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  • Selectivity of gas-phase ion/molecule reaction of carbon dioxide with phenide ions.

Selectivity of gas-phase ion/molecule reaction of carbon dioxide with phenide ions.

Journal of mass spectrometry : JMS (2014-07-22)
Chongming Liu, Yong Zhang, Athula B Attygalle
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.

MATERIALS
Product Number
Brand
Product Description

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