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首页> 外文期刊>Chemistry: A European journal >Charge-transfer emission involving three-coordinate organoboron: V-shape versus U-Shape and impact of the spacer on dual emission and fluorescent sensing
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Charge-transfer emission involving three-coordinate organoboron: V-shape versus U-Shape and impact of the spacer on dual emission and fluorescent sensing

机译：涉及三坐标有机硼的电荷转移发射：V形与U形以及间隔物对双发射和荧光传感的影响

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摘要

New V-shaped bifunctional organosilicon compounds that contain an electron acceptor, B(Mes)(2), and an electron donor, N(1-naph)Ph, with the formulae Ph2Si{p-C6H4B(Mes)(2)}{p-C6H4N(1-naph)ph)} (1), Ph2Si{p-C6H4-(Mes)(2)}{p-biphenyl-N(1-naph)ph} (2), and Si{p-C6H4B(Mes)(2)}(2){p-C6H4N(1-naph)ph)}(2) (3) have been synthesized as model compounds for the investigation of through-space charge-transfer emission involving triarylboron and triarylamino centers. The photophysical properties of the new bifunctional organosilicon compounds are compared to two U-shaped compounds sBN and BN in which the boron acceptor and the amino donor groups are linked together by a rigid 1,10-naphthyl group. The results of our investigation establish that dual emission pathways, namely through-space donor-acceptor charge transfer and pi-pi* transitions coexist in the V-shaped molecules 1-3, while charge transfer emission is dominant in the U-shaped molecules. It is found that depending on the geometry of the linker and the B center dot center dot center dot N separation distance, the compound either displays dual emission bands simultaneously or single emission band. In addition, the dual emission pathways in these molecules can be selectively switched on or off by using fluoride ions. The sensitivity of response to fluoride ions by these molecules is also found to be highly dependent on the geometry of the linker and the B center dot center dot center dot N separation distance. The V-shaped molecules are found to be "turn-on" sensors to fluorides with a much higher sensitivity than the U-shaped molecules.
机译：新型V形双功能有机硅化合物，其包含一个电子受体B（Mes）（2）和一个电子供体N（1-naph）Ph，其分子式为Ph2Si {p-C6H4B（Mes）（2）} { p-C6H4N（1-naph）ph）}（1），Ph2Si {p-C6H4-（Mes）（2）} {p-联苯-N（1-naph）ph}（2）和Si {p- C6H4B（Mes）（2）}（2）{p-C6H4N（1-naph）ph）}（2）（3）已被合成为模型化合物，用于研究涉及三芳基硼和三芳基氨基的穿越空间的电荷转移发射中心。将新型双功能有机硅化合物的光物理性质与两个U形化合物sBN和BN进行了比较，其中硼受体和氨基供体基团通过刚性的1,10-萘基连接在一起。我们的研究结果表明，V型分子1-3中共存在双发射途径，即空间供体-受体电荷转移和pi-pi *跃迁，而U型分子则主要存在电荷转移发射。已经发现，取决于接头的几何形状和B中心点中心点中心点中心点N的分离距离，该化合物要么同时显示双发射带，要么显示单发射带。另外，这些分子中的双重发射途径可以通过使用氟离子选择性地打开或关闭。还发现这些分子对氟离子的响应的敏感性高度依赖于接头的几何形状和B中心点中心点中心点N分离距离。发现V形分子是氟化物的“开启”传感器，其灵敏度比U形分子高得多。

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