A Dual-Emissive Phosphine-Borane Lewis Pair with a U-Shaped Linker: Impact of Methylation and Complexation on Fluoride Binding Affinity
A Dual-Emissive Phosphine-Borane Lewis Pair with a U-Shaped Linker: Impact of Methylation and Complexation on Fluoride Binding Affinity
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DOI：
10.1021/om4011406
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发表时间：
2014-02-24
期刊：
影响因子：
2.8
通讯作者：
Wang, Suning
中科院分区：
文献类型：
--
作者：
Li, Yufei;Kang, Youngjin;Wang, Suning
为了研究膦-硼烷通过空间电荷转移及其在阴离子传感和金属配合物形成中的应用，合成了一个由u形连接剂连接的膦-硼烷刘易斯对(1)。1可以很容易地转化为磷盐(2)和两个2:1配合物与Au(I) （1-Au）和Pt(II) （1-Pt）。对新化合物的光物理性质进行了测试和比较。化合物1显示出强烈的P - >b CT跃迁和明亮的溶剂依赖性双发射，可被氟离子切换。2和1-Pt分别对氟离子表现出关闭和打开的荧光反应。2与F-的结合常数比1的结合常数大2个数量级。提出了1、2和1- pt对氟离子的不同荧光响应的机制。
To investigate phosphine to borane through-space charge transfer and its utility in anion sensing and the formation of metal complexes, a phosphine-borane 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 -> 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- 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.