The absorption frequency, wavelength and wave number of the fundamental absorption of the NO bond should be determined and the explanation of the comparison of the calculated value with the experimental value found for NO and NO dimers should be determined. Concept introduction: An absorption band consists of an energy range for the various wavelengths in an electromagnetic spectrum. The wave number may be defined as the wavelength per unit distance. The units of wave number are cm − 1 .

Question

Predict the shape of the nitronium ion, NO2+, from its Lewis structure and the VSEPR model. It has one Raman active vibrational mode at 1400 cm−1, two strong IR active modes at 2360 and 540 cm−1, and one weak IR mode at 3735 cm−1. Are these data consistent with the predicted shape of the molecule? Assign the vibrational wavenumbers to the modes from which they arise.

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Question

Chapter 16, Problem 16.4QAP

Interpretation Introduction

Interpretation:

The absorption frequency, wavelength and wave number of the fundamental absorption of the NO bond should be determined and the explanation of the comparison of the calculated value with the experimental value found for NO and NO dimers should be determined.

Concept introduction:

An absorption band consists of an energy range for the various wavelengths in an electromagnetic spectrum.

The wave number may be defined as the wavelength per unit distance. The units of wave number are cm−1.

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Predict the shape of the nitronium ion, NO2+, from its Lewis structure and the VSEPR model. It has one Raman active vibrational mode at 1400 cm−1, two strong IR active modes at 2360 and 540 cm−1, and one weak IR mode at 3735 cm−1. Are these data consistent with the predicted shape of the molecule? Assign the vibrational wavenumbers to the modes from which they arise.

It might be unexpected that the Karplus equation, which was first derived for 3JHH coupling constants, should also apply to three-bond coupling between the nuclei of metallic elements such as tin. T.N. Mitchell and B. Kowall (Magn. Reson. Chem. 33, 325 (1995)) have studied the relation between 3JHH and 3JSnSn in compounds of the type Me3SnCH2CHRSnMe3 and find that 3JSnSn = 78.86 Hz and 3JHH =27.84 Hz. (a) Does this result support a Karplus type equation for tin nuclei? Explain your reasoning. (b) Obtain the Karplus equation for 3JSnSn and plot it as a function of the dihedral angle. (c) Draw the preferred conformation.

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