CHELATING BEHAVIOUR OF 2,4,9,11-TETRAPHENYL-1,5,8,12- TETRAAZACYCLOTETRADECA -1,4,8,11-TETRAENE WITH SOME DIVALANT METALS LIKE Cu(II), Ni(II), Fe(II), Co(II) METAL IONS

Chemistry

The synthesis of the metal-ligand complex of Fe(II). Co(II), Ni(II), and Cu(II) of [2,4,9,11-tetraphenyl-1,5,8,12-tetraaza-cyclotetradeca-1,4,8,11 -tetraene] was made by using a method of, metal salt nitrate und1,3-diphenyl-1,3-propanedione. The electronic spectra confirmed the square planar geometry. The observed magnetic moment value of 5.2 B.M. for the complex under discussion suggested the tetrahedral geometry for the Fe (C34H32N4)(NO3)2. The electronic spectrum of cobalt complex Co(C34H32N4)(NO3)2 exhibited a very weak band in the near-infrared region at 1800 nm, which is characteristic of a square planar Co(II) species. This result was corroborated by its magnetic data (2.02 B.M.). The spectrum of the nickel complex displayed a relatively weak band at 560 nm with a shoulder at 500 nm. This low-intensity band was described as (d-d) transitions, in square planar complexes. Based on the analytical, spectral (IR, UV-visible), and magnetic data, it is inferred that the bonding of the metal ions takes place through aza group, and the ligand acts as neutral tetradentate.

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