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12:04 AM
3
Q: What's the exact mechanism of spin coupling in NMR?

Amr AhmedThe most common one that's found nearly in every textbook and site is that splitting occurs due to the alignment of neighboring proton either with or against the external magnetic field so as it's B effective is increased or decreased, However in Pavia's "Introduction To Spectroscopy" a different...

 
 
13 hours later…
1:17 PM
3
Q: What does the 'S' stand for in base-centered cubic crystals and Bravais lattices?

Kurt HikesThe 'I' used for body-centered systems is for the German word Innenzentriert and the 'F' for face-centered is for Flächenzentriert, also German but what about the 'S' for a, b, or c base-centered crystals?

 
2:09 PM
1
Q: Why is a C4 ring impossible?

Jakob LovernI am admittedly not a chemist. I was playing with a molecule set recently and I created a ring molecule where I double-bonded four carbon molecules to each other in a ring. I was in my university's chemistry department, and a passing biochemist said that such a molecule was impossible, but they ...

 
 
7 hours later…
9:31 PM
0
Q: The extinction coefficients of oxymyoglobin and ferryl myoglobin

ChemistryGeekI want to know what the extinction coefficients of oxymyoglobin and ferryl myoglobin are. I was able to find the one for the oxymyoglobin in this pretty old article (it says that it equals $121 \text{mM}^{-1}\text{cm}^{-1}$), but I couldn't locate any other reference supporting this claim. Furthe...

 

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