| Dopant-assisted atmospheric pressure photoionization mass spectrometry of polyisobutylene derivatives initiated by mono- and bifunctional initiators. | |
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MedLine Citation:
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PMID: 19819723 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Nine polyisobutylene (PIB) derivatives with different end groups (chlorine, vinyl, isobutenyl, 2,2-diphenylvinyl, and carboxyl) and molecular weights (1000 to 4500 g/mol), initiated by monofunctional and aromatic bifunctional initiators were studied by atmospheric pressure photoionization mass spectrometry (APPI-MS) in both negative and positive ion modes. Consistent with previous findings, negative ion APPI-MS revealed end-group identities through the formation of PIB adducts with chloride ions formed in situ from a chlorinated solvent (e.g., CCl4) in the presence of a dopant (toluene). In positive ion mode, considerable fragmentation of these PIB derivatives was observed, rendering end-group determinations very difficult. The M(n) values obtained by APPI(-)-MS were considerably lower than those determined by SEC for PIB derivatives with M(n) higher than 2000 g/mol. PIBs containing carboxyl termini can undergo collision-induced dissociation, yielding structurally important product ions. The resulting APPI-MS/MS intensities were found to reflect the "arm-length" distribution for PIBs with bifunctional aromatic moieties. In positive ion mode, [M + COCl]+ adducts were observed for PIBs with an aromatic initiator moiety. The origin of the COCl+ species is also discussed. |
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Authors:
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Lajos Nagy; Vikt??ria P??lfi; Mijid Narmandakh; Akos Kuki; Andrea Ny??ri; B??la Iv??n; Mikl??s Zsuga; S??ndor K??ki |
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Publication Detail:
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Type: Journal Article Date: 2009-09-12 |
Journal Detail:
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Title: Journal of the American Society for Mass Spectrometry Volume: 20 ISSN: 1879-1123 ISO Abbreviation: J. Am. Soc. Mass Spectrom. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-11-25 Completed Date: 2010-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9010412 Medline TA: J Am Soc Mass Spectrom Country: United States |
Other Details:
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Languages: eng Pagination: 2342-51 Citation Subset: - |
Affiliation:
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Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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