School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Feb 15;287(Pt 2):122099. doi: 10.1016/j.saa.2022.122099. Epub 2022 Nov 9.
A fluorescence ''turn-on'' probe, namely, TTA-SBA-15, for the selective detection of water (HO) was designed by grafting terthiophene fluorophore onto ethylenediamine functionalized mesoporous SBA-15 silica. The maximum fluorescence emission peak of TTA-SBA-15 ranged from 462 nm (toluene) to 525 nm (methanol) in various organic solvents. No fluorescence was observed in HO due to the donor-excited photoinduced electron transfer mechanism, in which terthiophene acted as the donor and the amino group acted as the acceptor. Upon adding trace amounts of HO into the TTA-SBA-15 suspensions dispersed in various organic solvents, TTA-SBA-15 was successfully applied as a ''turn-on'' fluorescent probe for the quantitative determination of trace HO in organic solvents with high sensitivity and low detection limit. To demonstrate the selective detection mechanism of TTA-SBA-15 for HO, the fluorescent spectra of two control materials (TT-SBA-15 and PyA-SBA-15) were also investigated in HO and various organic solvents. The experimental results indicated that the terthiophene fluorophore and amine functional group on TTA-SBA-15 contributed to the HO selectivity, highlighting the structure-activity relationships in developing organic functionalized mesoporous silica for potential applications.
一种荧光“开启”探针，即 TTA-SBA-15，用于选择性检测水（HO），是通过将噻吩荧光团接枝到乙二胺功能化的介孔 SBA-15 硅上设计的。TTA-SBA-15 在各种有机溶剂中的最大荧光发射峰范围从 462nm（甲苯）到 525nm（甲醇）。由于供体激发光致电子转移机制，HO 中没有观察到荧光，其中噻吩作为供体，氨基作为受体。当将痕量 HO 添加到分散在各种有机溶剂中的 TTA-SBA-15 悬浮液中时，TTA-SBA-15 成功地用作“开启”荧光探针，用于在有机溶剂中以高灵敏度和低检测限定量测定痕量 HO。为了证明 TTA-SBA-15 对 HO 的选择性检测机制，还研究了两种对照材料（TT-SBA-15 和 PyA-SBA-15）在 HO 和各种有机溶剂中的荧光光谱。实验结果表明，TTA-SBA-15 上的噻吩荧光团和胺官能团有助于 HO 的选择性，突出了开发用于潜在应用的有机功能化介孔硅的结构-活性关系。
