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Gas Phase Ligation Kinetics of Metal Monocations with Pyrene

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Polje Vrijednost
 
Naslov Gas Phase Ligation Kinetics of Metal Monocations with Pyrene
Kinetike ligacije metalnih monokationa s pirenom u plinskoj fazi
 
Autor Kazazić, Saša
Kazazić, Snježana P.
Klasinc, Leo
Rožman, Marko
Srzić, Dunja
 
Tema ligation reaction; charge exchange reaction; gas phase kinetics; metal monocations; pyrene
 
Opis 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.
Istraživana je ligacija različitih metalnih monokationa M+ s pirenom u plinskoj fazi. 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) nastaju pojedinačnim udarima lasera na metalne mete unutar spektrometra masa uz Fourierovu transformaciju (FTMS) u kojem je već prisutan piren u plinskoj fazi. Do ligacije dolazi konsekutivnim adicijama uz ili bez gubitka dijela (obično H2) liganda. Ukoliko je energija ionizacije metala veća od energije ionizacije pirena dolazi do izmjene naboja. Također se opažaju reakcije dimerizacije, oksidacije s preostalim kisikom i protoniranje s prisutnom vodom u instrumentu. Napredovanje reakcija je praćeno snimanjem svih iona uz različita vremena zadržavanja u spektrometru nakon (i) udara lasera; (ii) dodatnoga izbacivanja trenutno stvorenih produkata s elektronički pobu|enim M+.
 
Izdavač Croatian Chemical Society
 
Datum 2005-06-15
 
Vrsta resursa text
 
Format (na primjer PDF) pdf
 
Identifikator http://hrcak.srce.hr/21
http://hrcak.srce.hr/file/21
 
Izvor Croatica Chemica Acta (cca@chem.pmf.hr); Vol.78 No.2; ISSN 0011-1643 (Print); ISSN 1334-417X (Online)
 
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Prava Parts of the contents of Croat. Chem. Acta (e. g. figures or tables) may be reproduced without prior permission, provided reference is made to their source.