Diamagnetic anisotropy | Spectroscopy | Organic chemistry | Khan Academy
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- Опубликовано: 9 сен 2024
- Explanation of diamagnetic anisotropy. How it affects chemical shift in proton NMR.Created by Jay.
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Is everything based on the direction you chose for the applied magnetic field? Do the pi electrons flow to produce an opposing magnetic field in the center?
I'm having problems with the volume, even with max volume, I have trouble hearing what you are saying, could you please upload the videos with a higher volume? Thank you very much for the courses, they are very instructive.
can you please tell why the electrons in benzene are moving only in the direction mentioned by you and not in the other direction?
Great explanation otherwise 🙂
did u ever learn why this is…?
@@ciaraogrady7903 look up Lenz's law
Wow now everything makes more sense. Thanks!!!
Thank you so much for this presentation. Very helpful for MRI Registry Exam study!!!
Thank you very much for the excellent video series! @7.37 you say orientation of the molecule matters? also about benzene and all other previous analogies, the current loop we can say we hold it horizontally? but what about benzene? aren't they freely moving in all orientations? does the magnetic field orient them in a certain way? Thank s again
did u ever find out why..?
Wouldn't a lateral orientation of Acetylene to the Bo give a Bin contributing to the Baff. Shifting it further downfield ??
Thank you so much! As always your videos are so reliable.
Been following your videos and learning from them ever since high school and now I'm in my final year of University and will be graduating pretty soon. So basically you've been with me through the journey and have helped me a lot, so I just wanted to express my thanks.
Thank you, Khan Academy, truly. :')
hey there! U have done a really good job in explaining each concept so smoothly ! thanks a ton !
Such a rich video!
How do we know which direction the elcetrons will circulate ?? In ethyne you showed in 7:42 that pi electrons are circulating in anti clockwise direction.. what if we invert the molecule ? It will be the same configuration.. Will the electrons move in clockwise direction then ? It will affect the direction of induced magnetic field and ultimately the chemical shift.. Plz explain
the electrons move in such a way that the induced field is opposite the external applied field.
keep in mind this applies ONLY for diamagnetic materials, such as all the molecules above.
for paramagnetic molecules, such a cyclooctatetraene, you have 2 unpaired electrons and that means the induced field from the paramagnetic electrons will be in the same direction as the applied field ( as a side note, cyclooctatetraene isn't planar, but even for molecules such as O2 which are paramagnetic, the same principles applies, the molecules doesn't even need to be circular.
always remember, unpaired spins enlarge the field, paired spins weaken it.
sidewaysfcs0718 Thank you very much for clearing the doubt sir.
@@sidewaysfcs0718 thanks!
@@sidewaysfcs0718 What is the reason behind unpaired spins creating a current that does not oppose an external field? What is even the reason behind inducing a current in a uniform (non changing) magnetic field in the first place?
Thank you very much for this! That helped. but in the case of C2H2, would the effect be the opposite for the proton on the other side?
I have the same question.
DeepinIngo me too
there are 3 factors majorly that affect the chemical shift,this is just one of them.
Current induced local field will be subtracted from the external field in both occasions as it points in the opposite direction along the whole axis of the molecule (where both hydrogens are). Nobody specified however, why that current flows the way it does, in a uniform external magnetic field... This is the bit that is missing.
Can we say that Double bond is shorter but with a sigma and a pi that dawn electrons in a stronger way compared to a single sigma bond. While a triple bond with a sigma and 2 pi, and even shorter, with 3 electrons shared closely enough, the 2 carbon atoms are more satisfied (with 7/8 e around rather than 6/8 in the case of double bond), thus draw electrons less strongly.
Was that the fixed direction of benzene pi electrons at right?at 2:25
Thank you sir
A very good explanation
Discuss the Hydrogen removal effect in annulene
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Hi sir diamagnetic reaction repel function any chemicals
U showed the arrows for the circulating electrons wrong i guess....they are supposed to be clockwise if the Bin is to downwards.Can someone answer this query? Right hand thumb rule is to be followed i guess
Vibhas Wahi For Bin to be in downward direction, current should be clockwise not electrons as per right hand thumb rule and Lenz law
The subtitles say "benzyne" rather than benzene (benzene is an aromatic ring with two hydrogens removed)
directionn electrons turn is wrong
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