Chapter 19, Problem 49E

Interpretation Introduction

Interpretation: The reason of different color of ${\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}{\text{]Cl}}_{\text{3}}$ and ${{\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}\text{]}}^{\text{3+}}$ and the color light that is absorbed by ${{\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}\text{]}}^{\text{3+}}$ with the longer or shorter wavelength for both ${{\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}\text{]}}^{\text{3+}}$ and ${{\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}\text{]}}^{\text{2+}}$ needs to be explained. Spectrochemical series with its use in the study of light absorbed by various ions needs to be defined.

Concept Introduction:

Crystal field theory is the theory given to explain the bonding in the coordination complexes. As ligand approaches towards the metal ion, the d-orbital of metal ion divide according to the energy of metal ion. On the basis of energy and degeneracy, the d-orbital can be classified as ${\text{t}}_{\text{2g}}$ and ${\text{e}}_{\text{g}}$ orbitals. The electrons will fill according to their energy levels.