   Chapter 22.7, Problem 22.6CYU

Chapter
Section
Textbook Problem

1. The complex [Co(NH3)5OH]2+ has an absorption maximum at 500 nm. What color of light is absorbed and what color is the complex?2. Figure 22.15 shows a sample of yellow [Co(NH3)5NO2]2+. What color of light is absorbed by this complex? Predict whether this is a high-spin or low-spin complex.

(a)

Interpretation Introduction

Interpretation: The color of light absorbed and the color of the complex in [Co(NH3)5OH]2+, has to be identified.

Concept introduction:

Colour or Visible region: The electromagnetic radiation in range of 400700nm 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.

E==hcλwhere, ν=frequencyλ=wavelength

Explanation

[Co(NH3)5OH]2+ absorbs 500nm, so the absorbed color corresponds to green. The absorbed colours and exhibited colours are complimentary to each other

(b)

Interpretation Introduction

Interpretation: The color of light absorbed and spin configuration (high or low) of complex [Co(NH3)5NO2]2+ has to be predicted.

Concept introduction:

Colour or Visible region: The electromagnetic radiation in range of 400700nm 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.

E==hcλwhere, ν=frequencyλ=wavelength

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