The interplay of nanoconfinement and pH from the perspective of a dye‐reporter molecule
- 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.
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| Author: | Robert Brilmayer, Martin Brodrecht, Christoph Kaiser, Hergen Breitzke, Bharti Kumari, Josef WachtveitlORCiDGND, Gerd Buntkowsky, Annette Andrieu‐Brunsen |
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| URN: | urn:nbn:de:hebis:30:3-565042 |
| DOI: | https://doi.org/10.1002/cnma.202000423 |
| ISSN: | 2199-692X |
| Parent Title (German): | ChemNanoMat |
| Publisher: | Wiley |
| Place of publication: | Weinheim |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2020/09/25 |
| Date of first Publication: | 2020/09/25 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Release Date: | 2020/12/05 |
| Tag: | fluorescence dye; mesopore; ratiometric; silica; solid-state NMR |
| Volume: | 6 |
| Issue: | 12 |
| Page Number: | 11 |
| First Page: | 1843 |
| Last Page: | 1853 |
| HeBIS-PPN: | 47686951X |
| Institutes: | Biochemie, Chemie und Pharmazie / Biochemie und Chemie |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
| Sammlungen: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung-Nicht kommerziell - Keine Bearbeitung 4.0 |
