期刊
DALTON TRANSACTIONS
卷 -, 期 42, 页码 9169-9175出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b913030f
关键词
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资金
- National Science Foundation [CHE-0646916]
- Welch Foundation [A-1423]
- Petroleum Research Funds [44832-AC4]
- US Army Medical Research Institute of Chemical Defense
As part of our interest in chemistry of cationic boron compounds as anion receptors, we have synthesized 2-(4'-dimestylborylphenyl)-N-methyl-pyridinium triflate ([3]OTf) and 2-(5'-dimesitylborylthiophen-2'-yl)-N-methyl-pyridinium triflate ([4]OTf) by reaction of the corresponding pyridyl derivatives with MeOTf. Both [3] OTf and [4] OTf extract fluoride ions biphasically (H2O/CHCl3) to form the zwitterionic fluoroborates 3-F and 4-F, which have been structurally characterized. Remarkably, fluoride binding induces a red-shift of the low energy absorption band of these boranes (from 319 nm to 368 nm for 3/3-F and from 355 nm to 430 nm for 4/4-F) leading to the appearance of a yellow color. The origin of this turn-on colorimetric response is attributed to an intramolecular charge transfer process involving the triorganofluoroborate moiety as the donor and the pyridinium moiety as the acceptor.
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