Silica (SiO2) has different absorption bands (stretching, bending, symmetric and asymmetric vibrations) in FT-IR spectrum, what are the values of wavenumber (cm^-1) for these absorption bands?
asymmetric vibration of Si–O (1090 cm–1), asymmetric vibration of Si–OH (950 cm–1), and symmetric vibration of Si–O (795 cm–1).
The absorption bands between 800 and 1260 cm–1 have
been described as a superimposition of various SiO2 peaks,
Si–OH bonding and peaks due to residual organic groups.
Water shows an intense characteristic absorption band between 3300 cm–1 and 3500 cm–1
Please find the attached file
There is also a strong band around 480cm-1, which is attributed to the Si–O–Si bending vibration: Article Consolidated Silica Glass From Nanoparticles
Hello S.s. Metwally , There is also an absorption peak at 696 cm-1 often used for quantitative determination because of non interference with other absorption bands.
If we talk about the crystalline forms of silica, like alpha-quartz, then there are indeed certain other bands.
Hanan Azzam
Thank you for your valuable respond.
You mentioned the absorption bands of different types of silica in details, kindly, illustrate if there is a rule from which we can indicate that the pending vibration appears in lower wavenumber than the stretching one or not.
Thank you.
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