Solvent‐derived metal oxides in electrospray mass spectrometry of metal salt solutions

Abstract

The electrospray mass spectra of MX, and MX, salts (where X is typically halide or nitrate) in protic and aprotic solvents, and solvent mixtures were examined. Comparisons of species responses with equilibrium aqueous solution concentrations were made. For MX, salts, a good correlation between MOH' response and MOH' solution concentration was observed under conditions where the collision energy was nominally zero. Cu(I1) is easily reduced in acetonitrile to Cu(1); Cu(1) was the principal species observed in the electrospray mass spectrum of Cu(I1) in acetonitrile whereas Cu(I1) was the principal species observed in that of Cu(I1) in dimethyl sulphoxide. Gas-phase reactions between solvated clusters produced by electrospray and a second solvent vapour were examined. M3 + clusters were the principal ions observed when an aqueous solution of MX, was sprayed in the presence of aprotic solvent vapours. EXPERIMENTAL InstrumentationExperiments were performed on a SCIEX TAGA Model 6000E triple quadrupole mass spectrometer with an upper mass limit of -1400 m/z. The electrospray Crown copyright (Canada)

Preferential Activation of Primary CH Bonds in the Reactions of Small Alkanes with the Diatomic MgO+. Cation

“…[59] Briefly, the MgO + C title ion was generated by means of the ESI of aqueous Mg-A C H T U N G T R E N N U N G (NO 3 ) 2 under enforced ionization conditions, [7,56,57,60] mass-selected using Q1, allowed to interact with the neutral gases of interest at a pressure of % 10 À4 mbar, and the ionic products were then mass-analyzed using Q2. To probe the conceivable formation of low-mass ions, the Q2 scans were started at m/z 10.…”

Low‐Temperature Activation of Methane: It also Works Without a Transition Metal

“…[25,26] Thereby, ESI provides a straightforward route for the generation of gaseous [MgO] + in yields fully sufficient for reactivity studies.…”

Gas‐Phase Model Studies Relevant to the Decomposition of Transition‐Metal Nitrates M(NO3)2 (M = Co, Ni) into Metal–Oxo Species

“…[7][8][9][10][11][12] With respect to a more detailed understanding at a molecular level, model studies of well-defined metal nitrate species in the idealized gas phase might therefore provide an alternative means to gather additional insight. In the gas phase, nitrato ligands can also be used as donors for oxygen atoms and several reactive metal oxide species have been prepared through this route by using electrospray ionization (ESI) of aqueous solutions of the corresponding nitrates, [13,14] for example, MgO + , [15] FeO + , [16] (1,10-phenanthroline)CuO + , [17] and Ag 2 O + . [18] ESI is known as a method that allows the gentle transfer of ionic species in solution to the gas phase.…”