Cluster phase chemistry: Collisions of vibrationally excited cationic dicarboxylic acid clusters with water molecules initiate dissociation of cluster components

Hugh I. Kim, J. L. Beauchamp

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A homologous series of cationic gas-phase clusters of dicarboxylic acids (oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid) generated via electrospray ionization (ESI) are investigated using collisioninduced dissociation (CID). Singly charged cationic clusters with the composition (Na +) 2n+1(dicarboxylate 2-) n, where n = 1-5, are observed as major gas-phase species. Significant abundances of singly charged sodiated hydrogen dicarboxylate clusters with the composition (Na +) 2n(dicarboxylate 2-) n(H +), where n = 1-6, are observed with oxalic acid, malonic acid, and succinic acid. Isolation of the clusters followed by CID results mainly in sequential loss of disodium dicarboxylate moieties for the clusters of succinic acid, glutaric acid, and adipic acid. However, the dimer of sodiated hydrogen succinate, all malonate clusters, and all oxalate clusters, with the exception of the dimer, exhibit complex chemical reactions initiated by the collision of vibrationally excited clusters with water molecules. Generally, water molecules serve as proton donors for reacting dicarboxylate anions in the cluster, initiating dissociation pathways such as the decomposition of the malonate ion to yield an acetate ion and CO 2. The reactivity of several mixed dicarboxylate clusters is also reported. For example, malonate anion is shown to be more reactive than oxalate anion for decarboxylation when both are present in a cluster. The energetics of several representative cluster phase reactions are evaluated using computational modeling. The present results for cationic clusters are compared and contrasted to earlier studies of anionic sodiated dicarboxylic acid clusters.

Original languageEnglish
Pages (from-to)5954-5967
Number of pages14
JournalJournal of Physical Chemistry A
Volume111
Issue number27
DOIs
Publication statusPublished - 2007 Jul 12
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Cluster phase chemistry: Collisions of vibrationally excited cationic dicarboxylic acid clusters with water molecules initiate dissociation of cluster components'. Together they form a unique fingerprint.

  • Cite this