Infrared (IR) spectroscopy is one of the most important and common spectroscopic techniques used by chemists for structural elucidation and compound identification [79]. IR spectroscopic analysis is used to determine the various chemical functional groups present in the sample.

How does IR spectrometer work?

Infrared (IR) spectroscopy uses infrared radiation to excite the molecules of a compound and generates an infrared spectrum of the energy absorbed by a molecule as a function of the frequency or wavelength of light. IR spectroscopy therefore allows us to identify the various functional groups present in a compound.

What is the principle of IR spectroscopy?

IR spectroscopy detects the absorption of light by a compound, in the IR region of the electromagnetic spectrum. To absorb light a molecule must have a bond within its structure that can exhibit what is referred to as a ‘dipole moment’ which means electrons within a bond are not shared equally.

What are the objectives of IR spectroscopy?

Simply, it is the absorption measurement of different IR frequencies by a sample positioned in the path of an IR beam. The main goal of IR spectroscopic analysis is to determine the chemical functional groups in the sample. Different functional groups absorb characteristic frequencies of IR radiation.

Why is KBr used in IR?

Potassium bromide (KBr, spectroscopic grade) is typically used as the window material because it is transparent in the IR, between 4000–400 cm-1. This paper compares the IR spectra of 7 mm and 13 mm diameter pellets of three pharmaceutical samples, shown in Table 1.

What are the two main applications of IR spectroscopy?

Infrared spectroscopy is widely used in industry as well as in research. It is a simple and reliable technique for measurement, quality control and dynamic measurement. It is also employed in forensic analysis in civil and criminal analysis.

What is difference between FTIR and IR?

The major difference between the IR and FTIR is that IR uses a monochromatic system, whereas the FTIR uses a Michelson interferometer. IR stands for Infrared spectroscopy and FTIR stands for Fourier Transform Infrared spectroscopy. …

How do you prepare an IR sample?

1) Making a sandwich To prepare a liquid sample to IR analysis, firstly place a drop of the liquid on the face of a highly polished salt plate (such as NaCl, AgCl or KBr), then place a second plate on top of the first plate so as to spread the liquid in a thin layer between the plates, and clamps the plates together.

Why KBr is used in IR?

Potassium bromide (KBr, spectroscopic grade) is typically used as the window material because it is transparent in the IR, between 4000–400 cm-1. Alternatively, samples can be contained within a KBr matrix and pressed to form a pellet that is then analysed.

What is the difference between UV and IR?

Infrared and ultraviolet radiation are two types of electromagnetic radiation. The key difference between infrared and ultraviolet radiation is that the wavelength of infrared radiation is longer than that of visible light, whereas the wavelength of ultraviolet radiation is shorter than the wavelength of visible light.

What do you need to know about IR spectroscopy?

Bookmark added to your notes. What is IR Spectroscopy? Infrared spectroscopy or IR spectroscopy is essentially a way to see what is apparently invisible, which in this case refers to atoms and molecules. It is the study of matter in which how infrared light interacts with a molecule is observed.

Which is the short term for infrared spectroscopy?

Infrared Spectroscopy. IR spectroscopy which is short for infrared spectroscopy deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light.

How is IR spectroscopy used in the food industry?

In the food industry, IR spectroscopy can be used to measure the concentration of different compounds in a particular food item. Even devices that detect gas leaks make use of IR spectroscopy. With the IR spectroscopy method, the infrared light frequencies absorbed by a molecule can be accurately detected.

How is infrared spectroscopy used in organic chemistry?

The IR spectroscopy concept can generally be analyzed in three ways: by measuring reflection, emission, and absorption. The major use of infrared spectroscopy is to determine the functional groups of molecules, relevant to both organic and inorganic chemistry What is IR Spectroscopy?