Electron impact (EI) and fast-atom bombardment (FAB) mass spectra of coordination complexes: aggregation processes in the mass spectra of metal derivatives of 1,2,3,4,5-pentakis-(methoxycarbonyl)cyclopentadiene

✍ Scribed by Michael I. Bruce; Michael J. Liddell

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 548 KB
• Volume: 198-200
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)92383-1

✦ Synopsis

The mass spectra of HC,(CO,Me), [H(cpp)] and several of its metal derivatives have been studied. In the EI mass spectra of alkali metal salts, aggregate ions [mJcpp)]+ were observed. The abundance of these and higher oligomers is increased in FAB mass spectra, ions containing up to seven (negative ion) or eight (positive ion) metal atoms being found. Fragmentation patterns were established for the diene and Ru(q-C,H,){q'-C,(Co,Me),) by high resolution EI measurements. Unusual replacement of CO,Me by H (by loss of CO+CH,O) occurred in the latter, eventually to give [Ru(C,H,)(C,H,)]+.