Reason for the given complexes are different colour has to be explained. Concept introduction: The fact that colour depends on the ligand allows us to create a spectrochemical series, which ranks the ability of a ligand to split d-orbital energies. The relative magnitude of Δ for a series of octahedral complexes of a given metal ion. As Δ increases, higher energies (shorter wavelengths) of light must be absorbed to excite electrons. The spectrochemical series is I − < C l − < F − < O H − < H 2 O < S C N − < e n < N O 2 − < C N − < C O Relationships on an artist’s colour wheel in which complementary colors are wedges opposite each other. Figure 1

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Chapter 23, Problem 23.97P

Interpretation Introduction

Interpretation:

Reason for the given complexes are different colour has to be explained.

Concept introduction:

The fact that colour depends on the ligand allows us to create a spectrochemical series, which ranks the ability of a ligand to split d-orbital energies.

The relative magnitude of Δ for a series of octahedral complexes of a given metal ion. As Δ increases, higher energies (shorter wavelengths) of light must be absorbed to excite electrons.

The spectrochemical series is

I−<Cl−<F−<OH−<H2O<SCN−<en<NO2−<CN−<CO

Relationships on an artist’s colour wheel in which complementary colors are wedges opposite each other.

Figure 1

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