FTIR Spectrum Analysis--Meaning and Application of Each Peak

FTIR Spectrum Overview

Fourier Transform Infrared Spectroscopy (FTIR) is a critical tool for identifying and analyzing the chemical structure of substances. By measuring how materials absorb infrared light, FTIR reveals detailed information about the chemical bonds and functional groups present within a material. Each peak on an FTIR spectrum represents different chemical components within the material.

Peak Interpretation

2.1 Calculation of Hardness H

Peak interpretation in FTIR analysis involves understanding and explaining the various peaks on the spectrum. These peaks represent the sample's absorption of infrared light, with each peak corresponding to a specific chemical bond or functional group absorbing infrared light at a particular wavelength. Understanding these peaks is essential for analyzing the chemical composition of materials. Here's a detailed explanation of how to interpret the peaks in an FTIR spectrum:

1.Peak Position (Wavenumber): The position of each peak (measured in wavenumbers, cm-1) indicates which type of chemical bond or functional group is absorbing the light. Wavenumbers reflect the energy state of chemical bonds, with different types of bonds absorbing infrared light at different wavenumber regions.

2.Peak Shape and Width:

3.Sharp Peaks: Typically indicate a high purity compound, as specific chemical bonds in a pure compound usually absorb light sharply and distinctly.

4.Broad Peaks: May indicate a complex mixture or a compound with multiple overlapping absorptions, causing the peak to widen.

5.Peak Intensity:

6.Strong Peaks: Suggest a high concentration of the corresponding chemical bond or functional group.

7.Weak Peaks: Indicate a lower concentration of the chemical bond or functional group.

8.Peak Quantity: The number of peaks reflects the sample's complexity. Multiple peaks often suggest the presence of various chemical bonds or functional groups.

By interpreting these peaks, scientists and researchers can analyze the specific chemical structure of materials, understanding their properties and potential uses. FTIR analysis is widely used in pharmaceutical analysis, plastic manufacturing, chemical research, and environmental science.

Significance of Common Peaks

In FTIR analysis, common peaks represent the characteristics of specific chemical bonds or functional groups within the sample. The position, shape, and intensity of these peaks provide crucial information about the chemical structure of the sample. Below are details of some common chemical bonds and functional groups, along with their representative peaks and significance: