Principal ion: Difference between revisions
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The most abundant ion of a group of [[isotopologue ion]]s. For example, <sup>11</sup>B<sup>79</sup>Br<sub>2</sub><sup>81</sup>Br<sup>+.</sup> is the principal ion of BBr<sub>3</sub><sup>+</sup>. | The most abundant ion of a group of [[isotopologue ion]]s. For example, <sup>11</sup>B<sup>79</sup>Br<sub>2</sub><sup>81</sup>Br<sup>+.</sup> is the principal ion of BBr<sub>3</sub><sup>+</sup>. | ||
The term | The term principal ion has also been used to describe ions that have been artificially isotopically enriched in one or more positions such as CH<sub>3</sub> <sup>13</sup>CH<sub>3</sub><sup>+.</sup> or CH<sub>2</sub>D<sub>2</sub><sup>+</sup>, but those are best defined as isotopologue ions. | ||
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Revision as of 21:05, 13 July 2009
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Orange Book entry
Orange Book
| ORANGE BOOK DEFINITION
IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023) |
| Principal ion |
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This is defined as a molecular or fragment ion which is made up of the most abundant isotopes of each of its atomic constituents. In the case of compounds that have been artificially enriched in one or more positions such as CH3 13CH3 or CH2D2 the principal ion may be defined by treating the heavy isotopes as new atomic species. Thus in the two above example the principal ions would be of masses 13 and 18, respectively. |
| IUPAC 1997 Orange Book Chapter 12 |
| Index of Orange Book Terms |
