کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1195774 964411 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Observation of Phenyl-Fused Porphyrinoids During the ESI Mass Spectrometric Analysis of meso-Pentafluorophenyl-Substituted Porphyrin and Corrole
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Observation of Phenyl-Fused Porphyrinoids During the ESI Mass Spectrometric Analysis of meso-Pentafluorophenyl-Substituted Porphyrin and Corrole
چکیده انگلیسی

The results of ESI(+) and ESI(−) mass spectrometry/mass spectrometry investigations of meso-tetrakisphenylporphyrin (TPP) and meso-trisphenylcorrole (TPC) in comparison with their meso-tetrakis(pentafluorophenyl)-substituted analogs TFPP and TFPC are reported. The fragmentation patterns of TPP and TPC show the expected loss of meso-aryl radicals. Analyzing the meso-pentafluorophenyl substituted analogs TFPP and TFPC, we found ESI(−) to be an excellent ionization mode. Rich and well-defined HF-elimination fragmentation patterns unique to the presence of meso-tetrafluorophenyl groups and evocative for the formation of fragments with direct covalent o-phenyl-to-β-linkages are observed. A computation of the feasibility and relative energies of the resulting species corroborates the interpretation of the experimental findings. The computations indicate the presence of cooperative interactions between the linkages that direct the linkage formations to occur in a unidirectional fashion. MS/MS/MS experiments also provide indications for the regioselectivity of the fusions. Our observations further detail earlier reports of similar HF-eliminations and allow a generalization of the findings. The results presented may also point to strategies towards the bulk synthesis of novel porphyrinoid structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the American Society for Mass Spectrometry - Volume 17, Issue 9, September 2006, Pages 1306–1314
نویسندگان
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