Conjugated Polymers Based on Carbazole and Tridentate Ligands as the "On-Off-On" Fluorescent Probes for Detection of Ni (II) Ion and Lysine.

IF 2.6 4区 化学 Q2 BIOCHEMICAL RESEARCH METHODS Journal of Fluorescence Pub Date : 2024-10-26 DOI:10.1007/s10895-024-03997-y
Yinshuang Chen, Yi Feng, Haoyue Luo, Xinai Chen, Hong Lei, Juhua Feng, Kuan Liu
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Abstract

Two novel conjugated polymers (polymer 1 and polymer 2) containing trisheterocyclic systems and carbazole as the copolymerization unit were synthesized by the Suzuki coupling reaction and characterized using NMR spectroscopy and other methods. 4'-(3,5-Dibromophenyl)-2,2':6',2''-terpyridine and 2,2'-(4-(3,5-dibromophenyl)pyridine-2,6-diyl)dithiazole were used as the recognizing units of the two polymers respectively. The polymers show blue-violet fluorescence when dissolved in THF. The ability of the polymers to identify anions and metal ions was investigated by fluorescence sensing tests. It was found that I- not only quenched the fluorescence but also undergone some redshift. Ni (II) efficiently quenched the fluorescence of the polymers, and polymer 2 recognized Ni2+ with higher specificity. UV-visible absorption titration experiments showed that Ni2+ formed complexes with the polymers. In addition, the formation of complexes between Ni2+ and polymers were used for the detection of amino acids, and it was found that lysine could regenerate the fluorescence of [polymer 1-Ni2+] and [polymer 2-Ni2+] with 99% fluorescence recovery.

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基于咔唑和三叉配体的共轭聚合物作为检测镍 (II) 离子和赖氨酸的 "开-关-开 "荧光探针。
通过铃木偶联反应合成了两种新型共轭聚合物(聚合物 1 和聚合物 2),其中含有三三环系统和咔唑作为共聚单元,并利用核磁共振光谱和其他方法对其进行了表征。4'-(3,5- 二溴苯基)-2,2':6',2''-三联吡啶和 2,2'-(4-(3,5-二溴苯基)吡啶-2,6-二基)二噻唑分别用作两种聚合物的识别单元。聚合物溶于 THF 时会发出蓝紫色荧光。通过荧光感应试验研究了聚合物识别阴离子和金属离子的能力。结果发现,I- 不仅会淬灭荧光,还会发生一些红移。Ni (II) 能有效地淬灭聚合物的荧光,聚合物 2 对 Ni2+ 的识别具有更高的特异性。紫外可见吸收滴定实验表明,Ni2+ 与聚合物形成了络合物。此外,还将 Ni2+ 与聚合物形成的络合物用于检测氨基酸,结果发现赖氨酸可以使[聚合物 1-Ni2+]和[聚合物 2-Ni2+]的荧光再生,荧光恢复率达 99%。
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来源期刊
Journal of Fluorescence
Journal of Fluorescence 化学-分析化学
CiteScore
4.60
自引率
7.40%
发文量
203
审稿时长
5.4 months
期刊介绍: Journal of Fluorescence is an international forum for the publication of peer-reviewed original articles that advance the practice of this established spectroscopic technique. Topics covered include advances in theory/and or data analysis, studies of the photophysics of aromatic molecules, solvent, and environmental effects, development of stationary or time-resolved measurements, advances in fluorescence microscopy, imaging, photobleaching/recovery measurements, and/or phosphorescence for studies of cell biology, chemical biology and the advanced uses of fluorescence in flow cytometry/analysis, immunology, high throughput screening/drug discovery, DNA sequencing/arrays, genomics and proteomics. Typical applications might include studies of macromolecular dynamics and conformation, intracellular chemistry, and gene expression. The journal also publishes papers that describe the synthesis and characterization of new fluorophores, particularly those displaying unique sensitivities and/or optical properties. In addition to original articles, the Journal also publishes reviews, rapid communications, short communications, letters to the editor, topical news articles, and technical and design notes.
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