All Questions
Tagged with intermolecular-forces molecular-structure
14 questions
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Does glucose form a molecular lattice in the solid state?
When I look at solid iodine, it is a molecular lattice held by van der Waals forces. Glucose is also simple molecular and so I naturally assumed that because it is solid like iodine, it forms ...
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2
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Cucurbiturils and cyclodextrins — what is the difference?
One was reading about the cyclodextrins on this site and decided to further investigation on the matter. One encountered a class of molecules called cucurbiturils, which are macrocyclic molecules that ...
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9
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Are London dispersion forces in xenon tetrafluoride strong enough to make it a solid?
Xenon_tetrafluoride ($\ce{XeF4}$) is a well-known square-planar molecule with no dipole moment. Molecules are thus have to be bound to each other by London dispersion forces (LDF) which are known to ...
-3
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1
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Is there any material that, subjected to electricity, extends in size in multiples without substantial change in heat for human use? [closed]
Is there any material that can molecularly restructure so as to expand its intra- or inter-molecular distance by no less than three-fold without substantially losing its structural integrity and ...
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1
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57
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Analog of chemical accuracy in vibronic energy calculation [closed]
Is there any analog of chemical accuracy in vibronic energy calculation? I understand that the unit is /cm however, probably, I shouldn't expect a given number in that unit as the analog.
I am ...
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0
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Resource estimate for ab initio calculation [closed]
I have recently come across this very intriguing paper “The Fundamental Vibration of Molecular Hydrogen”.
I have asked the authors the following naïve questions directly via email?
What was the ...
- 245
3
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1
answer
102
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What does "the natural bond angle" mean in the context of Universal Force Field (UFF) potential energy calculation and how are bond angles calculated?
As the title says, what does "the natural bond angle θ0" mean in the context of Universal Force Field (UFF) potential energy calculation? The reference appears in section D. Angular ...
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3
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1
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What are the limits of size differences in a host–guest complex?
We learn in my chemistry course that there must be a snug fit for a host-guest complex to form. So, something like benzene (0.6 nm in diameter) can form a host-guest complex with a β-cyclodextrin host ...
user107675
15
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2
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Help understanding how "steric effects" are distinct from "electronic effects"?
@jakebeal's excellent answer to Why do animal cells “mistake” rubidium ions for potassium ions? includes the following passage:
In the case of potassium versus sodium, which are both very important ...
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0
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1
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79
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Forcing atoms closer together [closed]
Is there a method in chemistry to alter the energy of atomic bonds by forcing atoms closer together in a smaller volume?
Similar to how pressure squeezes atoms closer together.
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4
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694
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Why is casein hydrophobic?
According to this source hydrophobic behaviour occurs when a molecule does not have a charge or is neutral and therefore cannot be attracted to the negative nor positive parts of water. Casein has an ...
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2
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Do molecules with polar bond, but with no dipole moment experiences a greater effect from the london dispersion forces?
Do molecules that have polar bonds and a structure that makes the polarity of those bonds cancel each other out, experience a greater effect from the London dispersion force, than molecules with a ...
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2
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2
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458
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Why is polymer B more dense than polymer A?
The official solution is that A has branched / side chains, weak Van der Waals forces between the polymer chains, less compact packing than B, and large inter-chain distances.
B has no branched chains,...
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1
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1
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519
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Difference between Force Field and topology, and other related questions
I am performing some Molecular Dynamics computer simulations and I am learning about the various Force Fields (FF) such as OPLS-AA, OPLS-UA, AMBER, etc.
Many things are still unclear to me. I put ...
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