Murphy, M. K. and Beauchamp, J. L. (1977) Fluorine and alkyl substituent effects on the gas-phase Lewis acidities of boranes by ion cyclotron resonance spectroscopy. Inorganic Chemistry, 16 (10). pp. 2437-2443. ISSN 0020-1669. doi:10.1021/ic50176a003. https://resolver.caltech.edu/CaltechAUTHORS:20160524-090314832
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Abstract
Formation of Lewis acid-base adducts R_3BF^- and R_2FBF^- in reactions of SF_5^- and SF_6^- with neutral boranes R_3B (R = CH_3, C_2H_5, i-C_3H_7, and F) is examined using trapped-ion cyclotron resonance techniques. Fluoride transfer reactions observed in binary mixtures of the various boranes (in the presence of traces of SF_6 acting as the source of F^-) establish the Lewis acidity order BF_3 > (i-C_3H_7)_2FB > (i-C_3H_7)_ 3B > (C_2H_5)_2FB > (C_2H_5)_3B > (CH_3)_2FB > (CH_3)_3B > SF_4 in the gas phase with F^- as reference base. Quantitative estimates of adduct bond dissociation energies D[R_3B-F^-] and heats of formation of adducts R_3BF^- are derived. Variations in Lewis acidity resulting from alkyl and fluoro substitution on boron are discussed in terms of properties characteristic of substituents and the anion reference base.
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| Additional Information: | © 1977 American Chemical Society. This work was supported in part by the Energy Research and Development Administration under Grant No. E(04-3)767-8. The spectrometer used for these experiments was funded in part by the National Science Foundation under Grant No. NSF-GP-18383. | |||||||||
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| Issue or Number: | 10 | |||||||||
| DOI: | 10.1021/ic50176a003 | |||||||||
| Record Number: | CaltechAUTHORS:20160524-090314832 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160524-090314832 | |||||||||
| Official Citation: | Fluorine and alkyl substituent effects on the gas-phase Lewis acidities of boranes by ion cyclotron resonance spectroscopy M. K. Murphy and J. L. Beauchamp Inorganic Chemistry 1977 16 (10), 2437-2443 DOI: 10.1021/ic50176a003 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 67291 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 24 May 2016 16:39 | |||||||||
| Last Modified: | 11 Nov 2021 00:30 |
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