IR Infrared Spectroscopy | Spectrum Interpretation
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- čas přidán 29. 01. 2019
- IR (Infrared) Spectroscopy is used for determining the presence or absence of a wide variety of functional groups in a molecule. One way to begin analysing an IR spectrum is to start at the high wavenumber end of the spectrum (typically 4000 cm-1) and look for the presence and absence of characteristic absorptions as you move toward lower wavenumber.
There are two regions of IR spectrum, one is called functional group region (range : 4000 - 1600 cm-1), another is finger print region (1600 - 400 cm-1)…In functional group region we can find individual peak at specific wavenumber, and can match this data with reference list (find on google )
The absorption wavenumber for a stretching vibration is related to both the force constant between the two atoms (k) and the mass of the two atoms (m1 and m2) by the Hooke's Law equation:

From this relationship, two important trends in the wavenumber for stretching vibrations can be deduced.
1. As the bond strength increases, the wavenumber increases.
2. As the mass of one of the two atoms in the bond increases, the wavenumber decreases.
* Wavenumber also depends on conjugation : More conjugation = less wavenumber
Intensity of Absorption
The intensity of an absorption in the IR spectrum is related to the change in dipole that occurs during the vibration. Consequently, vibrations that produce a large change in dipole (e.g. C=O stretch) result in a more intense absorption than those that result in a relatively modest change in dipole (e.g. C=C). Vibrations that do not result in a change in dipole moment (e.g., a symmetrical alkyne C triple bond C stretch) will show little or no absorption for this vibration.
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Can't believe that someone explain this thing Soo clearly sweetly and easily.....one of the best lecture of IR
Truly magical explaination....May Allah give you more and more knowledge and you share it on a huge level. Stay blessed mam.
Absolutely right 😁
Right
Ameen 😇
I wish I have listened to your lectures during my exams .... that would have increased my grade as well as understanding the concept
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Thankz
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Such explanation i havent seen anywhere on youtube, not even nptel teachers explained so well ❤️❤️
Really helpful, can you please upload this reference list that you have added for functional groups. Thanks in advance
Thank you very much
from Bangladesh 🇧🇩
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Thank you again. Take love ❤❤
Mam best,the way of explaining is very easy so everyone can understand it.Thanks for solving this critical theory in easy way and language.
Your knowledge,the information you have given about the topic and your way of teaching all are Excellent!
Plz make videos on Atomic absorption/emmision spectroscopy and thermal techniques DSC, TGA, DTA also!
czcams.com/video/TB-Wt3p1UAU/video.html : Atomic Absorption Spectroscopy
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Stay blessed
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ab tk u tube pr etana acha explain kisi ne nhi kiya h
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It's my pleasure
Explain the relative peak position of sp3, sp2 and sp hybridized groups in IR spectra
and justify it with their chemistry (which one more up-field and which one is most downfield
and why).
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hey there, i came across a reading that is 1641
so what functional group should i consider it as?
Well explaimed... Impressive
Very helpful. Thanks for uploading just at the time of my exam. Could you please make videos on Electrophoresis?!!
Its live now at : czcams.com/video/citMv0hvfyc/video.html
@@BaaYocan i have all ppt of your lectures of IR?
Very good explanation
Where to find the reference list or spectrum library? Could you please share some links of references
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is there any recent updates in IR interpretation in this video or not?
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How can we confirm the material with ftir