Weakly coordinating nature of a carborane cage bearing different halogen atoms. Synthesis and structural characterization of icosahedral mixed halocarborane anions, 1-H-CB11Y5X6- (X, Y=Cl, Br, I)
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AbstractMixed halocarborane anions, 1-H-CB11Y5X6- (X, Y = Cl, Br, I), have been prepared by treatment of [Me3NH]-[1-H-CB11H5X6] (X = Cl, Br, I) with proper halogenating reagents at 180-220 degreesC in a sealed tube in high yield. These new anions are fully characterized by H-1, C-13, and B-11 NMR, IR, and negative-ion MALDI MS spectroscopy. Some are further confirmed by single-crystal X-ray analyses. The weakly coordinating nature of these anions is probed by Si-29 chemical shifts of the resulting Pr3Si(1-H-CB11Y5X6) compounds. The results suggest that the coordinating ability of these anions is mainly dependent on the substituents at 7-12 positions (namely, X atoms), and the contribution from the upper belt substituents Y is relatively small. These suggestions are consistent with the results obtained from the structural study of silver salts of mixed halo- and perhalocarborane anions.
All Author(s) ListTsang CW, Yang QC, Sze ETP, Mak TCW, Chan DTW, Xie ZW
Journal nameInorganic Chemistry
Year2000
Month12
Day11
Volume Number39
Issue Number25
PublisherAMER CHEMICAL SOC
Pages5851 - 5858
ISSN0020-1669
eISSN1520-510X
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Inorganic & Nuclear; CHEMISTRY, INORGANIC & NUCLEAR

Last updated on 2020-21-05 at 03:24