8.2.6 Mono-deuterium diethyl amine cation radical [a027]

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8.2.6 Mono-deuterium diethyl amine cation radical [a027]

The substitution of hydrogen by deuterium in the amine group (NH) of the cation radical [a026] will produce the following effects: a) an increase in the number of theoretical lines from $5\cdot 3 \cdot 2 = 30$ to $5\cdot 3 \cdot 3 = 45$ ; b) a decrease in the hyperfine splitting $a_D = a_H \cdot 0.1535$ mT and c) a reduction in the length of the spectrum.

With these considerations, interpret the spectrum (Fig. 33); load the EPR simulator and measure the hyperfine splittings of each nucleus. Compare its length with that of the undeuterated radical.

$\begin{figure}\centerline{\psfig{figure=a027.ps,width=3.0cm}} \end{figure}$

**Figure 33:** EPR spectrum of the mono-deuterium diethyl amine cation radical.
$\begin{figure}\centerline{\psfig{figure=a027esp.ps,width=16.0cm}} \end{figure}$

Simulator

[Exercise]

Print the spectrum of Fig. 33 by pressing the following link

Form-a027
Reconstruct the spectrum in the graph paper of the form-a027 by successive splittings.
Indicate the relative theoretical intensities of each multiplet.
Number the lines of the spectrum; mark which ones add intensities; and indicate the relative theoretical intensity.
Pay attention to the scale and do the transformation from cm to mT.
Measure and assign the three hyperfine splittings; measure also the length of the spectrum.
Complete the Table of hyperfine splittings (tab-a026) of the previous section 8.2.5.

Next: 8.2.7 1,4-dihydro pyrazine cation Up: 8.2 Radicals containing r Previous: 8.2.5 Diethyl amine cation Contents

Universidad Autónoma de Madrid, Departamento de Química Física Aplicada