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Dithiane Based Boronic Acid as a Carbohydrate Sensor in an Aqueous Solution at pH 7.5: Theoretical and Experimental Approach
Journal of Fluorescence ( IF 2.7 ) Pub Date : 2021-08-21 , DOI: 10.1007/s10895-021-02791-4
Bhavya Nelligere Revanna 1 , Mahendra Madegowda 1
Affiliation  

Carbohydrate sensing in an aqueous solution remains a very challenging area of interest. Using the idea of covalent reversible interaction between boronic acids and the diol groups in carbohydrates enable us to design a carbohydrate sensor 1-thianthrenylboronic acid (1T), which has high selectivity towards fructose. To elucidate the sensing and binding properties of 1T with sugars, we have incorporated theoretical (DFT and TD-DFT) and spectroscopic techniques. For an optimized geometry, the complete vibrational assignments were done with FT-IR and FT-Raman spectra. Physiochemical parameters were obtained by implementing frontier molecular orbital (FMO) analysis. Further, excited state properties were determined by performing TD-DFT calculations in solvent and these properties were in good agreement with the experiment. The steady state fluorescence measurements with varying concentration of sugars, revealed that the fluorescence intensity of boronic acid is enhanced by studied sugars due to the structural modification. We also noticed remarkable changes in fluorescence lifetimes and quantum yield after adding sugars. The article also reports influence of pH on boronic acid’s fluorescence intensity with and without sugars. The fluorescence of boronic acid increases with the increase in pH. These changes are due to acid–base equilibrium of boronic acid and led us to estimate the pKa value of 7.6. All the theoretical and experimental evidences suggested that 1T can be used as a possible fluorescent sensor for fructose. In addition, 1T showed very good affinity for Cu2+ ion with Ka = 150 × 102 M−1, which suggests that 1T can also be used as a chemosensor for Cu2+ ions.



中文翻译:

基于二噻烷的硼酸作为 pH 7.5 水溶液中的碳水化合物传感器:理论和实验方法

水溶液中的碳水化合物传感仍然是一个非常具有挑战性的兴趣领域。利用硼酸与碳水化合物中二醇基团之间共价可逆相互作用的想法,我们能够设计出一种碳水化合物传感器 1-噻吩基硼酸 (1T),它对果糖具有高选择性。为了阐明 1T 与糖的传感和结合特性,我们结合了理论(DFT 和 TD-DFT)和光谱技术。对于优化的几何形状,完整的振动分配是用 FT-IR 和 FT-Raman 光谱完成的。通过实施前沿分子轨道 (FMO) 分析获得理化参数。此外,通过在溶剂中进行 TD-DFT 计算来确定激发态特性,这些特性与实验非常吻合。不同浓度糖的稳态荧光测量表明,硼酸的荧光强度因结构修饰而被所研究的糖增强。我们还注意到添加糖后荧光寿命和量子产率的显着变化。该文章还报告了 pH 值对含糖和不含糖的硼酸荧光强度的影响。硼酸的荧光随着pH的升高而增强。这些变化是由于硼酸的酸碱平衡引起的,并导致我们估计 pKa 值为 7.6。所有的理论和实验证据都表明 1T 可以用作果糖的可能荧光传感器。此外,1T 对 Cu 表现出非常好的亲和力 表明由于结构修饰,研究的糖增强了硼酸的荧光强度。我们还注意到添加糖后荧光寿命和量子产率的显着变化。该文章还报告了 pH 值对含糖和不含糖的硼酸荧光强度的影响。硼酸的荧光随着pH的升高而增强。这些变化是由于硼酸的酸碱平衡引起的,并导致我们估计 pKa 值为 7.6。所有的理论和实验证据都表明 1T 可以用作果糖的可能荧光传感器。此外,1T 对 Cu 表现出非常好的亲和力 表明由于结构修饰,研究的糖增强了硼酸的荧光强度。我们还注意到添加糖后荧光寿命和量子产率的显着变化。该文章还报告了 pH 值对含糖和不含糖的硼酸荧光强度的影响。硼酸的荧光随着pH的升高而增强。这些变化是由于硼酸的酸碱平衡引起的,并导致我们估计 pKa 值为 7.6。所有的理论和实验证据都表明 1T 可以用作果糖的可能荧光传感器。此外,1T 对 Cu 表现出非常好的亲和力 该文章还报告了 pH 值对含糖和不含糖的硼酸荧光强度的影响。硼酸的荧光随着pH的升高而增强。这些变化是由于硼酸的酸碱平衡引起的,并导致我们估计 pKa 值为 7.6。所有的理论和实验证据都表明 1T 可以用作果糖的可能荧光传感器。此外,1T 对 Cu 表现出非常好的亲和力 该文章还报告了 pH 值对含糖和不含糖的硼酸荧光强度的影响。硼酸的荧光随着pH的升高而增强。这些变化是由于硼酸的酸碱平衡引起的,并导致我们估计 pKa 值为 7.6。所有的理论和实验证据都表明 1T 可以用作果糖的可能荧光传感器。此外,1T 对 Cu 表现出非常好的亲和力2+离子,K a  = 150 × 10 2  M −1,这表明 1T 也可以用作 Cu 2+离子的化学传感器。

更新日期:2021-08-23
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