In the presented paper we investigated a 2-pyridylthiazole derivative, 4-phenyl-2-(2-pyridyl)thiazole (2-PTP), as the molecular fluorescent switches. It was firstly found that 2-PTP could perform a “turn-on” fluorescent sensing for Fe(III) with selectivity and reversibility. A 2:1 stoichiometry between 2-PTP and Fe(III) was determined according to the molar ratio method. The binding constant was evaluated as (1.90 ± 0.05) × 105 (L/mol)2. The detection limit was found as 2.2 × 10−7 M (S/N = 3). Secondly, 2-PTP also exhibited a pH-dependent dual-emission. The pK a(2-PTP-H+/2-PTP) value was then estimated as 2.0. To explain the identical emission at 479 nm of both the Fe(III) coordinated form and the protonated form of the ligand, we proposed a “locked” conformation. Finally, combining the two external stimuli as inputs, an OR logic gate was constructed using the fluorescent emission at 479 nm as the output channel.
在本文中,我们研究了2-
吡啶基
噻唑衍
生物4-苯基-2-(2-吡啶基)噻唑(2-PTP)作为分子荧光开关。首先发现2-PTP能够对Fe(III)进行“开启”荧光传感,具有选择性和可逆性。根据摩尔比法,确定了2-PTP和Fe(III)之间的2:1
化学计量比。结合常数评估为(1.90±0.05)×105(L/mol)2。检测限为2.2×10-7M(S/N=3)。其次,2-PTP还表现出pH依赖性的双发射。然后,将pKa(2-PTP-H+/2-PTP)值估计为2.0。为了解释Fe(III)配位形式和
配体质子化形式在479nm处的相同发射,我们提出了“锁定”构象。最后,将两种外部刺激作为输入,构建了一个OR逻辑门,以479nm处的荧光发射作为输出通道。