Bárbara Tirloni

Synthesis and crystal structure of chalcogenide cluster compound

Three new cluster compounds were synthesized from Hg(EPh) 2 (E = Se, Te; Ph = phenyl) in organic solvents. Two of these compounds, [Hg 2 Cl 2 (SePh) 2 (PCy 3 ) 2 ], (1), and [Hg 2 Br 2 (SePh) 2 (PCy 3 ) 2 ], (2), were prepared by reaction of Hg(SePh) 2 , HgX 2 (X = Cl, Br) and tricyclohexylphosphine, PCy 3 , in dimethylformamide. The reaction of Hg(TePh) 2 with HgBr 2 in tetrahydrofuran using triphenylphosphine or 2,2’-bipyridine as co-ligands gave the polymeric cluster [{Hg 5 Br 3 (TePh) 7 } n ] (3), whose dissolution in dimethylsulfoxide yielded the cluster [Hg 3 Br 3 (TePh) 3 ]∙2dmso. The influence of different ligands, coordinating solvents and reaction stoichiometries on the formation of the title compounds is also discussed. All complexes were characterized by elemental analysis, thermogravimetric analysis and single crystal X-ray diffractometry.

Synthesis and structural chemistry of CoII, CuII, CuI and PdII complexes containing a flexible monoselenoether ligand

Monoselenoether ligand [PySeCH2Py] (L) reacts with CoCl2, CuCl2, CuI and Pd(OAc)2 resulting in the formation of molecular or polymeric complexes. The synthesis and structural elucidation of the complexes [CoCl2(L)] (1), [Cu2Cl4(L)2] (2a), [CuCl2(L)] (2b), [Cu2Cl2(PySe)2] (2c), [Cu(2-PyCOO)2] (2d), [Cu2I2(L)2] (3), [Cu2I2(L)]n (4) and [Pd2(CH3COO)2(PySeCHPy)2]·7H2O (5) demonstrate the versatility of this class of pyridylselenium ligands. For all compounds, the ligand offers N and/or Se atoms as donors and, in the case of 5, the ligand also builds C–Pd bonds to generate a cyclometallated palladium(II) complex.