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A visible absorption spectrum of [ni(nh3)6]2+ has peaks at 365, 600 and 940 nm. Construct an Orgel diagram for nickel(ii) in an octahedral ligand field and use it to assign each observed peak to an electronic transition.
Accepted Answer
The Orgel diagram for nickel(II) in an octahedral ligand field shows that the d orbitals split into two sets: the lower energy t2g set (dxy, dyz, dzx) and the higher energy eg set (dx2-y2, dz2). The observed absorption peaks correspond to electronic transitions from the lower energy t2g orbitals to the higher energy eg orbitals. Here's the assignment:
365 nm: This peak corresponds to the 3A2g → 3T1g(P) transition, which involves excitation of an electron from the t2g to the eg set.
600 nm: This peak corresponds to the 3A2g → 3T1g(F) transition, which is a spin-allowed transition involving excitation of an electron from the t2g to the eg set.
940 nm: This peak corresponds to the 3A2g → 3T2g transition, which is a spin-allowed transition involving excitation of an electron from the t2g to the eg set.
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