IR Spectroscopy - Basic Introduction

[@TheOrganicChemistryTutor]

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[@DuyNguyen-qv3pi]

I have been stressed out too much lately because of this weird IR. But your video has made me so much belief that I could do this and improve. Thank you.

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[@theriverglass]

Thank you, this video saved my life! I just can't get IR at all and you really cleared it up for me.

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[@veronicaaguiniga8496]

Of course it's always necessary to have a basic introduction to IR spectroscopy, and this video does so at a quick rate and so well. And of course again, I love this channel on youtube because not only do you explain a concept but provide practice problems in order to better understand IR spectroscopy.

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whole concept is stabilized in my mind after watching the video Thank you so much 🙏sir.

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Can't wait to remember these functional groups AND their corresponding wave numbers...

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Love this video very simplified understand able

[@naglaaforaiby4535]

Thanks for the great efforts, could you please explain the IR spectra for concrete (clinker ) and oxides that it contains.

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Thank you so much 🙏 Helps a lot!

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thank you for simplifying this topic

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this took my chem teacher 6 hours to discuss…

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[@ashfilbrun1556]

Can someone please explain to me why the non-conjugated ketone (around 14:50) can't do resonance yet the conjugated ketone can? Thank you.

[@bacchus9389]

If you try to move the double bond that isn’t the ketone on the left molecule, you’ll give some carbons more than four bonds, so you don’t get an additional resonance form (so you’ll get the double bond from the ketone moving but not any additional ones). The right one participates in resonance because the double bond is right next to the ketone, so it can “fill in” the positive charge left by the ketone, so you get an additional resonance form with that double bond being able to be moved over.

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[@starstar7692]

Thanks for your detailed explanation. Yet, may I know why the fingerprint region ranges from zero cm-1 to 1500cm-1 ? thanks a lot

[@robertbrea8671]

You would see the aldehyde FG group just above 3000 cm^-1, around 3100cm^-1 because the carbon bonded to H is sp2 hybridized. Idk about what you said about 2700cm^-1 for aldehydes to be true

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[@subrajars1210]

Thank you very much sir...and I have one confusion...in this video while explaining about conjugation , u said conjugated alkene absord higher energy at lower wavenumber ....but energy and wavenumber are directly related...pls explain this.

[@tasukedate8180]

When he said wave umber, he was referring to the x axis on an IR spec graph. For example, a ketone is found at 1720 cm-1. But if the ketone is conjugated, the number changes to 1680 cm-1. Generally, conjugation lowers the wave number by. 40.

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[@An-hw5tl]

Can you tell me how I can find an atlas book for infrared or others structural spectroscopy

[@dbzbasil2189]

Thanks for that mr M.Q

[@StrsAmbrg]

What is mean wave number? I knew about wave length, but I just knew about wave number. As the unit is /cm, seems like it is wave density.

[@karaborose1940]

A wave number is the reciprocal of the wavelength its 1/wavelength hence its in cm-1

[@StrsAmbrg]

@@karaborose1940 I still don't understand. So, why don't just call wave length, as physic only knows wavelength or frequency?

[@HughCStevenson1]

@@StrsAmbrg Wavenumber is proportional to frequency and energy of the photon. The only reason that the weird cm-1 unit is used is because spectroscopist chemists haven't caught up with the SI unit system! :) No, seriously, it is just a convention. Annoying to me. Using an energy based unit (as contrasted to wavelength) is that energies can be added and subtracted and the maths works out. Because wavelengths are inverse it doesn't.

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I hate that I have to memorize all this.

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i wish you would put out a copy of your notes

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[@justclassicallymodern374]

Hi sir, does the person have to remember the wavelengths of different groups, or do questions or tests provide some vague hint or info to tell you the wavelengths?

[@ishasama9347]

it depends on the questions but in my class i have to have them memorized

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[@drdennymolpv5976]

The figures will be more clear if you use yellow color instead of blue..

[@JeopardyJohnson]

Whay id the conj absorb IR at a lower energy?

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I need interpretation of losartan potassium reference peak range

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[@rassimsimou1594]

Good

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Thankyou

[@hugopurpeq]

isnt the ketone located at 1715 cm^-1 ?

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Thanku sir

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Is done

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second time watching hard to memorize 😭

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