Inorganic compounds containing the trifluoroacetate group. Part V. Mono- and di-adducts of binuclear molybdenum(II) trifluoroacetates

Molybdenum(II) trifluoroacetate adducts [Mo2(O2CCF3)4Xn]n–(n= 1, X = Cl, Br, I, O2CCF3, or SnCl3; n= 2, X = Br or I) have been synthesised and characterised by i.r., Raman, and u.v.–visible spectroscopy. The metal–metal stretching frequencies occur in the range 382–366 cm–1, that of a monoadduct being higher than that of the corresponding diadduct. The effect of addended ligands on the Mo–Mo bond in compounds of this type is discussed in the light of these and other data. The new substituted derivatives [Et4N]2[Mo2(O2CCF3)3Cl3] and [Et4N]4[Mo2(CN)8] have been characterised.