Synthesis and spectroscopic characterization of palladium(II) complexes with 6,8-dimethylimidazo[1,5-a]-1,3,5-triazin-4(3H)-one and 6,8-dimethyl-2-thioxo-2,3-dihydroimidazo-[1,5-a]-1,3,5-triazin-4(1H)-one Abstract The preparation and spectroscopic study ( 1 H, 13 C, 15 NNMR, 13 CP MAS NMR, IR) of new Pd II complexes with 6,8-dimethylimidazo[1,5-a]-1,3,5-triazin-4(3H)-one (6,8-DiMe-4-O-IMT) (1) and 6,8-dimethyl-2-thioxo-2,3-dihydroimidazo[1,5-a]-1,3,5-triazin-4(1H)-one (6,8-DiMe-4-O-2-S-IMT) (2) is reported. The spectroscopic data indicate a square planar geometry with two N(7) bonded heterocycles and two cis-chloride anions. The final product of the thermal decomposition of cis-PdCl 2 (6,8-DiMe-4-O-IMT) 2 (3) is metallic Pd, whereas for cis-PdCl 2 (6,8-DiMe-4-O-2-S-IMT) 2 (4) it is metallic Pd plus C.