Friday, 27 October 2006 - 8:35 AM
OLCC-Lindsay (Oakley-Lindsay Center)
224

Investigation of gas-phase vanadyl-alkoxide complexes using tandem mass spectrometry

Zach Parsons and Mike Van Stipdonk. Wichita State University, Wichita, KS

Electrospray ionization (ESI), tandem-mass spectrometry, and collision-induced dissociation (CID) were used in this study to generate and investigate vanadyl [VO2+] complexes containing various alkoxide and nitrile ligands. The precursor ions explored were of the general formula [VO(RO)(L)2]+, where RO represents an alkoxide generated from its respective alcohol (methoxide, ethoxide, 1-propoxide, or 1-butoxide) and L represents one of the following nitrile ligands: acetonitrile, propionitrile, butyronitrile, or benzonitrile. These precursor ions were isolated and subjected to CID, which produced various fragmentation pathways, respective to the coordinated alkoxide. When dissociated, all precursor ions exhibited the elimination of a single nitrile ligand, followed by the addition of H2O or O2, such that the general formulae of the fragment ions at the MS2 stage were [VO(RO)(L)]+, [VO(RO)(L)(H2O)]+, and [VO(RO)(L)(O2)]+. CID of [VO(RO)(L)]+ resulted in fragmentation pathways exclusive to the alkoxide present in the molecule, though similarities exist among complexes containing ethoxide, 1-propoxide, and 1-butoxide; such as a loss of H2 and the subsequent formation of an enolate ligand from the alkoxide. Complexes containing 1-butoxide exhibited exclusive CID pathways involving the production of methoxide-containing complexes as well as complexes containing ethynoxide.

 


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