The reaction of cobalt(II), nickel(II), copper(II) chlorides and bromides with 3-thiophene aldehyde thiosemicarbazone (3TTSCH) leads to the formation of a series of new complexes: [Co(3TTSC) 2 ], [Ni(3TTSC) 2 ], [CuCl(3TTSC)] 2 , [CuBr(3TTSC)] 2 and [CuBr 2 (3TTSCH)]. The crystal structures of the free ligand and of the compound [Ni(3TTSC) 2 ] have been determined by X-ray diffraction methods. For all these complexes, the central ion is coordinated through the sulfur and the azomethine nitrogen atom of the thiosemicarbazone. [Co(3TTSC) 2 ], [Ni(3TTSC) 2 ] and [CuBr 2 (3TTSCH)] are mononuclear species, while [CuCl(3TTSC)] 2 and [CuBr(3TTSC)] 2 are binuclear complexes.