The peak of KBr in an IR spectrum is not explicitly mentioned in the provided references. However, KBr is commonly used as a matrix for preparing samples for infrared spectroscopy due to its transparency to IR radiation. When preparing a KBr pellet, the sample is mixed with KBr and compressed into a transparent disk for analysis. The specific absorption peaks observed in the IR spectrum would be those of the sample compound, not KBr itself, as KBr is used to facilitate the transmission of IR radiation through the sample.
In the context of IR spectroscopy, KBr is primarily used as a diluent and matrix to support the sample, ensuring that the sample is transparent to IR radiation and allows for the measurement of the sample's absorption peaks. The preparation of the KBr pellet is critical to obtaining a clear and interpretable IR spectrum, as issues such as insufficient grinding of the KBr mixture, moisture absorption by KBr, or improper sample-to-KBr ratio can lead to a cloudy or ineffective pellet.
The references emphasize the importance of proper sample preparation, including the use of KBr, to achieve sharp peaks with good intensity and resolution in the IR spectrum. The intensity of the largest peak in the spectrum should ideally be between 2–5 percent T to ensure accurate detection and interpretation of the sample's spectral features.
In summary, while the references do not provide the specific peak of KBr in an IR spectrum, they highlight the role of KBr in facilitating the measurement of a sample's IR spectrum and the importance of careful preparation to avoid issues that could compromise the quality of the spectrum.
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