IR Spectrum Info: Benzaldehyde, Cinnamaldehyde, etc.

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In summary: Additionally, make sure to check the database of your specific instrument, as different instruments may produce slightly different spectra for the same compound.In summary, the conversation is about obtaining information on the IR spectra peaks and bonds of benzaldehyde, cinnamaldehyde, benzophenone, cyclohexanone, and acetophenone. The person is having trouble finding the information and is asking for help. Suggestions are made to check databases such as Sadtler, NIST, Merck, Aldrich, and SDBS, as well as the instrument's database. It is also mentioned to make sure the spectra were obtained from neat material.
  • #1
OH group student
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i'm having fierce trouble trying to obtain information as to the peaks/bonds in the IR spectra of the following; benzaldehyde, cinnamaldehyde, benzophenone, cyclohexanone and acetophenone.

i keep typing in plenty of the keywords in the various search engines but to no avail.

all i need is a rough guide as to which peaks belong to which bonds!

can anyone provide a decent link to help me out?
thanks
 
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  • #2
Try the sadtler database or the NIST, I think Merck and Aldrich has some good databases for these types of spectra. The thing is, they may have obtained the spectra in a different context, such as different solvents, for which there may be shifts in the wavelength peaks.

If this was for an experiment, you should have obtained each respective compound spectra independently.
 
  • #3
IR spectra are usually observed with neat material if they are liquids or oils, which all of those are. You should certainly check to see that the specta are neat, however.

You should check out the SDBS, they have tons of IR and NMR spectra for common compounds.

http://www.aist.go.jp/RIODB/SDBS/cgi-bin/cre_index.cgi
 
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  • #4
thanks alot, will check em out.
:smile:
 
  • #5
Book

The Aldrich library of FT-IR spectra
 

1. What is IR spectrum analysis?

IR spectrum analysis is a technique used to identify and analyze the chemical bonds present in a substance. It involves exposing the substance to infrared light and measuring the absorption of different wavelengths, which can provide information about the functional groups and molecular structure of the substance.

2. What is the significance of IR spectra for benzaldehyde and cinnamaldehyde?

Benzaldehyde and cinnamaldehyde are both aromatic aldehydes, and their IR spectra can provide valuable information about their molecular structure and functional groups. The peaks in the IR spectrum can indicate the presence of certain bonds, such as C-H bonds in the aromatic ring and C=O bonds in the aldehyde group.

3. How are benzaldehyde and cinnamaldehyde differentiated using IR spectra?

Benzaldehyde and cinnamaldehyde have similar chemical structures, but their IR spectra show distinct differences. For example, the IR spectrum of cinnamaldehyde will have a peak at a higher wavenumber due to the presence of a double bond in the aromatic ring, whereas the IR spectrum of benzaldehyde will not have this peak.

4. Can IR spectra be used to determine the purity of benzaldehyde and cinnamaldehyde?

Yes, IR spectra can be used to determine the purity of benzaldehyde and cinnamaldehyde. If the substances are pure, their IR spectra will have sharp and well-defined peaks. Any impurities present in the sample may result in additional peaks or changes in the intensity of the existing peaks.

5. Are there any limitations to using IR spectra for analyzing benzaldehyde and cinnamaldehyde?

Yes, there are limitations to using IR spectra for analyzing benzaldehyde and cinnamaldehyde. IR spectra can only provide information about the functional groups and molecular structure of a substance, and cannot identify the specific compounds present. Additionally, the interpretation of IR spectra requires expertise and may be affected by factors such as sample preparation and instrument calibration.

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