Questions tagged [optical-properties]
Questions related to color as well as the reflecting and refracting properties of chemicals.
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Why are fats glossy?
I am talking about the standard fats we see in everyday use (triglycerides). It seems that no matter what the composition, saturated or unsaturated, all fats are glossy when liquid. I don't know if ...
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What happens when (+) 2-iodobutane is treated with NaI in acetone?
After treating the compound with NaI, we should follow SN2 mechanism and the product will follow an optical inversion, giving us (-)2-iodobutane, but the answer is (±)2-iodobutane.
After going ...
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How is Volume an Extensive Property? [closed]
Based on the following definitions, can anyone explain why volume is an extensive property?
Extensive Property: Properties that depend on the amount of matter in a sample.
Volume: the amount of ...
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Why are square planar coordination compounds with four different ligands optically inactive?
Why do square planar coordination compounds of type $\ce{[Mabcd]}$ not show optical activity, although they contain 4 different ligands (i.e. chiral central metal atom)?
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Does alumina become transparent at high temperatures?
Consider a normal opaque alumina crucible. I've heard that they become transparent at higher temperatures and therefore, are not appropriate for high precision DSC (caloric) measurements. The reason ...
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Meso and achiral does both term means the same?
When a molecule has plane of symmetry, or centre of symmetry it is termed as an achiral compound (though it contain some chiral centres). Same goes for the meso compounds due to the internal ...
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When an electron returns to it's ground state does it release the same wavelength of light that promoted it in the first place?
If this is true, I fail to understand why we see colour at all -- wouldn't any wavelengths absorbed by electron promotion be inconsequential to colour because there would an equal amount, and ...
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What does it mean if I am unable to write RS configuration for a compound?
We had to write all possible optically active monochloro derivatives of 2-methylbutane.
I was unable to write RS configurations for 1 and 3, since they have carbon atoms with more than one same groups ...
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Intensity of “surface plasmon resonance “ absorption peaks for a nano-rod
The SPR absorption spectrum of a nano-rod is seen to have two peaks with the longer wavelength peak corresponding to the absorption by the longitudinal plasmons and the other to the transverse ...
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Does inversion of configuration necessitate reversed optical rotation?
Say, optically pure 2-bromobutane undergoes $\mathrm{S_N2}$ reaction with an alkali to form 2-butanol. The configuration about chiral carbon will now be inverted, but is it necessary that the sign of ...
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Conditions for Chirality in optical isomerism [duplicate]
Is it necessary that any atoms which is chiral must have 4 different atoms around the central chiral atom(maybe it can be carbon if it's organic molecule) bonded to it?
More specifically:
I mean can't ...
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Effect of direct exposure to sunlight on various drugs
Today, we were discussing optical activity in class and our teacher said that some drugs are kept in dark coloured bottles to avoid direct exposure to sunlight. Same is the case with some other drugs ...
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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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Refractive index of barium sulfate
What is the refractive index of barium respectively where do I find it? I only find values for alpha, beta and x-ray radiation like on https://pubchem.ncbi.nlm.nih.gov/compound/barium_sulfate#section=...
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Quantum dot band gap energy equation
I have been looking into certain approximations for band gap energies in quantum dots and I found a paper [1]. However, I noticed that the equations which they obtain are not useful to the situation ...
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