A Dual-Emissive Phosphine鈥揃orane Lewis Pair with a U-Shaped Linker: Impact of Methylation and Complexation on Fluoride Binding Affinity

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• 作者：Yufei Li ; Youngjin Kang ; Jia-Sheng Lu ; Ian Wyman ; Soo-Byung Ko ; Suning Wang
• 刊名：Organometallics
• 出版年：2014
• 出版时间：February 24, 2014
• 年：2014
• 卷：33
• 期：4
• 页码：964-973
• 全文大小：591K
• 年卷期：v.33,no.4(February 24, 2014)
• ISSN：1520-6041

文摘

To investigate phosphine to borane through-space charge transfer and its utility in anion sensing and the formation of metal complexes, a phosphine鈥揵orane Lewis pair (1) connected by a U-shaped linker has been synthesized. 1 could be readily converted to a phosphonium salt (2) and two 2:1 complexes with Au(I) (1-Au) and Pt(II) (1-Pt). The photophysical properties of the new compounds were examined and compared. Compound 1 displayed an intense P 鈫?B CT transition and a bright solvent-dependent dual emission that is switchable by fluoride ions. 2 and 1-Pt showed a turn-off and a turn-on fluorescent response, respectively, toward fluoride ions. The binding constant of 2 with F^{鈥?/sup> was found to be 2 orders of magnitude greater than that of 1. The mechanism that is responsible for the distinct fluorescence response of 1, 2, and 1-Pt toward fluoride ions is proposed.}