Cuboidal oxalate cluster complexes with the Mo3CuQ_4~(5+) cluster core (Q = S or Se): synthesis, structure, and electrochemical properties

摘要

The reactions of the [Mo3(μ3-Q)(μ2-Q)3(H2O)2(C2CO4)3]~(2-) complex (Q = S or Se) with CuX salts (X = Cl Br, I, or SCN) in water produce the cuboidal heterometallic clusters [Mo3(CuX)(μ3-Q)4(H2O)3(C2O)3]~(2-), which were isolated as the potassium and tetraphenyl-phosphonium salts. Two new compounds, K2[Mo3(CuI)(μ3-S)4(H2O)3(C2O4)3]·6H2O and (PPh4)2[Mo3(CuBr)(μ3-S)4(H2O)3(C2O4)3] ·7H2O, were structurally characterized. All compounds were characterized by elemental analysis and IR spectroscopy. The K2[Mo3(CuI)(μ3-Se)4(H2O)3(C2O4)3] compound was characterized by the ~(77)Se NMR spectrum; the (PPh4)2[Mo3(CuI)(μ3-S)4(H2O)3(C2O4)3], (PPh4)2[Mo3(CuI)(μ3-Se)4(H2O)3(C2O4)3] and K2[Mo3(CuSCN)(m-S)4(H2O)3(C2O4)3] · 7H2O compounds, by electrospray mass spectra.