ESIPT based dual fluorescent sensor and concentration dependent reconfigurable boolean operators
作者:Vijay Luxami、Subodh Kumar
DOI:10.1039/c2ra21170j
日期:——
Probes 1 and 2 (CH3CN–H2O; 4 : 1) at pH 7.0 ± 0.1 (10 mM, HEPES) selectively bind with Zn2+ ions and give a new emission band at 490 nm. These can estimate 20 nM Zn2+ ions as the lowest detection limit. The determination of Zn2+ ions by probe 1 is not interfered by the presence of other metal ions viz. Na+, K+, Mg2+, Ca2+, Sr2+, Fe2+, Co2+, Ni2+, Cd2+, Ag+, Hg2+. However, in the case of probe 2 Cu2+ causes only the fluorescence quenching. In acetonitrile, the addition of different concentrations of Cu2+ (2 μM, 5 μM, 10 μM) and a fixed amount of F− (25 μM) to a solution of 2 (0.25 μM, CH3CN) elaborates Cu2+ ion concentration dependent NOR, INH and AND Boolean operators with three distinct emission channels at 585, 515 and 400 nm, respectively.
探针 1 和 2(CH3CN-H2O;4:1)在 pH 值为 7.0 ± 0.1(10 mM,HEPES)时可选择性地与 Zn2+ 离子结合,并在 490 nm 处产生新的发射带。由此可以估计出 20 nM 的 Zn2+ 离子是最低检测限。探针 1 对 Zn2+ 离子的测定不受其他金属离子(即 Na+、K+、Mg2+、Ca2+、Sr2+、Fe2+、Co2+、Ni2+、Cd2+、Ag+、Hg2+)的干扰。然而,探针 2 中的 Cu2+ 只导致荧光淬灭。在乙腈中,向 2 的溶液(0.25 μM,CH3CN)中加入不同浓度的 Cu2+(2 μM、5 μM、10 μM)和一定量的 F-(25 μM),会产生与 Cu2+离子浓度相关的 NOR、INH 和 AND 布尔运算,分别在 585、515 和 400 纳米波长处有三个不同的发射通道。