Chapter 22.6, Problem 1CYU

(a)

Interpretation Introduction

Interpretation: The color of light absorbed and the color of the complex in ${[Co{(N{H}_3)}_{5}OH]}^{2+}$, has to be identified.

Concept introduction:

Colour or Visible region: The electromagnetic radiation in range of $400-700nm$ is regarded as visible region which is actually visible to human eyes.

The absorbed colours and exhibited colours are complimentary to each other. 

d-to-d transition: d orbitals in a metal split into higher and lower energy orbitals by absorbing energies.

The energy increases as the wavelength of the light decreases.

  $\begin{array}{c}\text{E}\text{=}\text{hν}\text{=}\frac{\text{hc}}{\text{λ}}\\ \text{where, ν}=\text{frequency}\\ \text{λ}=\text{wavelength}\end{array}$

(b)

Interpretation Introduction

Interpretation: The color of light absorbed and spin configuration (high or low) of complex ${[Co{(N{H}_3)}_{5}N{O}_2]}^{2+}$ has to be predicted.

Concept introduction:

Colour or Visible region: The electromagnetic radiation in range of $400-700nm$ is regarded as visible region which is actually visible to human eyes.

The absorbed colours and exhibited colours are complimentary to each other. 

d-to-d transition: d orbitals in a metal split into higher and lower energy orbitals by absorbing energies.

The energy increases as the wavelength of the light decreases.

  $\begin{array}{c}\text{E}\text{=}\text{hν}\text{=}\frac{\text{hc}}{\text{λ}}\\ \text{where, ν}=\text{frequency}\\ \text{λ}=\text{wavelength}\end{array}$