Question

In IR spectroscopy, a primary amine will produce two signal(s) above 3300 cm-1, because the amino group ________________________.

Answer 1

A primary amine will produce two signal(s) above 3300 $cm^1$, because the amino group has two possible modes of stretching (symmetric and asymmetric)

What is IR?

Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).

The N-H stretches of amines are in the region 3300$cm^1$.

These bands are weaker and sharper than those of the alcohol O-H stretches which appear in the same region.

In primary amines ($RNH_2$), there two bands in this region, the asymmetrical N-H stretch and the symmetrical N-H stretch.

Hence, In IR spectroscopy a primary amine will produce two signal(s) above 3300 cm-1, because the amino group has two possible modes of stretching (symmetric and asymmetric).

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