Synthesis of charged phenyl radicals and biradicals by laser photolysis in a Fourier-transform ion cyclotron resonance mass spectrometer
| Autor: | James Pérez, Hilkka I. Kenttämaa, Joseph J. Ferra, Kami K. Thoen |
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| Rok vydání: | 1998 |
| Předmět: |
Photolysis
Fourier Analysis Free Radicals Radical Biphenyl Compounds Photodissociation Analytical chemistry Substituent Cyclotrons Photochemistry Mass spectrometry Mass Spectrometry Dissociation (chemistry) Fourier transform ion cyclotron resonance chemistry.chemical_compound Phenols chemistry Radical ion Structural Biology Spectroscopy Ion cyclotron resonance |
| Zdroj: | Journal of the American Society for Mass Spectrometry. 9:1135-1140 |
| ISSN: | 1044-0305 |
| Popis: | The feasibility of generating substituted phenyl radicals and biradicals (with a charged substituent) in the gas phase by laser photolysis was examined by using a Fourier-transform ion cyclotron resonance mass spectrometer. The precursors were generated by ipso-substitution of a halogen atom in the radical cation of a di- or trihalobenzene by various nucleophiles. Photolytic cleavage of the remaining carbon-halogen bond(s) with 266-nm radiation was found to produce many substituted phenyl radicals in greater yields than the earlier employed method, sustained off-resonance irradiated collision-activated dissociation (SORI-CAD). Furthermore, ion generation by photolysis leads to isomerization less often than collisional activation. Finally, not only phenyl-bromine and phenyl-iodine but also certain phenyl-chlorine bonds can be cleaved by photolysis, whereas the synthetic utility of SORI-CAD appears to be largely limited to the cleavage of phenyl-iodine bonds. Hence, laser photolysis greatly expands the variety of substituted phenyl radicals and biradicals that can be synthesized inside a mass spectrometer. |
| Databáze: | OpenAIRE |
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