Synthesis, characterization and crystal structures of palladium(II) complexes containing neutral, one and twofold deprotonated 1,2,4-triazine species

The synthesis and characterization of three new palladium(II) complexes of 4-amino-6-ethyl-1,2,4-triazine-3-thion-5-one (AETTO, H3L), [PdCl2(H3L)]·H2O (1), [Pd2Cl2(H2L)(PPh3)3]NO3·2CH3CN (2) and [Pd(HL)(PPh3)2] (3), are reported. All the synthesized compounds are air-stable and were characterized by elemental analyses, IR, NMR spectroscopy and mass spectrometry. In addition, the molecular structures of the complexes have been determined by X-ray single crystal diffraction. On the basis of the crystallographic data, the neutral ligand in 1 and the deprotonated ligands in 2 and 3 act as bidentate NS donors. The singly deprotonated ligand in 2 acts as a bridging agent between two metal centers in the binuclear PdII-complex.

The synthesis and characterization of three new palladium(II) complexes of 4-amino-6-ethyl-1,2,4-triazine-3-thion-5-one (H3L), [(H3L)PdCl2]·H2O (1), [(PPh3)2ClPd(H2L)Pd(PPh3)Cl]NO3·2CH3CN (2) and [(PPh3)2Pd(HL)] (3) are reported.Figure optionsDownload as PowerPoint slideHighlights
► New PdII-complexes containing neutral, one and twofold deprotonated 4-amino-6-ethyl-1,2,4-triazine-3-thion-5-one species.
► The corresponding ligand acts as a bidentate N,S-chelating one to the metal centers.
► The singly deprotonated triazine moiety acts as a bridge between two metal centers via its endocyclic nitrogen atom.
► The first example having twofold deprotonated 4-amino-6-ethyl-1,2,4-triazine-3-thion-5-one species.