Effects of molecular geometry on the fragmentation of ionized maleic and fumaric acids; an overdue reappraisal

✍ Scribed by Hongwen Chen; John L. Holmes

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 527 KB
• Volume: 30
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/jms.1190300804

✦ Synopsis

Abstract

The ionized geometric isomers maleic and fumaric acids ((Z)‐ and (E)‐ethenedicarboxylic acids) were studied by a variety of tandem mass spectrometric techniques. In agreement with much earlier work, the metastable ionized isomers do not reversibly interconvert. They do, however, have two dissociation channels, H~2~O and CO losses, for which common transition states are involved. Ionized maleic acid has one geometry‐specific dissociation, loss of CO~2~. Structures were assigned to all major fragment ions together with their heats of formation.