near-infrared fluorescent probe (L) based on a 1,4-diethyl-1,2,3,4-tetrahydro-7H-pyrano[2,3-g]quinoxalin-7-one scaffold has been synthesized and characterized. Probe L displays highly selective and sensitive recognition to H2S over various anions and biological thiols with a large Stokes shift (125 nm) in THF/H2O (6/4, v/v, Tris–HCl 10 mM, pH = 7.4). This probe exhibits turn-onfluorescence for H2S through HS−
合成了一种基于 1,4-diethyl-1,2,3,4-tetrahydro-7 H - pyrano[2,3 - g ]quinoxalin-7-one 支架的新型近红外荧光探针 ( L ),并表征。探针L在 THF/H 2 O(6/ 4,v/v,Tris-HCl 10 mM,pH = 7.4)。该探针通过 HS -诱导的二硝基苯醚硫解显示 H 2 S的开启荧光。用L孵育的 MCF-7 细胞的共聚焦激光扫描显微照片证实L具有细胞渗透性,可以成功检测活细胞中的H 2 S。
tetrahydroquinoxaline donor into borondifluoride complexes largely extended their emissions (617-684 nm), highly improved their fluorescence quantum yields (up to 0.68) and greatly increased their Stokesshifts (up to 209 nm). These new fluorescent dyes showed reversible ratiometric solid-state fluorescence changes upon switched acid/base fumings. Significantly, these borondifluoride complexes were successfully