Chemical and structural studies of some transition metal tellurite complexes with 1,3-diaminopropane

Complexes of some Co(II), Ni(II), and Cu(II) tellurites with 1,3-diamino-propane ligand have been prepared and charaterized on the basis of elemental analyses, conductivity, magnetic moments, and spectral studies. These complexes have the general formula [MLn(H2O)(x)] TeO3 . yH(2)O, where M(II) = Co(II), Ni(II), and Cu(II); L = 1,3-diamino-propane; n = 3 [for Co(II)] and 2 [for Ni(II) and Cu(II)]; x = 0 [for Co(II) and Cu(II)] and 2 [for Ni(II)]; y = 4, 1 or 6 [for Co(II), Ni(II), and Cu(II) complexes, respectively]. TGA studies have also been carried out to study the patterns of their decomposition. The lattice constants and other cell parameters of the cobalt(II), nickel(II), and copper(II) tellurite complexes have been determined with the help of x-ray powder diffraction data. The Co(II) and Ni(II) complexes have an orthorhombic unit cell, whereas the Cu(II) complex has a tetragonal unit cell. On the basis of the cell parameters and diffraction data it has been concluded that the Co(II), Ni(II), and Cu(II) complexes have good crystallinity and packing efficiency.