Structural chemistry of dihalogenopalladium(II) and platinum(II) complexes of heteroleptic N,S- and N,Se-donor ligands based on the 2-organochalcogenomethylpyridine motif

► The chemistry of Pd(II) and Pt(II) is explored for heteroleptic bidentate ligands. ► 6-Methyl substituents on pyridines, or iodo ligands at Pd, affect structures. ► Mononuclear PdX2N2, binuclear and trinuclear structures are described.