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Synthesis and Spectroscopic Studies of 14-Membered Dithiadiaza Macrocyclic Complexes of Transition Metal Ions

Khan T. A., Naseem S.

Polish Journal of Chemistry

2009

Vol. 83, nr 11

1885-1892

A new series of 14-membered macrocyclic complexes containing nitrogen and sulfur donor atoms have been synthesized by metal template condensation reactions of 1,2-ethane -dithiol, omikron-bromoaniline and succinic or phthalic acid in 1:2:1 molar ratio in metha nol. The proposed stoichiometry and the bonding of the macrocyclic moiety to metal ions along with the over all stereochemistry have been derived from the results of elemental analyses, magnetic susceptibility, conductivity data and the spectral data revealed from FT-IR, 1H NMR, UV-visible and EPR spectral studies. The molar conductance measurements of the complexes in DMSO correspond to be none-electrolyte nature for Co(II) and Zn(II) while 1:2 electrolyte for Ni(II) and Cu(II) complexes. Thus, these complexes may be formulated as [ML1X2] and [ML2X2] (M = Co(II), or Zn(II); X = Cl or NO3), and [ML1]X2 and [ML2]X2 (M = Ni(II) or Cu(II); X = Cl or NO3). On the basis of IR, electronic and EPR spectral studies an octahedral geometry has been as signed for Co(II) and Zn(II) complexes while square-planarfor Ni(II) and Cu(II) complexes.

Template Synthesis of 16-Membered Octaazamacrocyclic Complexes of Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) Ions

Khan T., Ghani S., Tabassum S.

Polish Journal of Chemistry

2006

Vol. 80, nr 9

1449-1455

Template condensation of the metal ions with hydrazine, 2,4-pentanedione and acetaldehyde in a 1:4:2:2 molar ratio resulted in the formation of a new series of 16-membered octaazamacrocyclic complexes: dichloro/nitrato [2,5,8,10,13,16-hexamethyl-3,4,6,7,11, 12,14,15-octaazacyclohexadecane-2,7,10,15-tetraene)metal(II)], [MLX2] (M = Fe(II), Co(II), Ni(II), Cu(II) and Zn(II); X = Cl or NO3). The overall geometry and stereochemistry of the complexes have been characterized by elemental analyses, IR, 1HNMR, EPR, UVvisible, magnetic susceptibility and conductivity measurements. An octahedral geometry is suggested for all of the complexes. The conductivity data suggest that the complexes are non-ionic in nature.