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3answers
45 views

what is the simple enantiomer in the powder form that one can get?

I want to do some experiments on enantiomers. As it involves more calculations of potential energy surfaces, I would like to do this experiment on a simple enantiomer. For example CHBrClF. But this is ...
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1answer
45 views

Changes in defects in a material due to heat treatment

Currently i am doing some research on optical properties of a oxide material and for that purpose i have done some photoluminescence study on it. Because this is an ongoing research i cant divulge ...
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2answers
515 views

Why are allenes chiral?

How is this molecule chiral? $(Br)HC=C=CH(Cl)$ My thoughts: I know that chiral carbons have different groups attached to it. Here the end carbons have two different groups and a double bond. But, ...
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2answers
168 views

Why only chiral molecules rotate plane polarized light and how does it rotate light?

I have learnt that only chiral or unsymmetrical molecules can rotate plane polarized light. But, why is it so? And how can molecules rotate plane polarized light or what does it actually mean by ...
1
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1answer
271 views

Can we predict Dextrorotatory and levorotatory character of an organic molecule?

Can we predict in which direction a given molecule will bend plane polarized light? If I have a molecule with R form in R-S nomenclature does it mean that the molecule will be dextrorotatory or is ...
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1answer
450 views

Finding chiral carbons in aromatic or cyclic compounds

I know that for a carbon to be chiral four different groups should be attached to that particular carbon. But, what about in the case of cyclic compounds? What's the method to check chirality if the ...
0
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0answers
55 views

Why does the Förster resonance energy transfer exhibit $\frac{1}{r^6}$ scaling?

The title more or less contains my question - why does the Förster resonance energy transfer (FRET) (photon?)-based energy transfer mechanism, which folks sometimes use as a spectroscopic ruler to ...
3
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1answer
396 views

Quantum dot band gap energy equation

I have been looking into certain approximations for band gap energies in quantum dots and have found this paper (Band-structure-corrected local density approximation study of semiconductor quantum ...
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2answers
161 views

Why do shape and size have the greatest effect on the optical properties of nanoparticles?

The LSPR properties of nanoparticles depend on a number of factors, including shape, size, material, crystal structure, dielectric environment, etc. However, it has been consistently shown that shape ...
4
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1answer
425 views

If I have a chiral substrate, should I always assume that both enantiomers are present?

Considering the Sn1 reaction of (S)-2,3-dimethyl-3-pentanol, knowing that this molecule has a chiral carbon, should I always assume that both enantiomers are present, and therefore the products of a ...
5
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2answers
163 views

Is there a liquid crystal or similar material that gets cloudy when an electric field is applied, but is otherwise clear?

Is there a way to make a liquid, such as a liquid crystal material, transition from cloudy or clear and vice-versa using only electric current? By cloudy, I mean, similar to the effect that ...
4
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1answer
432 views

What salts are/are not birefringent?

Is there a quick way to determine if a salt (or ionic compound in general) crystal should be birefringent from its formula without having to know/look up the crystal structure? When I'm looking for ...
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2answers
179 views

Rock that transfers image

This is a question that has been bugging me for over 15 years! In high school while studying elements our teacher showed us a clear white rock or element. It was simply flat on both sides but when ...