Abstract

The only known discrete transition metal sulfur cluster [Mo 3S 13] 2− has been investigated spectroscopically (XPS, UV/VIS, IR and Raman) and by a cyclovoltammetric study. It turns out that the cluster consists of three Mo atoms with the oxidation state +IV and six S 2− 2 ligands. A simplified MO treatment of the metal system in [Mo 3S 13] 2− explains the diamagnetism of the compound, as well as the single bond character of the MoMo bonds. The two absorption bands in the visible region are due to a transition within the Mo 3 metal system and the charge transfer transitions π * v(S 2− 2) → d(Mo).

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