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== [[Orange Book]] Entry ==
{{Final
|acronym=
|def=Ion formed by the removal of one or more electrons from a molecule to form a positive ion or the addition of one or more electrons to a molecule to form a negative ion.
:Note: [[Pseudo-molecular ion]] and [[quasi-molecular ion]] are deprecated; [[molecular ion]] is reserved for the intact ionized molecule with no component added or removed other than electrons.
|rel=[[Protonated molecule]]
|ref={{obgb}}
}}


<!-- Orange Book -->
{{orange|
An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occurring isotopes of the various atoms that make up the molecule, with a correction for the masses of the electrons lost or gain.
An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occurring isotopes of the various atoms that make up the molecule, with a correction for the masses of the electrons lost or gain.
}}
<!-- Gold Book -->
{{gold|
http://www.nicmila.org/Gold/Output/M03988.xhtml
An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occuring isotopes of the various atoms that make up the molecule (with a correction for the masses of the electron(s) lost or gained). For example, the mass of the molecular ion of ethyl bromide C<sub>2</sub>H<sub>5</sub>  <sup>79</sup>Br  will be plus 51.0078246 plus 78.91839 minus the mass of the electron (''m<sub>e</sub>''). This is equal to  107.95751 u - ''m<sub>e</sub>'',  being the unified atomic mass unit based on the standard that the mass of the isotope <sup>12</sup>C <nowiki>=</nowiki> 12u exactly.
'''Source''':
PAC, 1991, 63, 1541 ([[Recommendations for nomenclature and symbolism for mass spectroscopy]] (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1549


== [[Gold Book]] Entry ==
[[Orange Book]], p. 205
}}


[http://www.nicmila.org/Gold/Output/M03988.xhtml molecular ion]


An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occuring isotopes of the various atoms that make up the molecule (with a correction for the masses of the electron(s) lost or gained). For example, the mass of the molecular ion of ethyl bromide C<sub>2</sub>H<sub>5</sub>  <sup>79</sup>Br  will be plus 51.0078246  plus 78.91839 minus the mass of the electron (''m<sub>e</sub>''). This is equal to  107.95751 u - ''m<sub>e</sub>'',  being the unified atomic mass unit based on the standard that the mass of the isotope <sup>12</sup>C  = 12u  exactly.
[[Category:Ions]]
[[Category:Orange Book term]]
{{DEFAULTSORT:Molecular Ion}}
[[Category:Gold Book term]]

Latest revision as of 17:38, 1 September 2015

IUPAC RECOMMENDATIONS 2013
Molecular ion
Ion formed by the removal of one or more electrons from a molecule to form a positive ion or the addition of one or more electrons to a molecule to form a negative ion.
Note: Pseudo-molecular ion and quasi-molecular ion are deprecated; molecular ion is reserved for the intact ionized molecule with no component added or removed other than electrons.
Related Term(s): Protonated molecule
Reference(s):

IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979. Compiled by J. Inczédy, T. Lengyel, A. M. Ure. Blackwell Scientific Publications, Oxford (1997). On-line corrected version: http://www.iupac.org /publications/analytical compendium (2000).

IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins.

From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.

Index of Recommended Terms

 





Orange Book

ORANGE BOOK DEFINITION

IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023)

Molecular ion

An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occurring isotopes of the various atoms that make up the molecule, with a correction for the masses of the electrons lost or gain.

IUPAC 1997 Orange Book Chapter 12
Index of Orange Book Terms


Gold Book

GOLD BOOK DEFINITION

IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).

Molecular ion

http://www.nicmila.org/Gold/Output/M03988.xhtml

An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occuring isotopes of the various atoms that make up the molecule (with a correction for the masses of the electron(s) lost or gained). For example, the mass of the molecular ion of ethyl bromide C2H5 79Br will be plus 51.0078246 plus 78.91839 minus the mass of the electron (me). This is equal to 107.95751 u - me, being the unified atomic mass unit based on the standard that the mass of the isotope 12C = 12u exactly.

Source:

PAC, 1991, 63, 1541 (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1549

Orange Book, p. 205

IUPAC Gold Book
Index of Gold Book Terms