溶液和固气界面中的超分子化学:用于无中微子双贝塔衰变中钡标记的单色和双色荧光传感器的合成和光物理特性。

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引用次数: 0

摘要

通过功能化表面将荧光传感器的光物理特性从溶液环境转化到固气环境是化学领域的一项挑战。在这项工作中,我们报告了两个系列的单色和双色荧光传感器的化学合成、钡捕获能力和光物理性质。制备这些传感器是为了捕获 Xe-136 的无中子双贝塔衰变中产生的钡阳离子。这些传感器包含冠醚单元、两种不同的荧光团、不同长度的脂肪族间隔物以及能与铟锡氧化物(ITO)表面形成共价键的硅烷连接体。这两种物质都具有出色的 Ba2+ 结合能力。基于萘基荧光团的荧光单色指示剂(FMIs)在溶液中显示出受光诱导电子转移控制的熄灭特性。基于苯并[a]咪唑并[5,1,2-cd]荧光团的荧光双色指示剂(FBIs)在从游离态变为钡结合态时,其发射光谱会发生显著变化。FMIs 和 FBIs 在溶液中和在 ITO 上都显示出相似的光物理特性。然而,与在溶液中获得的值相比,它们在 ITO 上的性能,无论是在强度方面还是在游离态和钡结合态之间的选择性方面,都有所减弱,但并没有完全消失。尽管存在这一问题,但根据直接附着分子的共聚焦显微镜观察,FBI 的性能有所提高。这些安装在定制功能化表面上的选择性 FMI 和 FBI 化学传感器是捕获 Xe-136 双贝塔衰变过程中产生的钡阳离子的有效工具。这种捕获的确定将提高搜索基于 Xe-136 的无中子双贝塔衰变实验的灵敏度,因为背景将几乎完全被抑制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Supramolecular chemistry in solution and solid–gas interfaces: synthesis and photophysical properties of monocolor and bicolor fluorescent sensors for barium tagging in neutrinoless double beta decay†

Supramolecular chemistry in solution and solid–gas interfaces: synthesis and photophysical properties of monocolor and bicolor fluorescent sensors for barium tagging in neutrinoless double beta decay†

Translation of photophysical properties of fluorescent sensors from solution to solid–gas environments via functionalized surfaces constitutes a challenge in chemistry. In this work, we report on the chemical synthesis, barium capture ability and photophysical properties of two families of monocolor and bicolor fluorescent sensors. These sensors were prepared to capture barium cations that can be produced in neutrinoless double beta decay of Xe-136. These sensors incorporate crown ether units, two different fluorophores, aliphatic spacers of different lengths, and a silatrane linker that forms covalent bonds with indium tin oxide (ITO) surfaces. Both species shared excellent Ba2+ binding abilities. Fluorescent monocolor indicators (FMIs), based on naphthyl fluorophores, showed an off–on character in solution controlled by photoinduced electron transfer. Fluorescent bicolor indicators (FBIs), based on benzo[a]imidazo[5,1,2-cd] fluorophores, exhibited a significant change in their emission spectra on going from the free to the barium-bound state. Both FMIs and FBIs showed similar photophysics in solution and on ITO. However, their performance on ITO was found to be attenuated, but not fully extinguished, with respect to the values obtained in solution, both in terms of intensity and selectivity between the free and Ba2+-bound states. Despite this issue, improved performance of the FBIs based on confocal microscopy of the directly attached molecules was observed. These selective FMI and FBI chemosensors installed on tailor-made functionalized surfaces are promising tools to capture the barium cations produced in the double beta decay of Xe-136. The identification of this capture would boost the sensitivity of the experiments searching for the Xe-136-based neutrinoless double beta decay, as backgrounds would be almost totally suppressed.

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