^13 C NMR spectroscopy is a technique that produces a peak for each unique carbo
ID: 479070 • Letter: #
Question
^13 C NMR spectroscopy is a technique that produces a peak for each unique carbon or set of carbons in a molecule. C_60 (buckminsterfullerene) has only 1 peak because every carbon in the molecule is the same by symmetry. The^13 C NMR of C_70 (the second fullerene discovered) is significantly different. The structure of C_70 is shown below. If you were the researcher who discovered this molecule, how many peaks would you expect to see in the^13C NMR spectrum? Answer the question by labeling the unique carbons in the structure(s) below.Explanation / Answer
1. the spectroscopic analysis of given molecule
All the carbons in the C60 buckminsterfullerene are sp hybrdized. So all of the carbons would appear at the same posiiton as they are all identical.
We would observe a single peak in the 13C NMR for C60.
On the other hand, the C70 buckminsterfullerene has a combination of five membered ring and six membered ring structure. The 13C NMR would thus show, 3 peaks for the C70 13C NMR spectrum. the six membered ring showing 1 peak and the five membered ring would show 2 peaks.
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