title: Fluorescent Sensing of both Fe(III) and pH Based on 4-Phenyl-2-(2-Pyridyl)Thiazole and Construction of OR Logic Function.
abstract: 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) × 10(5) (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.
authors.affiliation: Department of Chemistry, Yanbian University, Yanji city, Jilin, Province, 133002, China.
authors.forename: Ming-Yang
authors.initials: MY
authors.lastname: Yang
authors.affiliation: Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, Yanbian University, Yanji city, Jilin, Province, 133002, China.
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, Yanbian University, Yanji city, Jilin, Province, 133002, China. zhengmh@ybu.edu.cn.|Research Centre of Chemical Biology, Yanbian University, Yanji city, Jilin, Province, 133002, China. zhengmh@ybu.edu.cn.
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Zheng
authors.affiliation: Research Centre of Chemical Biology, Yanbian University, Yanji city, Jilin, Province, 133002, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, Yanbian University, Yanji city, Jilin, Province, 133002, China. jyjin-chuppem@ybu.edu.cn.|Research Centre of Chemical Biology, Yanbian University, Yanji city, Jilin, Province, 133002, China. jyjin-chuppem@ybu.edu.cn.
authors.forename: Jing-Yi
authors.initials: JY
authors.lastname: Jin
keywords: 2-pyridylthiazole; Fe(III); Fluorescence; OR logic gate; pH