Mono- and di-nuclear nickel(II) complexes with mixed N/S-donor ligands: Syntheses, structures and physical properties

► Two new Ni(II) complexes with tridentate thiosemicarbazone ligands. ► Dinuclear Ni(II) complex of a SNS ligand adopting a butterfly-type structure. ► Deprotonated anionic thiolate-S and neutral thione-S coordination modes. ► First example of dinuclear bis(thiolate)-bridged Ni(II) complexes with NS3 coordination involving a thiosemicarbazide moiety.