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Rechecking of the equilibrium gas‐phase basicity scale for low‐basicity compounds using fourier transform ion cyclotron resonance spectrometry
Author(s) -
Koppel Ilmar A.,
Anvia Frederick,
Taft Robert W.
Publication year - 1994
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.610071210
Subject(s) - chemistry , fourier transform ion cyclotron resonance , ion cyclotron resonance , mass spectrometry , gas phase , fourier transform , ion , substituent , analytical chemistry (journal) , selected ion monitoring , resonance (particle physics) , proton , cyclotron , gas chromatography–mass spectrometry , chromatography , organic chemistry , atomic physics , mathematical analysis , physics , mathematics , quantum mechanics
Fourier transform ion cyclotron resonance (FT‐ICR) spectrometry was used to study and recheck the proton transfer equilibria for a large number of low‐basicity compounds, particularly those which are less basic than H 2 O. The data obtained were used for the construction of a continuous scale of the relative gas‐phase basicities between H 2 S and SO 2 F 2 . The present results are compared with the results obtained by McMahon and co‐workers using ICR spectrometry and high‐pressure mass spectrometric (HPMS) techniques. Satisfactory agreement is found with the existing ICR spectrometric data. The results, however, show unexplained variances with earlier and recent HPMS results that also not internally self‐consistent. The substituent effects for some families of low‐basicity compounds (nitriles, carbonyl compounds, ethers and some others) are discussed.