C-13 nmr spectrum of benzene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of benzene doc brown's advanced organic chemistry revision notes

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Advanced Organic Chemistry: Carbon-13 NMR spectrum of Benzene

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Carbon-13 13C C13 NMR spectrum of benzene

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing C-13 NMR spectra

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C-13 NMR spectroscopy - spectra index

C-13 nmr spectrum of benzene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of benzene doc brown's advanced organic chemistry revision notes

TMS is the acronym for tetramethylsilane, formula Si(CH₃)₄, whose ¹³C atoms are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in ¹³C NMR spectroscopy and all other ¹³C shifts, called chemical shifts, depend on the individual (electronic) chemical environment of the ¹³C atoms in an organic molecule - benzene here.

aromatic benzene C₆H₆, skeletal formula , structural/displayed formula

Interpreting the C-13 NMR spectrum of benzene C₆H₆

As you can see from the diagram above there is only one chemical shift line in the C-13 NMR spectrum of benzene (at 128 ppm) indicating only one chemical environment of all carbon atoms.

This C-13 NMR spectrum of benzene fits in with modern view of it being a completely symmetrical planar hexagonal molecule with all the carbon atoms in the same chemical environment - all bound by the same symmetrical delocalised electron system of the pi orbitals (diagram below)

explaining the 13C carbon-13 NMR spectrum of benzene diagram of the rings of pi orbitals of benzene aromatic compounds aromaticity above and below a hexagonal ring of carbon atoms .

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Associated links

The infrared spectrum of Benzene

The mass spectrum of Benzene

The H-1 NMR spectrum of Benzene

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