1,3-pyrimidinyl(2,4,6-pyrimidine trione) and its metal chelates

Summary A new tetradentate ligand 1,3-pyrimidinyl(2,4,6-pyrimidine trione) and its chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) complexes have been prepared and characterized by elemental analysis, magnetic susceptibility measurements, and electronic and i.r. spectra. Conductivity measurements show the complexes to be non-electrolytes. An octahedral geometry for trivalent ions iron(III) and chromium(III)] has been proposed, whereas all divalent metal ions, except for copper(II), appear to be tetrahedral. The 10 Dq values suggest that the ligand is as strong as ethylenediamine. The values indicate a considerable orbital overlap in the metal-ligand bond.