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19 views

What home chemical can I use to make droplet lens?

I'm very interested in making homemade droplet lens, I want to know what home element can I use to cook them. Here's a video showing the process, with no further information: ...
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1answer
31 views

Why are square planar coordination compounds with four different ligands optically inactive?

Why square planar co- ordination compounds of type Mabcd do not show optical activity, although they contain 4 different ligands ( i.e. chiral central metal atom)
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1answer
220 views

Dextro,Levo rotatory and D/L Configuration

What does D(-) tartaric acid mean? D is always (+) Glyceraldehyde, therefore it should be +? If I am not wrong, the D indicates (+) Glyceraldehyde and L indicates (-) Glyceraldehyde and the (+) and ...
2
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2answers
63 views

Why do different impurities create different colors in diamonds?

Traces of nitrogen make diamonds yellow while traces of boron make them blue. What accounts for the differences in color for a given element?
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1answer
780 views

What is the color of elemental silver?

From my lab book it says it is black? I don't understand how we know the color of it is black. Can anyone explain?
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1answer
345 views

What are chiral environments?

I keep seeing the term cropping up, but cannot seem to find a definition for it. My understanding is that it is an environment in which, when the isomers interact with the environment, the two ...
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2answers
92 views

Effect of optical activity

I know that optical activity means polarisation of light but what is so special in that that it changes the properties of the substances significantly
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2answers
312 views

What is there in this 3D representation of organic molecules I fail to grasp?

I think there's a basic idea I'm missing about 3 Dimensional representation of molecules. I think it may be about converting to Fischer representation. Consider the following two products of ...
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3answers
72 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 ...
2
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1answer
114 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
1k 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
510 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 ...
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1answer
796 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
1k 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 ...
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1answer
92 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
471 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 ...
6
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2answers
252 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 ...
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1answer
778 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 ...
6
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2answers
186 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 ...
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1answer
578 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
199 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 ...