HOME PAGE * KS3 SCIENCES * GCSE BIOLOGY CHEMISTRY PHYSICS * ADVANCED LEVEL CHEMISTRY

SPECTROSCOPY INDEXES  *  All Advanced Organic Chemistry Notes  *  [SEARCH BOX]

Advanced Organic Chemistry: Carbon-13 NMR spectrum of propane

Interpreting the Carbon-13 NMR spectrum of propane

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 of propane

13C nmr spectrum of propane C3H8 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of alkane C13 13-C nmr 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 resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the 13C atoms in an organic molecule - propane here.

Propane C3H8, alkanes structure and naming (c) doc b , alkanes structure and naming (c) doc b , alkanes structure and naming (c) doc b , alkanes structure and naming (c) doc b

Interpreting the C-13 NMR spectrum of propane

As you can see from the diagram above there are 2 different chemical shift lines in the C-13 NMR spectrum of propane indicating 2 different chemical environments of the 3 carbon atoms of propane.

CH3CH2CH3 

(Note the 2 different colours indicating the 2 different chemical environments of the 3 carbon atoms in propane).

13C chemical shifts (a) to (b) on the C-13 NMR spectrum diagram for propane.

The carbon atoms of the two methyl groups in propane are equivalent to each other i.e. identical chemical environments.

The carbon-13 NMR spectra provides direct evidence of 2 different carbon atom environments for the 3 carbon atoms in the propane molecule, deduced from the presence of 3 different 13C NMR chemical shifts (ppm).


Key words & phrases: C3H8 Interpreting the C-13 NMR spectra of propane, C-13 nmr spectrum of propane, understanding the carbon-13 nmr spectrum of propane, explaining the line pattern in the high resolution C-13 nmr spectra of propane, revising the C-13 nmr spectrum of propane, ppm chemical shifts of the C-13 nmr spectrum of propane, how to construct the diagram of the C-13 nmr spectrum of propane, how to analyse the chemical shifts in the carbon-13 NMR spectrum of propane deducing the chemical environment of all the carbon atoms in propane examining the c13 nmr spectrum of  propane analysing the 13-c nmr spectrum of propane how do you sketch and interpret the C-13 NMR spectrum of propane interpreting interpretation of the C-13 NMR spectrum of propane assignment of chemical shifts in the 13C NMR spectrum of propane type alkane


Links associated with propane

The chemistry of ALKANES revision notes INDEX

C-13 NMR spectroscopy index

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

TOP OF PAGE

 Doc Brown's Chemistry 

*

TOP OF PAGE