研究目的
Investigating the unique negative solvatochromic emission (NSE) process from a conformational change of a coordination cage in response to solvent composition.
研究成果
The study demonstrates that with two closely placed planar fluorophores in a single macromolecular cage, an unusual negative solvatochromic emission (NSE) effect due to conformational change based on intramolecular hydrophobic interaction and p–p stacking can be observed. This effect is supported by fluorescence, UV-vis absorption, and small angle X-ray scattering. The cages could be used as indicators for non-covalent interactions in solution and as sensors for changes in solvent quality and/or ionic strength.
研究不足
The study is limited to the specific cages synthesized and may not be generalizable to other systems. The exact mechanism of the intramolecular interactions leading to the NSE effect requires further investigation.
1：Experimental Design and Method Selection:
The study involved synthesizing a Pt-cage (Cage 1) with two tetra-(4-pyridylphenyl)ethylene (TPPE) luminogens and comparing it with a larger cage (Cage 2) with a longer distance between the two TPPE ligands. The cages were characterized by 1H-NMR, 31P-NMR, 2D DOSY NMR, and small angle X-ray scattering (SAXS) measurements.
2：Sample Selection and Data Sources:
Cage 1 and Cage 2 were synthesized and dissolved in various solvents to study their fluorescence properties.
3：List of Experimental Equipment and Materials:
The study used NMR spectroscopy, SAXS, and fluorescence spectroscopy.
4：Experimental Procedures and Operational Workflow:
The cages were dissolved in different solvents, and their fluorescence properties were measured as the solvent composition changed.
5：Data Analysis Methods:
The data were analyzed to understand the conformational changes and the resulting fluorescence properties.
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