Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan.
Chem Asian J. 2022 Aug 15;17(16):e202200402. doi: 10.1002/asia.202200402. Epub 2022 Jun 30.
An afterglow is beneficial as an emission signal in the field of displays and imaging probes. Here, boronic acid-appended and spirolactam ring-containing rhodamine dye 1 was synthesized and grafted onto the surface of room-temperature phosphorescence-active boronate nanoparticles (BPs), composed of polymeric 3-benzo-2,4,8,10-tetraoxa-3,9-diboraspiro[5.5]undecane. The resultant ensemble, 1@BP, exhibited a greenish afterglow. However, the addition of Al into the dispersion solution with 1@BP led to a change in the afterglow to grass green as a result of Förster-type energy transfer from the phosphorescent BP to the Al -interacting rhodamine dye 1 on the surface. Based on the ratio of the two emission intensities, a linear response in the concentration range of 3.8-15.2 μM was observed, with a detection limit of 4.2 μM for Al . A metal ion-dependent discernable color in afterglow was observed on a 1@BP-coated filter paper, which would be useful for not only film-based afterglow chemosensors but also encryption application.
余晖作为一种发射信号在显示和成像探针领域很有应用价值。在这里，我们合成了一种含有硼酸基团和螺环内酰胺环的罗丹明染料 1，并将其接枝到由聚合的 3-苯并-2,4,8,10-四氧杂-3,9-二硼螺[5.5]十一烷组成的室温磷光活性硼酸盐纳米粒子（BPs）的表面上。所得的复合物 1@BP 表现出绿色的余晖。然而，当将 Al 添加到含有 1@BP 的分散溶液中时，由于磷光 BP 与表面上 Al 相互作用的罗丹明染料 1 之间的Förster 型能量转移，余晖的颜色从绿色变为草绿色。基于两种发射强度的比值，观察到在 3.8-15.2 μM 的浓度范围内呈线性响应，Al 的检测限为 4.2 μM。在涂有 1@BP 的滤纸上观察到余晖中金属离子依赖性的可分辨颜色，这不仅对基于膜的余晖化学传感器有用，而且对加密应用也有用。
