Tetrathiomolybdate MoS 4 2 is tetrahedral and features a strong t1 e LMCT absorption at 470 nm (a) What color would you predict for (NH 4 ) 2 MoS 4 (b) What is the energy in eV of the LMCT transition and how does it compare with MoO 4 2 Why does the LMCT energy shift in the way that it does (c) The...

Figure 71 Equation 72 a Figure 71 shows that the MoS4 absorbs predominantly blue and ...

Tetrathiomolybdate MoS 4 2 is tetrahedral and features a strong t1 e LMCT absorption at 470

Question:

Tetrathiomolybdate MoS₄²⁻ is tetrahedral and features a strong t1 → e LMCT absorption at 470 nm.

(a) What color would you predict for (NH₄)₂MoS₄?

(b) What is the energy in eV of the LMCT transition and how does it compare with MoO₄²⁻? Why does the LMCT energy shift in the way that it does?

(c) The compound Li₃NbS₄•2TMEDA (TMEDA = tetramethylenediamine) features isolated NbS₄³⁻ tetrahedra. Do you expect the lowest-energy LMCT absorption peak of NbS₄³⁻ to occur at shorter or longer wavelengths than MoS₄²⁻? Explain your reasoning.