Structure and Characterization of CI3+[Al{OC(CF3)3}4]−; Lewis Acidities of CX3+ and BX3

Where is the charge? The positive charge of the CI3+ ion in CI3+[Al{OC(CF3)3}4]− is located exclusively on the I atoms (see resonance structures B–D), and not on the formal carbenium center A. According to calculations and experimental findings, the Lewis acidity of the CX3+ homologues (X=F–I) versu...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2003-04, Vol.42 (13), p.1531-1534
Main Authors: Krossing, Ingo, Bihlmeier, Angela, Raabe, Ines, Trapp, Nils
Format: Article
Language:English
Subjects:
acidity
boron
cations
halogens
Lewis acids
Online Access:Get full text
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Summary:Where is the charge? The positive charge of the CI3+ ion in CI3+[Al{OC(CF3)3}4]− is located exclusively on the I atoms (see resonance structures B–D), and not on the formal carbenium center A. According to calculations and experimental findings, the Lewis acidity of the CX3+ homologues (X=F–I) versus fluoride is reversed in comparison to that of the isoelectronic boron halides BX3, and decreases from CF3+ to CI3+.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200250172