Synthetic procedures and structural features of new di- and tri-nuclear chelate compounds of Cd(II) with sulfur and nitrogen donor ligands

Cd(dmpymt)2 reacts with CdCl2, CdBr2·4H2O, CdI2, 2,2′-bipyridine and 1,10-phenanthroline to give the dimeric chelates [Cd(dmpymt)(bpy)Cl]2 and [Cd(dmpymt)(phen)Cl]2, as well as the tri-nuclear complexes [Cd3(dmpymt)4(bpy)2Br2] and [Cd3(dmpymt)4(bpy)2I2] (dmpymtH = 4,6-dimethylpyrimidine-2-thione; bpy = 2,2′-bipyridine; phen = 1,10-phenantroline). In all complexes the Cd(II) centers present the coordination number six. The new compounds are examples of the managing of the final aggregation state of thiolate metal complexes by introducing co-ligands to block specific coordination sites of the metal center.

Cd(dmpymt)2 + CdCl2, CdBr2·4H2O, CdI2, bpy and phen gives [Cd(dmpymt)(bpy)Cl]2, [Cd(dmpymt)(phen)Cl]2, [Cd3(dmpymt)4(bpy)2Br2] and [Cd3(dmpymt)4(bpy)2I2] (dmpymtH = 4,6-dimethylpyrimidine-2-thione; bpy = 2,2′-bipyridine; phen = 1,10-phenantroline). The introduction of co-ligands allows blocking specific coordination sites of the metal center.Figure optionsDownload as PowerPoint slide