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Unreported Coordination Behavior of A Squaric Bis (Hydrazone) Ligand

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Author Affiliations

  • 1Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, EGYPT

Res.J.chem.sci., Volume 1, Issue (4), Pages 109-116, July,18 (2011)

Abstract

A compartmental tetrabasic hexadentate ligand (HL) -has two symmetrical NNO sets of donor atoms- was synthesized by the condensation of squaric acid with a hydrazino triazine compound. The reaction of the ligand with Pd(II), Fe(III), Co(II), Ni(II), Cu(II), VO(II) and UO(II)- ions afforded mono- and binuclear as well as dimeric complexes. The ligational behavior of the ligand is highly affected by the type of the metal ion and its counter anion. The isolated complexes reflect the structural diversity (pentagonal bipyramid, octahedral, square pyramid and square planar) as well as the versatile coordination bonding modes. The size of the cation has proved to be of importance in directing the synthetic pathway. Structural elucidation of the isolated complexes was achieved via elemental and thermal analyses as well as spectral studies.

References

  1. Shishkina S. V., Baumer V. N., Shishkin O. V., Tatarets A. L. and Patsenker L. D., Molecular and crystal structure of 3-butoxy-4-(1,3,3-trimethyl-2,3-dihydro-1- 2-indolylidenemethyl)-3-cyclobutene-1,2-dione and its thio analog, Journal of Structural Chemistry, 46, 154-158 (2005)
  2. Ucar I., Polymeric nickel(II) squarate complexes with imidazole derivatives: syntheses, crystal structures, spectroscopic and voltammetric studies, J.Coord. Chem., 61, 2590-2600 (2008)
  3. Ucar I., Bulut A., Büyükgüngö r O. KaradaA., Dinuclear cobalt and manganese squarate complexes with bidentate n-donor ligand: syntheses, crystal structures, spectroscopic, thermal and voltammetric studies, Transition Metal Chem., 31,1057–1065 (2006)
  4. Assefa W., Raju V.J.T., Chebude Y. and Retta N., Dinuclear metal complexes derived from a bis-chelating heterocyclic ligand, Bull. Chem. Soc. Ethiop.,23, 187-196 (2009)
  5. Erer H, Yesilel O.Z. and Büyükgüngö r O., One-dimensional coordination polymers of Co(II) and Cd(II)-squarate with 2-methylimidazole and 4(5)-methylimidazole ligands, Polyhedron, 29, 1163–1167 (2010)
  6. Mautner F.A., Albering J.H., Vicente R., Louka F.R., Gallo A.A. and Massoud S.S., Copper(II) complexes derived from tripodal tris[(2-ethyl-(1-pyrazolyl)]amine, Inorganica Chimica Acta, 365 ,290-296 (2011)
  7. Nuss H., Jansen M., Crystal structure of diaquabis(ethylenediamino) copper(II) squarate dihydrate, [Cu(C(HO)](C)· 2HO, Z. Kristallogr, NCS, 225, 773-774 (2010)
  8. Seleem H.S., Ramadan A.A.T., Taha A., Eid M.F. and Samy F.: The complexation of a novel squaric bis(thiosemicarbazone); 3,4 bis{[(aminothioxomethyl)amino]azamethylen}cyclobut-ene-1,2-diol, Spectrochimica Acta (A), 78,1097-1104 (2011)
  9. Ramadan A.A.T and Seeda M.H, Complexing properties of 3,4-dihydroxycyclobut-3-ene-1,2-dione bis(5,6-diphenyl-1,2,4-triazin-3-ylhydrazone) with copper, nickel, cobalt and dioxouranium ionsJ. Chem. Research (M), 1717-1734 (1994)
  10. El-Gammal O.A. and El-Asmy A.A., Synthesis and spectral characterization of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide and its metal complexes, J. Coord. Chem., 61, 2296–2306 (2008)
  11. Jones L.H. Systematics in the vibrational spectra of uranyl complexes, Spectrochimica Acta, 10, 395-403 (1958)
  12. Veal B.W., Lam D.J., Carnall W.T., Hoekstra H.R. and X-Ray photoemission spectroscopy study of hexavalent uranium compounds, Phys. Rev. B., 12, 5651–5663 (1975)
  13. Khan O., Molecular Magnetism, VCH, New York (1993)
  14. Massoud S.S., Mautner F.A, Vicente R. Dickens J.S., Squarato-metal(II) complexes. 1, structural and magnetic characterization of squarato-bridged dinuclear nickel(II) and copper(II) complexes, Inorganica Chimica Acta, 361, 299–308 (2008)
  15. Jones C. J., d- and f- Block Chemistry Polestar Wheatons Ltd, UK (2001)
  16. Seleem H. S., El-Inany G.A., El-Shetary B.A.,Mousa M., Hanafy F.I., The ligational behavior of an isatinic quinolyl hydrazone towards copper(II)- ions, Chemistry Central Journal,:20 (2011)
  17. Bencini A., Gattechi D., EPR of Exchange Coupled Systems, Springer-Verlach, Berline. (1990)