FTIR

Question 1

Fourier Transform Infrared (FTIR) Spectrometer

Answer 1

• FT-IR stands for Fourier Transform Infrared, the preferred method of infrared spectroscopy.
• It can identify unknown materials
• It can determine the quality or consistency of a sample
• In infrared spectroscopy, IR radiation is passed through a sample.
• Some of the infrared radiation is absorbed by the sample, and some of it is passed through (transmitted).

Question 2

Attenuated Total Reflection FTIR (ATR-FTIR)

Answer 2

• direct sample contact technique
• Sample: solid/semi-solid, liquid, thin films
• require little or no sample preparation

Question 3

Diffuse Reflection FTIR (DR-FTIR)

Answer 3

• no contact sample technique
• Sample: solid (dehydration process for moist sample)
• require sample preparation (combined with KBr salt)

Question 4

How FTIR works?

Answer 4

1) Sample is exposed to infrared light

2) The infrared light is absorbed by the sample, which cause molecules to vibrate

3) The detector measures the light that reaches the sensor, which provides raw information on what was absorbed by the sample

Question 5

FTIR Results: Properties of Peaks

Answer 5

1) Intensity (weak, medium, or strong) = the greater the dipole moment, the greater the change in dipole moment, when a bond stretched, thus more intense the absorption
band

2) Shape (broad or sharp) = • Broad: hydrogen bonding (C-H, N-H), polarity
• Sharp: Non-polar bonds

3) Position (cm-1) in the spectrum

Question 6

APPLICATIONS OF IR SPECTROSCOPY

Answer 6

1) Identification of functional groups & structure elucidation of organic compounds.
2) Quantitative analysis of several organic compounds.
3) Study of covalent bonds in molecules.
4) Studying the progress of reactions.
5) Detection of impurities in a compound

Question 7

Infrared spectroscopy

Answer 7

• Spectroscopy is the study of the interaction of electromagnetic radiation (EMR) with analytes/matter at the molecular level

• Non-halal compounds can be easily detected at the molecular level

• IR spectroscopy allows for the detection of functional group

Question 8

Infrared spectroscopy

Answer 8

• Spectroscopy is the study of the interaction of electromagnetic radiation (EMR) with analytes/matter at the molecular level

• Non-halal compounds can be easily detected at the molecular level

• IR spectroscopy allows for the detection of functional group