The hydrido complex [FeH₆]⁴‾ has Oh symmetry. The bonding in [FeH₆]^4– can be described in terms of the interactions between the atomic orbitals of Fe and the LGOs of the H₆-fragment.

(a) Derive the six LGOs of the H₆ fragment, showing clearly how you determine their symmetries.

(b) The basis set for the Fe atom consists of valence 3d (see Fig. 1.12), 4s and 4p orbitals. Determine the symmetries of these orbitals under O_h symmetry.

(c) Construct an MO diagram for the formation of [FeH6]⁴‾ from Fe and the H6-fragment, showing which MOs are occupied. Comment on the characters of the MOs. How does this bonding picture differ from that described for SF₆ in Fig. 5.28?

Figure 1.12.

Figure 5.28.

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