The Interplay of Nanoconfinement and pH from the Perspective of a Dye‐Reporter Molecule,ChemNanoMat

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The Interplay of Nanoconfinement and pH from the Perspective of a Dye‐Reporter Molecule
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-09-25 , DOI: 10.1002/cnma.202000423
Robert Brilmayer ₁ , Martin Brodrecht ₂ , Christoph Kaiser ₃ , Hergen Breitzke ₂ , Bharti Kumari ₁ , Josef Wachtveitl ₄ , Gerd Buntkowsky ₂ , Annette Andrieu-Brunsen ₅

Affiliation

A novel thiazol‐based ratiometric dye for the detection of local pH values is synthesized, and its properties are characterized by a combination of optical spectroscopy, solid‐state NMR and DNP (dynamic nuclear polarization)‐enhanced solid‐state NMR. This novel dye covers a completely different sensitivity range with its acidic pKa value of 3.5 compared to other established dyes for ratiometric pH detection, such as SNARF. The dye is grafted to the surfaces of mesoporous silica materials, which enables, for the first time, direct in situ measurements of the local pH values in silica mesopores by a simple UV‐vis spectroscopy method. The obtained results, which are in good agreement with previous indirect techniques, indicate a background electrolyte‐dependent pKa shift of at least one pH unit under nanoconfined conditions compared to the pKa of the dye in bulk solution.

中文翻译：

染料记者分子视角下纳米约束与pH的相互作用

合成了一种新型的基于噻唑的比例染料，用于检测局部pH值，其特性通过结合光谱，固态NMR和DNP（动态核极化）增强的固态NMR来表征。与其他用于比例pH检测的成熟染料（例如SNARF）相比，该新型染料的酸性pKa值为3.5，涵盖了完全不同的灵敏度范围。该染料被接枝到介孔二氧化硅材料的表面，这使得首次能够通过简单的紫外可见光谱法直接对二氧化硅介孔中的局部pH值进行直接测量。获得的结果与以前的间接技术非常吻合，

更新日期：2020-09-25

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