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. Author manuscript; available in PMC: 2016 Jun 10.
Published in final edited form as: Chem Commun (Camb). 2016 May 5;52(39):6561–6564. doi: 10.1039/c5cc10025a

Table 3.

13C content for the central atom and the whole molecule

13C enrichment 1H NMR (%) Mass-spectrometry (%)
C/CH4a 1.1 ± 0.4 1.1 ± 0.1
CH4/13C 5.8 ± 0.9 5.0 ± 0.2
13CH4/C 7.6 ± 1.5 1.6 ± 0.1
a

Natural abundance.