Raman Spectra of the Adducts of Reduced Species of [Fe4S4(SPh)4]2− and [Mo2Fe6S8(SPh)9]3− with Acetylene
Reduced species of [Fe4S4(SPh)4]2− and [Mo2Fe6S8(SPh)9]3− form adducts with acetylene (C2H2 or C2D2) in dry CH3CN with liberating a terminal PhS− ligand. The ν(C≡C) Raman band undergoes 45 to 70 cm−1 low frequency shifts upon coordination of acetylene to the clusters.