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Gas Phase Ligation Kinetics of Metal Monocations with Pyrene

Saša Kazazić
Snježana P. Kazazić
Leo Klasinc
Marko Rožman
Dunja Srzić

Puni tekst: engleski pdf 138 Kb

str. 269-274

preuzimanja: 755



The gas-phase ligation of M+ ions with pyrene is reviewed. The M+ (M = Al, K, V, Cr, Fe, Co, Ni, Cu, Nb, Mo, Ru, Ag, Sn, Ta, W, Re, Pt, Au, Hg, Pb, Bi and U) were produced by a single laser shot. Gaseous pyrene was already present in the Fourier transform mass spectrometer (FTMS). The reaction proceeded by consecutive ligations, sometimes accompanied by expulsion of a part (usually H2) of the ligand. Charge transfer (when the neutral metal has a higher ionization energy than the pyrene), pyrene dimerization, oxidation by residual oxygen, and protonation by ubiquitous water in the instrument may also take place. Reaction progression was followed by varying the delay time between the shot and the mass-spectrometric assay of the ions. If electronically-excited M+, which might have been produced by the laser pulse, was interfering with the reaction, these ions and their products were swept out of the FTMS chamber prior to initiation of the time delay specified above.

Ključne riječi

ligation reaction; charge exchange reaction; gas phase kinetics; metal monocations; pyrene

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