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Chapter 19: Q 19.25 (page 494)

Why are liquid samples spun while being examined in an NMR spectrometer?

Short Answer

Expert verified

Liquid samples in NMR are spun to overcome the effects of in-homogeneity in magnetic field.

Step by step solution

01

Step : concept

NMR stands for Nuclear Magnetic Resonance. NMR spectroscopy is used in molecular chemistry analysis based on magnetic field.

02

Description

NMR spectroscopy need homogenized magnetic field over the entire sample.
When the magnetic field is homogenized the effect of the external magnetic field, each nucleus of liquid sample feels the same strength from the magnetic filed. This causes liquid samples in NMR to spin along longitudinal axis to overcome the effects of small field in-homogenities.

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Most popular questions from this chapter

A resonance is displaced $90 Hz$ from TMS at a magnetic field strength of 1.41 T. What will be the frequency difference at $(a) 4.69 T, (b) 7.05 T, (c) and 18.8 T$ ? What will be the chemical shifts d at these same magnetic field strengths?

Use the following coupling constant data to predict the ${}^{1}H$ and the ${}^{19}F$ spectra of the following:

$\begin{array}{l} S p e c i e s & J, Hz \\ (a) F - C \equiv C - H & 21 \\ (b) {CF}_{3} - {CH}_{3} & 12.8 \\ (c) {({CH}_{3})}_{3} - CF & 20.4 \end{array}$

From the proton spectrum given in Figure 19-45, determine the structure of this compound, a commonly used pain killer; its empirical formula is $C_{10} H_{13} {NO}_{2}$ .

Explain the difference in the way a CW and an FT-NMR experiment is performed.

Predict the appearance of the high-resolution proton NMR spectrum of

(a) cyclohexane.

(b) diethyl ether.

(c) 1, 2 - dimethoxyethane, CH₃OCH₂CH₂OCH₃.

See all solutions

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