Question

An IR spectra can be divided into three major regions for interpretation. Provide a range for these three regions and what functional groups and associated peaks value you would expect to see in each region.

Answer 1

The infrared portion of the electromagnetic spectrum is usually divided into three regions;

1. near-,
2. mid- and
3. far-infrared, named for their relation to the visible spectrum.

The higher-energy near-IR, approximately 14000–4000 cm−1 (0.7–2.5 μm wavelength). This region will provide overtone or harmonic molecular vibrations.

The mid-infrared, approximately 4000–400 cm−1 (2.5–25 μm) be can analyse fundamental vibrations and associated rotational-vibrational structure.

The far-infrared, approximately 400–10 cm−1 (25–1000 μm), lying adjacent to the microwave region, has low energy and may be used for rotational spectroscopy. The names and classifications of these subregions are conventions and are only loosely based on the relative molecular or electromagnetic properties.

Infrared Spectroscopy is the analysis of infrared light interacting with a molecule. Infrared Spectroscopy can be analyzed in three ways by measuring absorption, emission, and reflection. The organic and inorganic chemistry can be analyzed by Infrared Spectroscopy It is used by chemists to determine functional groups in molecules.