Shielding and Deshielding - H NMR Spectroscopy

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This organic chemistry video tutorial discusses shielding and deshielding as it relates to H-NMR spectroscopy. A hydrogen nucleus is said to be shielded from an external magnetic field if it is an electron rich environment. It will thus appear upfield in the NMR spectrum. Protons adjacent to electron withdrawing group are said to be deshielded and appear downfield in a NMR spectrum.
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5 окт 2024

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Комментарии : 66

@TheOrganicChemistryTutor 8 месяцев назад

Final Exams and Video Playlists: www.video-tutor.net/

@bloobeff 4 года назад

"b is in the middle bc its just in the middle" , that is my explanation too i felt that

@couragemensah4291 3 года назад

oh im so grateful . You are making me love chemistry the more. The way you take your time to teach is just so amazing. keep up the good work

@drball2558 5 лет назад

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@vangaverejentel 4 года назад

Your tutorials have been such a great help and it's much appreciated because my professor failed to make a decent book

@Saif-jp8ue 4 года назад

You are the best youtuber, Period.

@aryanimagine 5 месяцев назад

A lil maybe me too

@brightonhamusonde5080 Год назад

This is deeply, wonderfully and passionately explained. Thanks so much brother man

@piyush9517 11 дней назад

Thank you for existing ❤️❤️

@joelsunny 4 года назад

Life saver

@leilaborromeo 5 лет назад

your tutorials are the best i've seen here on youtube!!!

@aryanimagine 5 месяцев назад

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@aiyshasulaiman5755 3 года назад

Super super super helpful. Thank you!!

@lingeaswaranss6753 2 года назад

you r the best in explanation

@AK2I47 5 лет назад

great tut

@MaryBukowski 11 месяцев назад

thank you o-chem tutor!

@ahhkg 8 месяцев назад

Amazing teaching

@faisalarafat4985 5 лет назад

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@aryanimagine 5 месяцев назад

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@chessmaster6407 Год назад

excellent explanation

@ganeshgs2241 5 лет назад

more the electron density around the nucleus, we need more energy to penetrate the electron shield and to feel the nucleus which means more frequency. ie.. we need higher frequency to dance the shielded protons.... this video is complete contrary.. Please verify sir...

@thio2620 5 лет назад

Thats why i was wondering that why my text book and this video is not telling me the same.there is something else in my book 😧.I watched this two times .maybe there is some other point we are missing.

@karenarmstrong2796 2 года назад

I understood it as the more electron density around the nucleus the lower the effective field felt by the nucleus the lower the frequency needed to flip the spin (get a signal).

@neil7272 5 лет назад

Calculus 2 Final Review please!

@janpavlik3170 4 года назад

You are an amazing tutor, thank you! :D

@johnguillen68 5 лет назад

Thank you for this explanation. I got a better understanding

@jesusmrosario-claudio4104 4 года назад

Thank you once again.

@koko-oz7jf 4 года назад

Actual god like person

@novelsolomon2871 5 лет назад

H NMR signaling please,, thank you so much!!

@aryanimagine 5 месяцев назад

Avatar!

@haneefamusa4155 10 месяцев назад

THANK YOU SO MUCH

@muskanborana1158 3 года назад

It was very useful thank you sir!!!

@moonlight-lc7zc 4 года назад

Super duper ! Thank you so much

@drball2558 5 лет назад

It has other teacher and you know it. But overall you are in the top ten

@aryanimagine 5 месяцев назад

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@avocadosnumber498 2 года назад

You might be wondering "what does that even mean?" I've been wondering that every day since orgo started lololol

@marvellnelson9141 5 лет назад

Thanks keep up the good work.

@babitachaudary3683 4 года назад

I need your other videos related to this topic

@sabarinathans1438 19 дней назад

very very very good

@ayshafariatwinkle8717 2 года назад

Excellent

@mahxylim7983 2 года назад

Thanks a lot !

@PaKiKiNg908 5 лет назад

Thank you so much Sir

@imranh9055 5 лет назад

Thats a great lecture......

@alkhan5445 3 года назад

Great vid.

@ClarissaRose 3 года назад

Thank you so much!!!!

@taiwomoboluwarin1388 2 года назад

Thank you

@alisharo58 4 года назад

I just don't understand why if the neutron/atom is SHIELDED, why a LOWER FREQUENCY is needed. I guess I'm thinking of frequency in terms of energy. If there's a shield preventing the atom from feeling the magnetic field, wouldn't more energy (proportional to frequency) be needed (to create a prominent effect, B_eff, on the neutron)?

@ramdog2536 4 года назад

The magnetic field isn’t the energy source in NMR, but it determines the energy difference between the two nuclear states (pointing ‘with’ and ‘against’ the magnetic field). You need to fill in this energy difference with the right amount of radio wave energy (the amount of energy rises with the wave’s frequency) to achieve nuclear magnetic resonance. The stronger the magnetic field, the higher this energy difference (with no magnetic field, there is no energy difference because the nucleus is free to ‘point’ wherever it wants). The NMR machine applies only one magnetic field of constant strength, but it uses a whole spectrum of radio wave frequencies to see which frequencies are just right to put the nuclei into magnetic resonance. Watch the video again with these things in mind.