HOMO and LUMO Molecular Orbitals for Conjugated Systems by Leah4sci
HTML-код
- Опубликовано: 1 окт 2024
- Leah4sci.com/MO... presents: HOMO and LUMO Molecular Orbitals for Conjugated Systems
Need help with Orgo? Download my free guide ’10 Secrets to Acing Organic Chemistry’ HERE: leah4sci.com/or...
Molecular Orbital theory can be one of the most complicated and frustrating topics to study in chemistry, especially when the focus is on the math and physics behind it. This video offers a logical overview of HOMO and LUMO molecular orbitals, especially as it applies to conjugated systems in organic chemistry reactions and mechanisms. You’ll learn how to draw and understand MO diagrams for systems with more than two electrons in molecular orbitals through the use of a simple analogy.
In this video:
[0:37] Description of HOMO and LUMO
[2:36] Electrons in the Highest and Lowest Energy
[5:16] Alignment and Flow of Electrons
[8:25] Understanding HOMO and LUMO Concept
Links & Resources Mentioned In This Video:
Molecular Orbital Theory Leah4sci.com/MO...
Resonance Structures in Organic Chemistry Leah4sci.com/Re...
Diels Alder Reaction and Mechanism Leah4sci.com/Di...
This is part of the Molecular Orbital Theory Mini Series. Catch the entire MO Theory Video Series on my website at leah4sci.com/MO...
Follow along with your semester by using my Orgo Syllabus Companion: leah4sci.com/sy...
For more in-depth review including practice problems and explanations, come join my online membership site the organic chemistry study hall: leah4sci.com/join
For private online tutoring visit my website: leah4sci.com/or...
For questions and comments, find me on social media here:
Facebook: / leah4sci
Twitter: / leah4sci
Instagram: / leah4sci
Pinterest: / leah4sci
This is the same thing my professor was doin in class today, the difference is she just have the gift of explanation, even an unborn child can understand. Thank you my dear love. You are a God given gift.
Thank you! I'm sorry that your professor wasn't able to explain this (I had the same issues in undergrad). But I'm glad my videos can fill that gap for you
This was a mind boggling topic, I never thought I could understand it until you swooped in and saved the day. Thanks Leah for your great help!!
Wow! Glad it was helpful!
Well done
@@Leah4sci well done 👏👏
So crazy im literally doing this right now and the email popped up. LOL its like you heard me.
Perfect timing, love it! Hope it helps you better understand this crazy topic Denise
@@Leah4sci it really did and I think using the little people helps a lot as well. Thank you 🙏🏼
LITERALLY SAME!! My final on Wednesday has HOMO and LUMO on it! Thank you!!
Your videos saved me during my days in undergrad and now I still go back to your videos as I'm studying for my board exams. Thank you so much! You're the best!
Best of luck! Let me know how they turn out!
Thank you Ma'am. Your lecture really helped me with my undergrad studies and cleared my doubts and to teach my students with more confident. Hope you will reach 1 million subscribers soon ❤️❤️.
Love from Bangladesh 🇧🇩
I'm so happy to help!
Absolute great teacher. Science can be fun and explained well besides reading the lines extracted from theories and lessons and this is what she proved. I will go over her videos more in the future and have subscribed to her. I wonder why would someone dislike such a legendary explaination.
Wow, thanks so much for your kind words!
You’re ability to teach this really rigorous course always amazes me till this day. I’m so happy I came across your videos.
Aww thanks for your kind words, and I'm so happy you found my channel, too!
Thank you pretty much Leah for all of your videos. I enjoy your simplistic way of simplifying complicated topics such as organic chemistry. Love from Palestine
You're very welcome!
Thank you so much mam Please make video s on remaining organic name reactions and mechanism
Thanks for the recommendation. I post free videos as I have time and am always looking for suggestions. For more help with this topic in the meantime, contact me through my website: leah4sci.com/contact
Also check out this: leah4sci.com/naming-organic-compounds-iupac-nomenclature/
This explanation is very helpful to me.Actually real world examples really help to understand the mistry of Chemistry.
Glad it was helpful!
Omg Thank you so much for making this video! This concept was so difficult for me to grasp from my lecture, and your video literally made me feel my fog of confusion disappear! I actually got so excited when I was able to understand this :)
That's exactly how I felt when I finally found another way to think about it. So glad it helped you make sense of this craziness :)
hey i’m german and i didn’t understand this topic until i watched your video. there was no german equivalent and i found this video which helped me a lot. thank you very much :)
Glad I could help!
thank you this is god sent :)
Where were you when I was doing this back in 2007?!?!!! 😭😭😭😭 I remember staying up late drawing circles, almost making holes in my notes just to make some sense into this! Hahahaha 🤣
Oh no! I'm sorry you had such a tough time then, but happy to help you out now!
I used to watch your videos in 2016-17, when I was preparing for my med school entrance exam. I never really liked Organic Chemistry, but you made it tolerable lol
I'm now in my third year of med school.
Thank you! :)
Oh wow, thanks so much for commenting and letting me know. If you're interested in sharing more of your journey, please contact me at leah4sci.com/contact
you are an amazing instructor!!! this made so much sense with your analogies 😁thank you!!! ❤️❤️
Aww, thanks so much! Glad it was helpful!
not sure if I understood it completly but it sure was more entertaining and fun to watch than my chemstry readings in uni
love from germany
Glad you liked it!
Love from Pakistan Mam
It is a land of peace and love....❤
And you are awesome📀❤
thanks
I almost laughed at the word peace 😂
@@taniapradhan7480
Choro tania jis baat k baray main hamain mukamal nahi pta q us k baray main aik dosray ko tanay daytay hain.
Yaar you know what pakistan main india ki girls ka jo name popular hai wo tania hai or larkon ka karan..
Stay positive it all matters
I am in my last week of O-chem 1 and have no time to let that "ah-ha" moment happen before the final. This is amazing. TopHat really failed to teach this concept so clearly. THANK YOU
You're very welcome! Glad you found the video helpful.
In case of 1,3 butadiene, (IN GROUND STATE UNDER THERMAL CONDITION) si 2 is HOMO and si 3 is LUMO. (IN EXCITED STATE UNDER PHOTOCHEMICAL CONDITION) si 3 will be HOMO because an electron jumps from si2 to si3. So in this state what will be the LUMO?
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
Thnx for this video, learned a lot
Glad to hear it!
wow, you''re the guru.... i gerrit now
Lol, glad to help
Mam I am so greatful to watch this and finally i have cleared my doubts regarding this topic.but i have one more doubt.I understood electrons location in the HOMO and resonating Structure.butthe electrons location in the LUMO and the highly unstable orbitals,is there any possibility to form radicals.
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
for me I learnt it
electrons greater than 14 electrons the configuration goes sigma 1s^2 sigma *1s^2 sigma 2s^2 sigma * 2s^2 sigma 2pz pi2px=pi2py pi2px*=pi2py*
Thanks for watching :)
thank you for great lecture
You're welcome!
Stay Blessed and Healthy
Teacher📀❤
thank you, same to you
I see all these views and only 50 likes. Y'all need to watch and like
Thanks! hope you liked it as well :)
amazing lecture
i am graduate in inorganic chemistry, it felt a bit hard to understand the theme of such a confusing topic.
respected mam you made it so clear that now it is on fingertips.
Glad this helped
Hi.
I am confused about 1,3,5-hexatriene structure.
Can someone help me out??
At which specific point in this video do you have a question? Could you clarify?
I like the way you illustrate. It's very clear and I can feel the passion. Thank you!
You're so welcome, and I'm glad to know that my passion for the subject comes through!
hi...great video....can u tell me what program you use to write plz ?
Let's keep the comments relevant to the video topic please. Thanks :)
1:47 I don't understand how there are only 4 atomic orbitals.
If there are 4 carbon atoms, there should be at least 3 sigma bonds right (the lines)?
/\/
And if there are 2 double bonds, shouldn't it be 5 bonds total?
//\//
Bonds are orbitals right?
And that's just with carbons, what about the hydrogens 😭😭😭😭
I'm going to have to watch all your videos...
Bonds are created by the overlap of orbitals. If it was not clear, this video is covering conjugated systems of PI electrons. I am disregarding the sigma bonds in these molecules. Instead, I am speaking of the p orbitals that are overlapping to form the pi bonds.
@@Leah4scithank you for responding!!! please tell me if I'm right on this: all these chemistry books show molecules with sigma bonds and the occasional double bond, which effectively shows a few orbitals, but the vast majority of the orbitals aren't illustrated. I think that's what confuses me, that a molecule actually has an entire collection of orbitals superimposed on each other, but all we ever see in the books are the bonding orbitals with electron pairs, but never the antibonding orbitals. There are probably on the average molecule 5 orbitals that aren't shown because it would seem too complicated, but students need to see that...
But I don't a understand a bit of peak, so can u help me out to interpret it
For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
is LUMO nd HOMO same for ethylene in photochemical condition i..e cy 2?
This video covers molecular orbitals for conjugated pi systems, not for ethylene.
Since I don't offer tutoring over social media, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
My worksheet confused me completely when it got to this and I couldn't wait for my professor to actually bring these problems up in class. Thank you for the great explanation!
You are so very welcome and YAY! I'm thrilled to hear that I cleared up the confusion for you!
Thank you .great teacher organic chemistry
You are very welcome
Thanks for your great help Mam and it is easier then I thought Was difficult without knowing the proper concept any proper explanation But after your explanation this is the most funniest and For my exam thank you mam ❤❤❤
Always happy to help! You're so welcome.
@@Leah4sci welcome mam
Better than my prof's explanation in a shorter time. It just didn't make sense til this
Glad to hear it! :)
From where you belong ?
Can you give me online class !!!!
😊😊
email me at leah4sci.com/contact and I'll talk to you more about the Organic Chemistry Study Hall program! I'd love to have you onboard!
I understand first time the Lumo And Homo concept thank you ❤so much
So glad this helped you understand what I (and many students) found to be quite a tricky topic
you are a good teacher but you can't reach the people who really need this in recent situation like lockdown due to COVID-19 so try to teach by showing your face it would be better................. after your wish
Love from INDIA
I'm better able to explain in this way, but some videos do also have me speaking to the camera. It really depends on the type of lesson. Thanks for watching!
But you tell only about ground state for Photochemical or excited state how we find 😢Lumo And Homo
I focused just on the basics required to understand this concept in the context of organic chemistry reactions.
Are their all lactures of Pericyclic reactions
I have a question, tr.In the 2 occupied orbital, how come the higher energy one is highly occupied molecular orbital, in contrast to the lower energy one.Lower energy means they are more stable than the higher energy one.So, It would make the lowest energy one HOMO.The next question is for LUMO in the same way.
HOMO stands for "highest occupied molecular orbital", which means we are looking for the highest energy molecular orbital that is actually occupied with electrons. LUMO stands for "lowest UNoccupied molecular orbital", which is referring to the lowest energy orbital that is NOT occupied with electrons. It's counterintuitive because the LUMO is actually a higher energy orbital than the HOMO. (In other words, unoccupied is higher than occupied.)
Brilliant! thank you. Not being a chemist, I am inspired to understand human behavior based on your theoretical framework and explanation. Many thanks!!
You're very welcome!
Had this type of question on my test and literally helped so much
Yay, so glad it helped!
My notes so I can understand this video:
# of atomic pi orbitals equals the # of pi molecular orbitals.
So if you have six pi electrons (from three pi bonds) that equals six pi molecular orbitals.
This can be represented by a group of friends. Most stable is all of the friends getting along (completely bonding and low energy and happy), least stable is every single friend is not getting along with anyone (completely antibonding and high energy and unhappy).
Nodes represent distance between two friends, increases energy and moves them to more antibonding level.
And... I was just focusing on your great examples for the rest of the video. LUMO and HOMO make so much sense and the resonance example really helped with understanding the relative energies. Thanks. :) Now I feel ready for Diels-Alder stereochemistry and endo/exo stuff and how the pi orbitals overlap.
Awesome idea! And so glad I helped you understand!
Thank you so much! This cleared a lot of confusion in my head ☺
Glad it was helpful!
Your explanation was so cute that I actualy started to like this topic
Thank you! I don't aim for 'cute', but I'll definitely take it! Lol.
hey mam in electron equal or less tha 14 thete is sp mixing what is it
and how do we get to know abt nodal plane...pls answer them
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
@@Leah4sci oh its ok..I got it already
Ma'am had u given any lec on hyperconjugation??
yes
Thank you for the breakdown!!!! In my class, we get so far with the fancy concepts that I needed a refresher on the concept. Much appreciated Leah!
You're very welcome! I'm glad to hear that I helped clear up the concept for you.
legend
Thanks!
thanks i finally got this after watching ur video
Glad to help!
you absolutely ate down w this video my final is literally in 30 minutes, this was literally one of the first concepts we learned in orgo and it hasnt clicked until i watched this video
So glad I helped clear it up! Hope your final turned out well for you!
You are my biggest life saver!!! 🥰🥰🥰
So happy to help!
Woowww... such a great explanation
Glad it was helpful!
Thank you very much ❤
You're welcome 😊
Thank you so much ma'am...❤️
You're so welcome!
Thanks, I'll have a test on the topic soon.
Happy to help you prepare!
I had a question that if a molecule has highest energy then it should be lowest occupied because if we consider two paths one of highest energy and other of lowest energy so for electron to reach an the orbital the lowest energy one would be easier to reach and thus according to this logic the one who has lowest energy should be highest occupied because it has a more simple path to reach for electrons compared to those one who has more energy but the above theory is contradicting it
I'm sorry, but I'm not understanding your question. At which specific point in this video do you have a question?
Regarding the concept of Homo and Lumo I am relating their occupancy with energy level
@@karanbhanushali6756 ur confused see in respect of electrons not energy🤣
@@Ranjanakumari-fj6vo Ok
I'm speechless! This video is truly a masterpiece! thank you so much!
So glad you found it helpful
Wow. I finally understand how it works. Thank you so so much.
You're so very welcome, I'm glad I could help you understand.
This was helpful.
Glad you liked it!
Leah, you are amazing... but I was wondering if you could clarify one thing for me... why are we only using P orbitals? Are S orbitals unable to participate?
Pi bonds are formed, specifically, by the overlap of unhybridized p orbitals. When we focus on the conjugated pi electrons in a system, we're looking at those electrons existing in p orbitals alone.
@@Leah4sci got it... thank you so much!
This might be the best series of videos I've ever watched. Explains everything so well and makes everything easy to understand. THANK YOU!
Wow, you're very welcome and thanks so much for your kind words!
This was so clear and useful! Thanks!
Thank you! So glad you found it helpful
You are AMAZING❤❤❤❤❤thankssss
You're so welcome!
Very informative and helpful. I just understood one of the concepts that I used get scared of. 👍 Thanks. Attagirl. 😊😊
You're so welcome! Glad it was helpful!
Thank u sooo much ma'am .. I find it too hard to learn .. I can't even grasp the core concept of this but after this lec I'm really happy ... I got the concept 💜
that's awesome
thanks! could u make a video on thermochemically and photochemically allowed systems in relation to MO theory?
Sorry Omar, I've never learned that. It's far beyond the scope of what I teach
I was freaking out about my chemistry problem set, thank you so much for making this! You're a life saver❤️❤️❤️
Always glad to help! You're welcome.
Its amazing video mem.. Thank you so much😊
You're so welcome!
This is an incredible explanation. Thank you so much!!
You're very welcome!
Thank you!!!! cleared my doubts for HOMO & LUMO
You're very welcome, so glad I helped clear things up for you!
You are a legend and the best!
Aww thank you!
Fantastic video. Thank you for the clarification.
My pleasure! I'm glad it cleared things up for you
Can you make a video on molecular symmetry?? Please....
Thanks for the recommendation. I post free videos as I have time and am always looking for suggestions. For more help with this topic in the meantime, contact me through my website: leah4sci.com/contact
Mam make more videos plzzzzzzzzzzzz
I have lots more, and many other resources! Check out leah4sci.com/syllabus
i love you. never stop please
Thank you... But how about we just stick to a professional relationship? Lol
Very very clear explanation and well understood the theory. Thank you very much !
You're so welcome!
Thanks madame
You're welcome!
I love you.. thank you ❤❤
You're welcome 😊
Good explanation madam🙏
Thank you 😃
finally understand this concept thank you
So glad!! You're welcome.
Thank you so so much !!!!!
You're very welcome!
U made it absolutely clear ... Great explanation ! Loved it🙏...
So glad it helped you understand!
this is very intresting
Isn't it? Difficult though
So the lowest status 1,3 buta diane that is trans form,home status is cis form?
It's not about cis or trans. It's about the orbitals themselves. HOMO and LUMO are characterized by energy and nodes.
@@Leah4sci Thanks reply ,but in IR/UV,we can see the energy increased from trans to cis form,maybe cis form like a node between at C2 & C3 ? (it is caused by strict factor)
brilliant
thank you!
Thank you Leah😊
You are so welcome!
Thank you Leah 😊
You are so welcome!
Cute explanation
Thank you
THANK YOU ❤️😭
You're so welcome!
Thank you Leah for explaining this so simplistically!
You're so welcome!
Omg you explained this so well
Thanks so much :)
superrrrr helpful
Glad to hear that, happy to help!
This is genius!!
Glad you like it!
Thanks a lot!!
You're welcome!
this is so helpful. Thank you very much Ma'am
Glad it was helpful!
Thank you very much this help me a lot
You're welcome, so glad it helped!