Journal
DALTON TRANSACTIONS
Volume 40, Issue 44, Pages 11758-11764Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt11064k
Keywords
-
Categories
Funding
- National Research Foundation of Korea [2010-0008264, 2010-0007796]
- NRF [2009-0093818]
- Korea Ministry of Education, Science and Technology
Ask authors/readers for more resources
A triarylborane (2) bearing three o-carborane cages at peripheral positions on the aryl groups was prepared and its crystal structure was determined from X-ray diffraction study. Treatment of 2 with KF in the presence of 18-crown-6 led to the potassium salt, [2F](-). A UV-vis titration experiment carried out in THF/H2O (9/1 v/v) showed that 2 binds fluoride ions with a binding constant (K) of 4.8 x 10(4) M-1, which is an order-of-magnitude greater than K for the mono-carborane substituted triarylborane. The enhanced fluoride ion affinity of 2 indicates an apparent additive effect of multiple carborane substitutions on the Lewis acidity enhancement of the triarylborane. The highly Lewis acidic nature of 2 was further utilized in evaluating the fluoride ion affinity of tris(pentafluorophenyl) borane (B(C6F5)3). A fluoride exchange reaction between [2F](-) and B(C6F5)(3) resulted in 15 times higher fluorophilicity for B(C6F5)(3) than for 2. The lower Lewis acidity of 2 compared with B(C6F5)(3) was confirmed from its greater cathodic reduction potential.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available