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Subtle structural variation in azine/imine derivatives controls Zn2+ sensitivity: ESIPT-CHEF combination for nano-molar detection of Zn2+ with DFT support

机译:嗪/亚胺衍生物的细微结构变化控制Zn2 +的灵敏度:ESIPT-CHEF组合物可通过DFT支持对Zn2 +进行纳摩尔检测

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Excited-state intra-molecular proton transfer (ESIPT)-active imine and azine derivatives, structurally characterised by XRD, and denoted L1 , L2 , L3 and L4 , possess weak fluorescence. The interaction of these probes with Zn ~(2+) turns ON the fluorescence to allow its nano-molar detection. Among the four ESIPT-active molecules, L2 , L3 and L4 are bis-imine derivatives while L1 is a mono-imine derivative. Among the three bis-imine derivatives, one is symmetric ( L3 ) while L2 and L4 are unsymmetrical. The lowest detection limits (DL) of L1 , L2 , L3 and L4 for Zn ~(2+) are 32.66 nM, 36.16 nM, 15.20 nM and 33.50 nM respectively. All the probes bind Zn ~(2+) (10 ~(5) M ~(?1) order) strongly. Computational studies explore the orbital level interactions responsible for the associated photo-physical processes.
机译:激发态分子内质子转移(ESIPT)活性亚胺和嗪衍生物在结构上以XRD表征,表示为L1,L2,L3和L4,具有弱荧光。这些探针与Zn〜(2+)的相互作用会开启荧光,从而实现纳米摩尔检测。在四个ESIPT活性分子中,L2,L3和L4是双亚胺衍生物,而L1是单亚胺衍生物。在三个双亚胺衍生物中,一个是对称的(L3),而L2和L4是不对称的。 Zn〜(2+)的最低检测限(DL)为L1,L2,L3和L4,分别为32.66 nM,36.16 nM,15.20 nM和33.50 nM。所有探针都与Zn〜(2+)(10〜(5)M〜(?1)级)牢固结合。计算研究探索了与相关的光物理过程有关的轨道水平相互作用。

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