The basic instrument for IR spectrometry is the infrared (IR) spectrometer.
This device is crucial for determining the types of bonds present in a molecule by analyzing the absorption of specific wavelengths of infrared light by these bonds.
4 Key Points to Understand
1. Principle of Operation
An IR spectrometer operates on the principle that different types of covalent bonds in a molecule absorb specific wavelengths of infrared light.
This absorption occurs because each bond can be likened to a tiny spring, capable of vibrating in various ways.
When infrared light interacts with a sample, the bonds selectively absorb wavelengths that match their vibrational frequencies.
This absorbed light is then converted into vibrational energy within the molecule.
2. Sample Preparation and Analysis
The sample to be analyzed is placed in the path of an infrared light beam.
Depending on the state of the sample (solid, liquid, or gas), different preparation techniques are employed.
For solids, methods like the mull technique or the attenuated total reflection (ATR) method are used.
The mull technique involves mixing the sample with a mulling agent like Nujol to form a paste, which is then applied to salt plates for analysis.
The ATR method, on the other hand, allows direct measurement of powder samples by pressing them against a high-refractive-index prism, such as zinc selenide or germanium, and analyzing the light that is totally internally reflected.
3. Interpretation of Results
By examining the wavelengths of light that are absorbed by the sample, chemists can deduce the types of bonds present in the molecule.
For example, a C=O double bond typically absorbs light at 5800 nm.
The pattern of absorption across different wavelengths provides a spectral fingerprint of the molecule, aiding in its identification and structural analysis.
4. Applications
IR spectrometry is not only used in chemical analysis but also in environmental monitoring.
For instance, it can measure the levels of carbon dioxide in the atmosphere using infrared gas analyzers.
These devices measure the absorption of specific wavelengths by gases like CO, CO2, and CH4, providing valuable data for environmental studies and industrial processes.
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