinate ion, while the Cu(II) complex is dimeric. The TEA ligand acts as a tridentate N,O,O'-donor ligand and one ethanol group is not involved in coordination. The SAC ion does not coordinate to the metal ions and is present as the counter-ion in the Mn(II), Co(II), Ni(II), Zn(II), Cd(II) and Hg(II) complexes, but coordinates to the Cu(II) ion as a monodentate ligand. The crystal structures of the [Co(TEA)(2)](SAC)(2) and [Cu-2(mu-TEA)(2)(SAC)(2)].2(CH3OH) complexes were determined by single crystal x-ray diffraction. The Co(II) ion has a distorted octahedral coordination by two TEA ligands. The Cu(II) complex crystallizes as a dimethanol solvate and has doubly alkoxo-bridged centrosymmetric dimeric molecules involving two tridentate triethanolaminate (deprotonated TEA) and two monodentate SAC ligands. The geometry of each Cu(II) ion is a distorted square pyramid. Both crystal structures are stabilized by hydrogen bonds to form a three-dimensional network.

Original languageEnglish
Pages (from-to)805-815
Number of pages11
JournalJournal of Coordination Chemistry
Volume55
DOIs
Publication statusPublished - 2002

Keywords

  • saccharin complexes
  • triethanolamine complexes
  • crystal structures
  • THERMAL-PROPERTIES
  • CU(II)
  • <M(C7H4NO3S)2(H2O)4>.2H2O
  • DIETHANOLAMINE
  • TRANSITION
  • CO(II)
  • NI(II)

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