Fast Atom Bombardment Tandem Mass Spectrometry of Organometallic Palladium Complexes Containing Terdentate Nitrogen Ligands

Abstract

Fast atom bombardment and collisonal-induced dissociation tandem mass spectrometry were used to analyze 12 cationic organometallic palladium [Pd(L)(R)I(OTD complexes containing three different terdentate nitrogen ligands (L), an organic group (R) attached in the o bonding mode, and a trifluoromethanesulfonate anion (OTf is CF3S03-) using m-nitrobenzyl alcohol as a matrix. FAB ionization gives abundant Pd(L)(R) cations and some fragment ions. Tandem mass spectrometry of collisionally activated monoisotopic lo8Pd(L)( R) cations affords additional information on fragmentation mechanisms and enables discrimination between isomeric complexes. The MSNS experiments also provided evidence for the occurrence of a n abundant gas-phase cyclopalladation reaction of the losPd(L)(R) cations by activation of a sp3 C-H bond according to a n oxidative additiodreductive elimination or a multicentered pathway.

Characterization of inorganic coordination complexes by matrix‐assisted laser desorption/ionization mass spectrometry

“…Significant advances have been made with fast‐atom bombardment (FAB)8,, 9 and electrospray‐ionization (ESI) mass spectrometry,10–14 although these techniques still have limitations. FAB‐MS has been successful for monometallic and small polymetallic compounds, but fragmentation often causes a low intensity or complete absence of the molecular ion 15–17…”

The behaviour of [Pt(η3-allyl)XP(C6H5)3] complexes in electrospray ionization conditions compared with those achieved by other ionization methods

“…Furthermore, the ability to select and trap ions in a defined region of space with relatively simple devices (ion traps) 4 has made it possible to perform collisional experiments and/or gasphase ion-molecule reactions on isolated organometallic ionic species. 5 More recently, the development of electrospray ionization (ESI) 6 has further increased such interest.Recently the power of ESI in the organometallic field has been critically reviewed and discussed by Colton et al. 7 In their paper the behaviour of many classes of inorganic and organometallic compounds has been exhaustively described and the ionization mechanisms, leading to the production of ions from solutions, have been discussed in detail.…”