Keywords: Tellurium / Ligand design / Palladium / Platinum / Mercury / Solid-state structures N-[3-(Phenyltellanyl)propyl]picolinamide (HL1) or N-[NЈЈ,NЈЈ-methyl(phenyl)aminothiocarbonyl]-NЈ-[3-(phenyltellanyl)propyl]benzamidine (HL2) react with equivalent amounts of PtCl 2 or PdCl 2 with formation of neutral [MCl(L1-κN,NЈ,Te)] or [MCl(L2-κS,N,Te)] chelates. A corresponding reaction of HL2 with HgCl 2 results in the formation of [HgCl 2 (HL2-κS,Te)]. Treatment of [PtCl(L1-N,NЈ,Te)] with elemental iodine results in the exclusive oxidation of the metal [a] Scheme 2. Synthesis of HL1 and HL2.Both products were obtained as viscous oils, which could not be solidified even after several chromatographic purifi-Eur.