Biotinylated Water-Soluble Conjugated Polymers：Synthesis and the Application in Biological Analysis

Liu, Xingfen; Cai, Xueting; Huang, Yanqin; Shi, Lin; Fan, Quli; Huang, Wei

doi:10.6023/a13121247

Cited by 2 publications

(1 citation statement)

References 12 publications

(12 reference statements)

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“…然而, 由于共轭聚合物共轭骨架的疏水性导致其在水中倾向于发生聚集, 从而降低溶解性, 引起荧光淬灭; 而且在固相中, 激子在链间传输相对自由, 导致其容易陷入低量子产率或淬灭位点的低能阱态 [9][10][11] , 阻碍了水溶性共轭聚合物的进一步应用. 相比于对共轭分子进行化学结构修饰来调控分子聚集行为, 如骨架引入位阻基团和侧链修饰等 [12][13][14][15][16][17] , 利用非键作用形式将特定分子与共轭聚合物复合来降低其主链间相互作用是一种较为简单, 成本低廉的方法 [18][19][20][21][22] . 其中, 使用两亲性的分子降低共轭聚合物分子的链间相互作用以及调控其构象从而降低淬灭效果是一种有效的策略 [23][24][25][26] .…”

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Regulating Optical Properties of Water-Soluble Conjugated Polythiophene with Polyvinyl Alcohol

Qi¹,

Gao²,

Zhu³

et al. 2022

Acta Chimica Sinica

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Water-soluble conjugated polymers have attracted enormous attention because of their water solubility and attractive optical properties. However, they often suffer from low emission quantum yield due to their strong inter-chain interaction and concomitant exciton quenching, especially in the solid state. To enhance the emission of the water-soluble conjugated polymers, strategies of decreasing the aggregation tendency of the polymers and controlling the backbone conformations are often adopted. In this work, to solve the problem of aggregation-caused quenching of luminescent conjugated polymer dilute solution during drying, we regulate the aggregation behavior and backbone conformation of a water-soluble conjugated polythiophene (PMNT) with polyvinyl alcohol (PVA) by intermolecular interactions, e.g. hydrogen bonding, and obtained tunable emissive PMNT thin films. Specifically, when PMNT in solution state is blended with PVA, obvious red shift of absorption and emission maxima and higher fluorescence intensity are observed, indicating that PVA molecules isolate the PMNT chains, reduce the degree of chain flexibility and increase backbone rigidity. Furthermore, by varying dry methods, we obtained PMNT solid films of tunable light absorption/emission properties: the solid films fabricated through splat cooling and in-situ lyophilization preserve the optical properties of the mixed solution of PVA and PMNT; the films fabricated through heat drying exhibit the similar optical properties with those of PMNT solution without adding PVA. Moreover, the emission quantum yield of the solid film prepared by the lyophilization method was enhanced compared with that of the solid film prepared by heat drying. These results suggest that the aggregation/conformation regulations of PMNT solution by PVA are retained in different degrees dependent on the drying methods: heat drying only maintains the isolation effect of PVA on PMNT; lyophilization readily preserve the interactions between PVA and PMNT, locking their disperse states and conformations. This study provides a strategy for regulating the aggregation behaviors and optical properties of solid conjugated polymers from the perspective of drying method.

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