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A poly(carbazole-alt-fluorene) π-conjugated polymer bearing thiophenyl benzimidazole: synthesis, characterization and fluorescence recognition of metal ions and cysteine
Polymer International ( IF 2.9 ) Pub Date : 2021-05-21 , DOI: 10.1002/pi.6257 Kuan Liu 1 , Yuhan Wei 1 , Jinyao Xu 1 , Lingfei Qiu 1 , Shaping Hu 1 , Jiayi Wan 1 , Juhua Feng 1
Polymer International ( IF 2.9 ) Pub Date : 2021-05-21 , DOI: 10.1002/pi.6257 Kuan Liu 1 , Yuhan Wei 1 , Jinyao Xu 1 , Lingfei Qiu 1 , Shaping Hu 1 , Jiayi Wan 1 , Juhua Feng 1
Affiliation
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A novel conjugated polymer PFCZ-IM containing 2-(thiophen-2-yl)-1H-benzo[d]imidazole units was synthesized and characterized. The basic photophysical properties of the polymer and its fluorescence recognition behaviors toward metal ions and amino acids were investigated. In the study of the response of metal ions, PFCZ-IM had high sensitivity to Fe3+, Ag+ and Cu2+, which significantly quenched the fluorescence of the polymer. The binding of the 2-(thiophen-2-yl)-1H-benzo[d]imidazole moiety to Cu2+ was investigated by density functional theory calculation. Interestingly, [PFCZ-IM-Cu2+] also exhibited outstanding characteristics of fluorescence ‘turn on’ in the presence of cysteine (Cys), as the interaction between Cu2+ and Cys caused the polymer to dissociate from the complex. In particular, addition of 30 μmol L–1 of Cys can increase the Cu2+-quenching fluorescence of PFCZ-IM by 34.8 times with short response time, demonstrating that [PFCZ-IM-Cu2+] has tremendous potential in the actual detection of Cys. This polymer is expected to be utilized for dual fluorescence detection of specific metal ions and Cys. © 2021 Society of Industrial Chemistry.
中文翻译：
含噻吩苯并咪唑的聚（咔唑-alt-芴）π-共轭聚合物：金属离子和半胱氨酸的合成、表征和荧光识别
合成并表征了一种含有 2-(噻吩-2-基)-1H-苯并[d] 咪唑单元的新型共轭聚合物 PFCZ-IM。研究了聚合物的基本光物理性质及其对金属离子和氨基酸的荧光识别行为。在金属离子响应的研究中，PFCZ-IM对Fe 3+、Ag +和Cu 2+具有较高的灵敏度，显着淬灭了聚合物的荧光。通过密度泛函理论计算研究了 2-(噻吩-2-基)-1H-苯并[d]咪唑部分与 Cu 2+ 的结合。有趣的是，[PFCZ-IM-Cu 2+] 在半胱氨酸 (Cys) 存在下，由于 Cu 2+和 Cys之间的相互作用导致聚合物从复合物中解离，因此还表现出荧光“开启”的突出特性。特别是加入30 μmol L –1的Cys 可使PFCZ-IM的Cu 2+猝灭荧光提高34.8 倍，响应时间短，表明[PFCZ-IM-Cu 2+ ] 在实际应用中具有巨大的潜力。 Cys的检测。该聚合物有望用于特定金属离子和 Cys 的双重荧光检测。© 2021 工业化学学会。
更新日期：2021-05-21
中文翻译：
含噻吩苯并咪唑的聚（咔唑-alt-芴）π-共轭聚合物：金属离子和半胱氨酸的合成、表征和荧光识别
合成并表征了一种含有 2-(噻吩-2-基)-1H-苯并[d] 咪唑单元的新型共轭聚合物 PFCZ-IM。研究了聚合物的基本光物理性质及其对金属离子和氨基酸的荧光识别行为。在金属离子响应的研究中，PFCZ-IM对Fe 3+、Ag +和Cu 2+具有较高的灵敏度，显着淬灭了聚合物的荧光。通过密度泛函理论计算研究了 2-(噻吩-2-基)-1H-苯并[d]咪唑部分与 Cu 2+ 的结合。有趣的是，[PFCZ-IM-Cu 2+] 在半胱氨酸 (Cys) 存在下，由于 Cu 2+和 Cys之间的相互作用导致聚合物从复合物中解离，因此还表现出荧光“开启”的突出特性。特别是加入30 μmol L –1的Cys 可使PFCZ-IM的Cu 2+猝灭荧光提高34.8 倍，响应时间短，表明[PFCZ-IM-Cu 2+ ] 在实际应用中具有巨大的潜力。 Cys的检测。该聚合物有望用于特定金属离子和 Cys 的双重荧光检测。© 2021 工业化学学会。
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