A neutral tridentate Schiff base, p-dimethylaminobenzal-dehyde-1,3-propanediamine, PPD, (the 1:1 molar condensation product of p-dimethylaminobenzaldehyde and 1,3-propanediamine) has been synthesized and characterised. The ligand, PPD, on interaction with the transition metal ions forms monoligand complexes of the general formula M(PPD)Clx.yH2O where M is the central metal atom and x = 4 in Pt and Ir, 3 in Ru and Rh, and 2 in the Pd, Cu, Cd, Hg, Mn and dioxouranium, y = 1 in case of Ir, Ru and Rh and y = O for all other complexes. The i.r. spectra reveal that the dimethylamino and free amino groups are the coordinating sites. The data comprising thermal studies show that the complexes are thermally stable. The magnetic moment, NMR and electronic spectral data show that the platinum(IV), iridium(IV), ruthenium(III) and rhodium(III) complexes are octahedral, whereas cadmium(II), mercury(II) and manganese(II) form complexes conforming the tetrahedral geometry. The copper(II) and palladium(II) complexes are found to be planar. The symmetry of the dioxouranium complex is, however, ambiguous.
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