A ternary tetracoordinated PdII complex with metformin and dipicolinate: Synthesis, characterization and crystal structure

A proton transfer compound L, (MetH)2(dipic), (dipicH2 = 2,6-pyridinedicarboxylic acid and Met = Metformin (N,N-dimethylebiguanidine), was synthesized and characterized by IR, 1H and 13C NMR spectroscopy. The reaction of L with PdCl2 in water results in the formation of novel tetracoordinated PdII complex [Pd(dipic)(Met)]·2H2O indicating the participation of both dipic2− and Met as chelating ligands. This complex was characterized by single crystal X-ray analysis. The crystal system is monoclinic with space group P21/c. The unit cell dimensions for PdII complex 1 is a = 8.8619(14) Å, b = 9.5072(9) Å, c = 19.153(3) Å.