Stretching frequency will be increased for bonds with higher bond strengths. Higher atomic mass atoms in the bond will result in lower stretching frequency values in the IR spectrum.
A popular absorption technique in both qualitative and quantitative assessments is infrared (IR) spectroscopy. Electromagnetic radiation that can change the vibrational and rotational states of covalent bonds in organic molecules is found in the infrared portion of the spectrum.
By exposing a sample to infrared radiation at a variety of frequencies and detecting the absorptions caused by each type of bond in the complex, an infrared spectrometer analyzes a substance. This generates a spectrum, which is typically a "plot" of transmittance percentage versus wavenumber.
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