Recent content by warenzeichen

I wasn't anticipated to use extensive mathematics to explain simple molecules in intermediate organic chemistry courses. I think Huckel's rule is sufficient to explain them. But there are tautomers / one of the resonance structures . Hence, it is important to consider the structure to see if one...

so it is really inside the ring?

but for C=O , is it possible for us to draw as -C-O+ for prediction( although C is less electronegative than O) for molecules with alternative resonance structure, do we need to consider all ?

when we count the no of pi e- , don't we consider the "possible resonance" structure? Also, can we say this is a "fully delocalized" system?

I am not sure how to use Huckel's rule to determine whether this compound is aromatic or not. It seems that inside the ring, there are only 4 pi electrons, and can the e- between C and oxygen move towards the ring?

not sigma*, it's sigma the relative position between sigma and pi bonding MO can vary from Li to N, and O to Ne

so, what can you guess or do when you attend an exam without pc? The major things I would like to know is the "in between", either one must be the correct MO diagram, right?

I would like to know, in the MO diagram of NO should electrons put in the sigma MO first or pi MO first? that means , which one has a lower energy level for the MOs. For O2 , sigma was lower than pi bonding MO because of energy difference between 2s and 2pz, interaction say goodbye...

Thanks for your answer. and finally could you tell me how to calculate it ? It seems that I can not calculate it based on the information I knew in the IR( I don't learn the IR on metal in details... But it looks pretty similar to IR but in more complex way...)

about 40 cm^-1 the V=O stretching vibration for VO(acac)2 at 995cm^-1 and for VO(acac)-piperidine it is at 957cm^-1 I think there should be four bonds except the V=O ? also, one acac is substituted by piperidine, isn't it? Thanks.

I am curious of the reason why the V=O stretching here has a lower frequency than that in VO(acac)2. Is it related to resonance? I am not sure.

Homework Statement 20. The probabilities that a certain type of cell produces during its lifetime 0,1,2 cells of the first generation are 1/4 , 1/2, 1/4, and any cell of the first generation produces cells of the second generation under the same conditions. Find the probabilities...

Thanks a lot! few more questions is it possible for us to predict all the motions(what does it look like, how it "moves") when there are n bending modes? (especially for multiatomic molecules(let's say: n-hexane Can we do that by mathematics?(I think it should be mathematics question?)

That means, bending modes only consist of these 4 motions? and which one does CO2 belongs to(as previous you described) and do you mean that some motions of these four bending motions cannot go on because of symmetry reasons? for CO2, we have 2N-4= 6-4 =2 bending modes why not all 4 kinds of...

bending in xz and yz means? so what will it look like ? Yes, I know. But so far I don't learn Raman spectroscopy...