An ICT-FRET-based ratiometric fluorescent probe for hydrogen polysulfide based on a coumarin-naphthalimide derivative
作者:Shuangyu Liu、Xuan Zhao、Qiujuan Ma、Gege Wang、Shuqi Hou、Yijie Ma、Yujie Lian
DOI:10.1016/j.saa.2023.123041
日期:2023.12
recognition group. When H2Sn was not present in the system, the ICT process of the naphthalimide acceptor was inhibited and the FRET process from the coumarin donor to the naphthalimide acceptor was turned off. When H2Sn was added, both ICT and FRET occurred due to the nucleophilic substitution-cyclization reactions between the probe and hydrogen polysulfide. In addition, the ratio value of the emission intensities
多硫化氢(H 2 S n , n > 1)作为活性硫物种(RSS)的重要成员之一,在其生理和病理过程中发挥着重要作用。本工作基于分子内电荷转移(ICT)和荧光共振能量转移(FRET)的组合机制,设计并制备了H 2 S n比率荧光探针。该探针选择香豆素衍生物作为能量供体,萘二甲酰亚胺衍生物作为能量受体,2-氟-5-硝基苯甲酸酯作为H 2 S n识别基团。当系统中不存在H 2 S n时,萘二甲酰亚胺受体的ICT过程受到抑制,并且从香豆素供体到萘二甲酰亚胺受体的FRET过程被关闭。当添加H 2 S n时,由于探针与多硫化氢之间的亲核取代环化反应,ICT和FRET均发生。另外,该探针在550 nm和473 nm处的发射强度比值(I 550 nm/I 473 nm)与H 2 S n浓度在6.0 × 10 -7 -5.0范围内具有良好的线性关系。 × 10 -5 mol·L -1,检测限为1.8×10