A sulfide ion at the center of an Ni6 prism capped by two additional Ni atoms, and the presence of nine μ2-StBu bridges are the characteristic features of the structure of 1. The mean oxidation state for nickel in diamagnetic 1 is + 1.25. The anion 1 is the first pure nickel–sulfur complex with nickel in an unusual oxidation state. With the sterically less demanding thiolato ligand iPrS⊖, on the other hand, the neutral complex 2 containing Ni2⊕ is formed.
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Krüger et al. (1989) studied this question.
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