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首页> 外文期刊>RSC Advances >A thiosemicarbazone based chemo and fluorogenic sensor for Zn2+ with CHEF and ESIPT behaviour: computational studies and cell imaging application
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A thiosemicarbazone based chemo and fluorogenic sensor for Zn2+ with CHEF and ESIPT behaviour: computational studies and cell imaging application

机译：基于硫代吡唑酮的Cecho和荧光传感器，具有厨师和eSipt行为：计算研究和细胞成像应用

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We report herein the development of a novel, diformyl- p -cresol ( DFC )–thiosemicarbazide ( TS ) based sensor ( DFC–TS ) that selectively and sensitively recognizes Zn ~(2+) by both UV-Vis and fluorescence methods. The gradual addition of Zn ~(2+) to a solution of the ligand developed a new absorption band at 430 nm, while the bands at 370 and 316 nm gradually decrease generating one well defined isosbestic point at 390 nm exhibiting ～17 fold turn-on fluorescent enhancement (FE). When we plot absorbance (at 430 nm) vs. [Zn ~(2+) ] there is a gradual increase in absorption with [Zn ~(2+) ], becoming saturated at ～1 equivalent of Zn ~(2+) and then again it increases with the increase in [Zn ~(2+) ] and ultimately becomes saturated at ～2 equivalents of added Zn ~(2+) . This clearly demonstrates that the Zn ~(2+) binding event to the ligand occurs in two steps, one at a time. Non-linear least-squares computer-fitting of these data gives the parameters: K ′ _(f1) = (9.70 ± 5.51) × 10 ~(5) M ~(?1) , n = (1.28 ± 0.05) for the first step and K ′ _(f2) = (1.11 ± 0.65) × 10 ~(5) M ~(?1) and n = (1.01 ± 0.06) for the second step. So far, this study provides the opportunity where we have successfully, for the first time, determined the stepwise formation constants; though they have values of the same order of magnitude. The ground state geometries of DFC–TS , both enol and keto forms and [Zn( DFC–TS )(OAc)], [Zn( DFC–TS )(OAc)] ~(?) , and [Zn _(2) ( DFC–TS )(OAc) _(2) ] were optimized using the Gaussian-03 suit program and bond distances of all species are in reasonable agreement with the reported values.
机译：我们在本文中报告了一种新颖的二甲基-C-溶解（DFC） - 硫代脲基于硫化物（TS）的传感器（DFC-TS），其通过UV-VI和荧光方法选择性和灵敏地识别Zn〜（2+）。 Zn〜（2+）的逐渐添加到配体的溶液中在430nm处开发出一种新的吸收带，而370和316nm的带逐渐减小在390nm下产生一个明确定义的isosbestic点，其表现出〜17倍关于荧光增强（Fe）。当我们绘制吸光度（在430nm）vs. [Zn〜（2+）]时，吸收逐渐增加[Zn〜（2+）]，饱和在〜1当量的Zn〜（2+）和然后随着[Zn〜（2+）]的增加，它增加了，最终在〜2当量的添加Zn〜（2+）中变得饱和。这清楚地证明了与配体的Zn〜（2+）结合事件发生在两个步骤中，一次发生在两个步骤中。这些数据的非线性最小二乘性计算机拟合给出了参数：k'_（f1）=（9.70±5.51）×10〜（5）m〜（？1），n =（1.28±0.05）第一步和k'_（f2）=（1.11±0.65）×10〜（5）m〜（Δ1），n =（1.01±0.06）进行第二步。到目前为止，本研究提供了我们成功的机会，首次确定逐步形成常数;虽然它们具有相同数量级的值。 DFC-TS，烯醇和酮形式的地态几何形式和[Zn（DFC-TS）]，[Zn（DFC-TS）（OAC）]〜（？）和[Zn _（2） （DFC-TS）（OAC）_（2）]使用Gaussian-03套装计划进行优化，所有物种的债券距离与报告的价值观合理一致。

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