Talk:Phosphorus-31 nuclear magnetic resonance
(Redirected from Talk:Phosphorus-31 NMR spectroscopy)
Latest comment: 3 years ago by Seedybee123 in topic ppm direction convention
 | This article is rated C-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
ppm direction convention
editIn 1975, the IUPAC made recommendations for nuclei other than protons[1] that specified the direction of the ppm scale. Due to this, reports pre ~1975 contain data of the opposite sign. E.g. -100 ppm before, and 100 ppm now.
I think it is worth mentioning this change on the Phosphorus-31 NMR page, as it is useful for anyone comparing with old literature.