CCA-2770 Original Scientific Paper Synthesis and Characterization of Metallocyclic Complexes of Palladium(II) with

The synthesis, spectroscopic and thermal properties of the novel five-membered N,O metallocyclic complexes of palladium(II) with monoethyl (HL1) and monobutyl (HL2) esters of (-anilino-N-benzyl)phosphonic acid are reported. Binuclear complexes Pd2L4 (L = L1, L2) were obtained by reaction of sodium salts of monoalkyl phosphonates with PdCl42 – in aqueous solution. Four organophos-phorus ligands bridge two palladium atoms by coordination through the aniline nitrogen and the deprotonated phosphonic acid oxygen. The complexes were identified and characterized by elemental analysis, magnetic and conductance measurements, as well as by spectroscopic (ESI-MS, IR, UV-VIS, 1H and 31P NMR) and thermal (TG, DTA) studies. The properties of the complexes are discussed with respect to those of palladium(II) metallocyclic complexes re-ported for monoalkyl 4-azobenzene-substituted anilinobenzylphos-phonates. Key words: palladium(II) complex, metallocycle, sodium anilino-benzylphosphonate, aminophosphonate complex, spectroscopy, ther-mal decomposition