COMPLEXES OF THE PLATINUM METALS WITH HYDRAZONES. PART I. PALLADIUM(II) COMPLEXES WITH 2-ACETYL-AND 2-BENZOYLPYRIDINE HYDRAZONES

Mono-ligand complexes derived from 2-acetylpyridine hydrazone (APH) and 2-benzoylpyridine hydrazone (BPH) have been prepared with palladium(II) salts. Their physical properties including molar conductance measurements and spectral (IR, 1H-nmr and d-d) data are discussed in terms of possible structural types and the nature of bonding. No bis-ligand complexes have been prepared. The ligands appear to coordinate in the solid state via both pyridine and methylene nitrogen atoms but a change of bonding mode appears to occur when the solid complexes are dissolved in DMSO. A paramagnetic green species has been reproducibly prepared from Li2PdCl4 and APH.