Bond Length

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Yeprem
Posts: 82
Joined: Wed Sep 30, 2020 9:40 pm

Bond Length

Postby Yeprem » Sun Nov 15, 2020 8:35 pm

Is there a cutoff value for considering a bond overwhelmingly single-bonded or ample double-bonded?

JoshMoore2B
Posts: 85
Joined: Wed Sep 30, 2020 9:51 pm

Re: Bond Length

Postby JoshMoore2B » Sun Nov 15, 2020 8:43 pm

Yeprem wrote:Is there a cutoff value for considering a bond overwhelmingly single-bonded or ample double-bonded?


I believe that this is a pretty discretionary thing, so it is up to the individual. Generally, I would say something is overwhelmingly single- or double-bonded if the measured values for the bond lengths are very close (i.e. the bond length is usually 120 pm, and in the molecule it is observed to be 121), while ample is tending towards that length (i.e. 127-130). Overwhelmingly seems to be a very strong word, and so I would think it would need very strong evidence to support it.

Samudrala_Vaishnavi 3A
Posts: 93
Joined: Wed Sep 30, 2020 9:34 pm

Re: Bond Length

Postby Samudrala_Vaishnavi 3A » Mon Nov 16, 2020 8:54 am

I've noticed that for bond length reference points it tends to vary based on the example you are looking at in terms of homework questions. There will usually be a table given to you of the experimental bond lengths compared to the actual bond lengths of the Lewis structure you are looking at. In this way, you can gauge the accuracy of the wavefunctions for hybrid Lewis structures thinking application-wise. There is not really a set cut off from what I know.

Brian_Wu_3B
Posts: 93
Joined: Wed Sep 30, 2020 9:41 pm

Re: Bond Length

Postby Brian_Wu_3B » Mon Nov 16, 2020 9:19 am

Usually I just choose whichever one the actual bond length is closer to. Although I'm not sure if that's correct. What do you guys do?

Anna Yakura 2F
Posts: 123
Joined: Wed Sep 30, 2020 9:46 pm

Re: Bond Length

Postby Anna Yakura 2F » Mon Nov 16, 2020 9:54 am

I just choose the bond type that the number is closest to, but in the case of an exam I would think the professor would give us a straightforward number.

Charlotte Adams 1A
Posts: 164
Joined: Wed Sep 30, 2020 9:46 pm
Been upvoted: 1 time

Re: Bond Length

Postby Charlotte Adams 1A » Mon Nov 16, 2020 9:56 am

When doing the Sapling, if the length of the bond was closer to that of double bonds, the answer was that it had more double bonds.


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