All Questions
Tagged with stereochemistry bond
12
questions
5
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Can a double bond extend beyond the plane and if so, how would it be drawn?
Can double and triple bonds, etc., extend beyond the plane in a Lewis structure, and if so, how are they represented? I.e., how would 1 and 2 in this image be drawn if they were doubles or triples?
- 153
8
votes
1
answer
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Does the Location of Line-Dash-Wedge Notations Matter?
In Line-Dash-Wedge notation, when illustrating that an atom or bond is directed towards or away from the viewer (solid triangle for coming forward, dotted lines for going back), does the location of ...
0
votes
1
answer
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Number of F-Br-F angle of 90 degree in BrF5?
I faced a question like this:
The number of $90$ degree $\ce{F-Br-F}$ angle in $\ce{BrF5}$ according to VSEPR theory is:
The answer is given $0$ or $8$. I know $\ce{BrF5}$ has $\pu{sp3d2}$ ...
- 2,331
8
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1
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How to draw wedged double bond in ChemDraw?
How can I draw a wedged double bond in ChemDraw? When I try to draw BINAP, making the wedged double bond seems impossible. It is however possible to draw a bold double bond.
- 107
5
votes
1
answer
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Differences in Gibbs activation energies for rotation around a bond
Question
Why is there a difference in energy in the rotational barrier between these two structures?
My reasoning is such:
Due to conjugation between the O electrons and the pi- double bonds, the ...
- 1,799
7
votes
3
answers
5k
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Is there a definition of rotatable bond?
Some intramolecular bonds are rotatable in the sense that the torsion angle around this bond is flexible (for example, $\psi$ and $\phi$ angles in a protein backbone). Others are essentially fixed (...
- 729
6
votes
2
answers
590
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Explaning Cis & trans isomers through VSEPR
Total rewrite as was a panic-stricken 2am question.
Unfortunately I wrote on an application that VSEPR theory is a reason of Cis-Trans isomerism (specifically in fatty acids however I doubt that ...
- 61
4
votes
1
answer
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Are bond angles constant?
I'd imagine the answer to the question posed in the title is no - bond angles are not constant. Covalent bonds are not infinitely rigid; hence IR as a spectroscopic technique.
If so, how can we ...
- 19k
2
votes
1
answer
802
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Bond Angles and intermolecular interactions
It's fun to consider bond angles of molecules in isolation. For example, what is the number of different bond angles exhibited by the most polar form of $\ce{SIBrClF2}$?
However, can bond angles ...
- 19k
98
votes
2
answers
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What is Bent's rule?
I'm all bent out of shape trying to figure out what Bent's rule means. I have several formulations of it, and the most common formulation is also the hardest to understand.
Atomic s character ...
- 19k
10
votes
2
answers
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Why does nitrous acid exhibit (unexpectedly) different bond angles?
Data Point 1 - quantum chemical calculations
http://nzc.iap.ac.cn/uploadpdf/Wang_et_al._CSB_2007a.pdf
Key points in paper:
There is some sort of interaction between the hydrogen and the terminal ...
- 19k
10
votes
1
answer
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Covalent bond deformation
When do covalent bonds of a molecule $M$ extend or compress while no bonds in $M$ are broken? I can conceive of some possibilities but I don't know how common they are:
Temperature changes
Inter-...
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