Preparation, Characterization and Molecular Models of Some Transition Metal Complexes of Tren [Tren = tris(2-aminoethyl)amine]

  • M. Q. Ehsan


Tris(2-aminoethyl)amine, tren, was reacted with Co(II), Ni(II), Cu(II) and Zn(II) in presence of NH3 and in presence of 4,4'- bipyridyl, separately in the aqueous medium. In all the preparations ClO4- ion was added as counter ion to get the solid product. The general formulae of the prepared complexes are [M(tren)NH3](ClO4)2 and [M(tren)(C10H8N2)](ClO4)2. Elemental analysis, IR, UV-visible spectral analysis have been used to characterize the compounds. From powder photographs d-values are reported. Molecular modelling of the compounds have been done to get idea about the structures. Bonding pattern of all the compounds indicate slightly distorted trigonal bipyramidal geometry. Because of steric hindrance of three five membered rings within metal and the ligand, tren, the equatorial plane of the trigonal bipyramid is inclined towards the tripodal ligand.