Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
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Chapter 19, Problem 19.27QAP
Interpretation Introduction

(a)

Interpretation:

The high-resolution proton NMR spectrum of acetone is to be stated.

Concept introduction:

The nuclear magnetic resonance (NMR) instrument analyzes the material’s molecular structure by placing the material in the strong magnetic field and measuring the spins.

The NMR spectroscopy measures the following property of the material molecules:

  1. Chemical shift: Appearance of the atomic group composition in the molecule.
  2. The spin-spin coupling constant: It provides information about the appearance of the adjacent atoms.
  3. Relaxation time: It provides information about molecular dynamics.
  4. Signal intensity: It provides the quantitative information about the atomic ratios within a molecule which determines the molecular structure, and proportions of different compounds in a mixture.

Interpretation Introduction

(b)

Interpretation:

The high-resolution proton NMR spectrum of acetaldehyde is to be stated.

Concept introduction:

The nuclear magnetic resonance (NMR) instrument analyzes the material’s molecular structure by placing the material in the strong magnetic field and measuring the spins.

The NMR spectroscopy measures the following property of the material molecules.

  1. Chemical shift:

    Appearance of the atomic group composition in the molecule.

  2. The spin-spin coupling constant:

    It provides information about the appearance of the adjacent atoms.

  3. Relaxation time:

    It provides information about molecular dynamics.

  4. Signal intensity:

    It provides the quantitative information about the atomic ratios within a molecule which determine the molecular structure, and proportions of different compounds in a mixture.

Interpretation Introduction

(c)

Interpretation:

The high-resolution proton NMR spectrum of methyl ethyl ketone is to be stated.

Concept introduction:

The nuclear magnetic resonance (NMR) instrument analyzes the material’s molecular structure by placing the material in the strong magnetic field and measuring the spins.

The NMR spectroscopy measures the following property of the material molecules.

  1. Chemical shift:

    Appearance of the atomic group composition in the molecule.

  2. The spin-spin coupling constant:

    It provides information about the appearance of the adjacent atoms.

  3. Relaxation time:

    It provides information about molecular dynamics.

  4. Signal intensity:

    It provides the quantitative information about the atomic ratios within a molecule which determine the molecular structure, and proportions of different compounds in a mixture.

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Students have asked these similar questions
(a) What would be the chemical shift of a peak that is observed at 655.2 Hz from the reference tetramethylsilane (TMS) recorded using a 90 MHz spectrometer ? (b) At what frequency would the chemical shift of chloroform (CHCl3, δ = 7.28 ppm) occur relative to TMS on a spectrum recorded on a 300 MHz spectrometer? (c) At what frequency and chemical shift would the signal for chloroform occur when using a 1 GHz NMR spectrometer?
The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfield from TMS.(a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downeld from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
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