Dear Osamah Ali Al-Hashimi ,

there are a lot of tables available relating the type of bonds to the wavenumbers;

e.g.:

https://chem.libretexts.org/Ancillary_Materials/Reference/Reference_Tables/Spectroscopic_Parameters/Infrared_Spectroscopy_Absorption_Table

https://www.sigmaaldrich.com/DE/de/technical-documents/technical-article/analytical-chemistry/photometry-and-reflectometry/ir-spectrum-table

file:///C:/Users/W1064/AppData/Local/Temp/IR-Tabela.pdf

You may also have a look at:

https://www.researchgate.net/post/Does-anyone-know-a-good-and-free-online-database-of-IR-spectra

Best regards

G.M.

Dear Gerhard Martens, Thank you very much for your support, but most of these tables talk about C-H, C-O, O-H bonds ... what about other bonds such as Si-O-Si or Si-O?

Dear Osamah Ali Al-Hashimi ,

in addition you may try the NIST data base:

https://webbook.nist.gov/chemistry/name-ser/

Put in the chemical formula (line 1.) and press the 'search button' (line 4.).

Then please click onthe 'vibrational and/or electronic energy levels' button...

The data you are looking for may be listed there.

Good luck

G.M.

Thank you Gerhard Martens I face difficulty because this is the first time I use the FTIR. Kindly, is it up to me that I select the type of a bond if it is lay in the group of C-H. C-O, O-h ... etc or in the group of SI-O-SI or SI-O ... etc?

IR tables and literatures are helpful to identify possible bond type. However, there are so many possible groups for a particular frequency. Even for exactly the same bond, due to the perturbation by the surrounding structures, the frequency has variations and it is not possible to exactly identify the group. Thus, it is advisable to combine the FITR information with other, unrelated or complimentary techniques. For example, if you had a peak near 1100 cm-1, it could be the Si-O-Si stretching mode or aliphatic C-O bond stretching mode or others. However, if you perform elemental analysis, or EDAX (X-ray energy dispersive analysis) with SEM, you can see if you have Si atoms or C only. This way, you can narrow down the possibility. Laser Raman spectroscopy is another technique that offer complimentary information. Synthetic chemists' favorite approach is to combine IR results with 1H and 13C NMR results. This is the reason why respectful chemical journals require three results for a newly synthesized compound, NMR, FTIR, and elemental analysis (or high resolution Mass spectrum). This is the same idea of identifying the 3D epicenter of an earthquake using three seismometers. Another approach, though a bit costly, is to obtain FTIR spectra data base and use the computer to select possible compounds using multiple peaks. Although, if you use one band, you have many possibility of overlapped information, using multiple bands will minimize the misidentification of compounds. Again, this is not a magic and will not identify the exact compound, but only to significantly narrow down the possibility.

Thank you very much Hatsuo Ishida , I have to do the SEM/EDS, XRD and Ramon.

Thank you again and best regards