Chapter 18, Problem 18.9QAP

Interpretation Introduction

(a)

Interpretation:

The requirements for vibrational mode in a molecule to show IR absorption, Raman active, reason for difference between IR spectrometry and Raman active, circumstances under which vibration mode be both Raman and IR active, circumstances under which the vibration mode be Raman active but not IR active and vice versa is to be stated.

Concept introduction:

The IR spectrometry or infrared spectrometry is the study of infrared light which is interacting with the molecule. The ways to analyze the infrared light are by the measuring the absorption, by measuring the emission and by measuring the reflection.

The Raman spectrometry is the study of molecular vibration which is due to the change in the polarizability of the molecule. The molecule is said to be Raman active, if vibration of the molecule causes the permanent change of dipole moment.

Interpretation Introduction

(b)

Interpretation:

The vibration modes of chloroacetonitrile $\left({\text{ClCH}}_{\text{2}}\text{CN}\right)$ and the reason of fewer Raman band is to be stated.

Concept introduction:

The mode of vibration is of either IR active or Raman active. The asymmetric, symmetric, wagging, twisting, scissoring and rocking are the types of normal modes of vibration of the molecule.

The number of vibration mode for the linear molecule is given by $3N-5$ whereas for the nonlinear molecule is given by $3N-6$. Here, $N$ represents the number of atoms in the molecule.

Interpretation Introduction

(c)

Interpretation:

The conclusion of the $\text{C}-\text{N}$ stretching mode of chloroacetonitrile $\left({\text{ClCH}}_{\text{2}}\text{CN}\right)$ by comparing the spectra in the $2200{\text{cm}}^{-\text{1}}$ region.

Concept introduction:

The IR spectrometry or infrared spectrometry is the study of infrared light which is interacting with the molecule. The ways to analyze the infrared light are by the measuring the absorption, by measuring the emission and by measuring the reflection.

The Raman spectrometry is the study of molecular vibration which is due to the change in the polarizability of the molecule. The molecule is said to be Raman active, if vibration of the molecule causes the permanent change of dipole moment.

Interpretation Introduction

(d)

Interpretation:

The comparison of the contrast of IR and Raman spectrometry with respect to optics, cell materials, sample handling, solvent compatibility and applicability of the various sample types.

Concept introduction:

The IR spectrometry or infrared spectrometry is the study of infrared light which is interacting with the molecule. The ways to analyze the infrared light are by the measuring the absorption, by measuring the emission and by measuring the reflection.

The Raman spectrometry is the study of molecular vibration which is due to the change in the polarizability of the molecule. The molecule is said to be Raman active, if vibration of the molecule causes the permanent change of dipole moment.

Interpretation Introduction

(e)

Interpretation:

The comparison and contrast of the sources and transducer used in Raman spectrometry and FTIR instruments.

Concept introduction:

The FTIR spectrometry is the type of IR spectrometry which uses the heated inert solid. The IR spectrometry or infrared spectrometry is the study of infrared light which is interacting with the molecule. The ways to analyze the infrared light are by the measuring the absorption, by measuring the emission and by measuring the reflection.

The Raman spectrometry is the study of molecular vibration which is due to the change in the polarizability of the molecule. The molecule is said to be Raman active, if vibration of the molecule causes the permanent change of dipole moment.

Interpretation Introduction

(f)

Interpretation:

The comparison of the contrast IR and Raman spectrometry with respect to qualitative, usefulness, detection limits, quantitative analysis and instrument complexity.

Concept introduction:

The IR spectrometry or infrared spectrometry is the study of infrared light which is interacting with the molecule. The ways to analyze the infrared light are by the measuring the absorption, by measuring the emission and by measuring the reflection.

The Raman spectrometry is the study of molecular vibration which is due to the change in the polarizability of the molecule. The molecule is said to be Raman active, if vibration of the molecule causes the permanent change of dipole moment.