Selectivity of gas-phase ion/molecule reaction of carbon dioxide with phenide ions.
J Mass Spectrom
; 49(8): 692-9, 2014 Aug.
Article
em En
| MEDLINE
| ID: mdl-25044896
ABSTRACT
On contrary to the widely accepted conviction that the m/z 93 ion derived from phenol does not react with CO2, we demonstrate that it makes an adduct with CO2 to a small but demonstrable extent. For example, the product-ion mass spectrum recorded for the m/z 98 ion derived from [(2)H6]phenol showed a small peak at m/z 142 when CO2 was used as the collision gas. The formation of an m/z 137 adduct ion from the m/z 93 ion (generated either directly from phenol, or indirectly from salicylic acid by in-source decarboxylation) was demonstrated also by multiple-reaction-monitoring tandem mass spectrometric experiments. According to literature, the m/z 93 ion derived from salicylic acid does not undergo CO2 addition because it is deemed to exist only in the phenoxide form. This reaction has been previously proposed as a method for differentiating phenoxide ion from its isomeric hydroxyphenide ions. We propose that the m/z 93 ion, albeit small, exists also as the phenide form together with the predominant phenoxide ion.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Mass Spectrom
Assunto da revista:
BIOQUIMICA
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Estados Unidos