School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , Wuhan 430074, China.
Langmuir. 2015 Jan 13;31(1):486-91. doi: 10.1021/la5040323. Epub 2014 Dec 24.
Ion-unquenchable and thermally on-off reversible room temperature phosphorescence (RTP) can be induced by entrapping 3-bromoquinoline (3-BrQ) into supramolecular gels formed by the self-assembly of a sorbitol derivative (DBS). In comparison with conventional substrates inducing RTP, the gel state 3-BrQ/DBS can produce strong RTP due to the efficient restriction of the vibration of 3-BrQ. Notably, the rather inconvenient deoxygenation is no longer necessary in the preparation of 3-BrQ/DBS gels. The produced RTP was found to be very fast to reach stable, not depending on the standing time. As a reference, in the liquid state of 3-BrQ/sodium deoxycholate (NaDC), stable RTP can be observed after standing for 5 h. The investigation of RTP quenching indicates that the mechanism of RTP induced by DBS gels mainly involves the microenvironment in which 3-BrQ is located. 3-BrQ was entrapped in the hydrophobic 3D network structure of DBS gels, thereby restricting the motion and collision of 3-BrQ and avoiding RTP quenching and additionally quenching by ions. Furthermore, the RTP of 3-BrQ/DBS gels show an excellent "on-off" effect at 10 or 80 °C. This indicates that the solid DBS gel is beneficial for the preparation of RTP sensor devices.
离子不灭和热关的室温磷光（RTP）可以通过将 3-溴喹啉（3-BrQ）包埋在由糖醇衍生物（DBS）自组装形成的超分子凝胶中来诱导。与传统的诱导 RTP 的基质相比，凝胶态 3-BrQ/DBS 由于 3-BrQ 的振动得到有效限制，因此可以产生强烈的 RTP。值得注意的是，在制备 3-BrQ/DBS 凝胶时，不再需要相当不方便的除氧。所产生的 RTP 被发现非常快达到稳定，不依赖于静置时间。作为参考，在 3-BrQ/脱氧胆酸钠（NaDC）的液态中，静置 5 小时后可以观察到稳定的 RTP。对 RTP 猝灭的研究表明，DBS 凝胶诱导 RTP 的机制主要涉及 3-BrQ 所处的微环境。3-BrQ 被包埋在 DBS 凝胶的疏水性 3D 网络结构中，从而限制了 3-BrQ 的运动和碰撞，避免了 RTP 猝灭和离子猝灭。此外，3-BrQ/DBS 凝胶的 RTP 在 10 或 80°C 时表现出出色的“开-关”效应。这表明固态 DBS 凝胶有利于制备 RTP 传感器设备。
