Local viscosity and solvent relaxation experienced by rod-like fluorophores in AOT/4-chlorophenol/m-xylene organogels
| Autor: | Debabrata Mandal, Manika Dandapat |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Relaxation (NMR)
02 engineering and technology Trapping 010402 general chemistry 021001 nanoscience & nanotechnology m-Xylene 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Analytical Chemistry Microviscosity Solvent chemistry.chemical_compound Viscosity chemistry Chemical physics Organic chemistry Molecule 4-chlorophenol 0210 nano-technology Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 170:150-156 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2016.07.012 |
| Popis: | Organogels prepared from AOT/4-chlorophenol/m-xylene are immobile in the macroscopic sense, with a well-characterized internal structure. However, the molecular level dynamics inside the gels is not too clear, although a very slow structural relaxation has been reported previously. Using a set of rod-like fluorophores, we find that the rotational mobility of a small guest molecule inside the gel can be extremely fast, indicating presence of sufficiently low-microviscosity domains. These domains consist of m-xylene solvent molecules trapped in the interstices of fiber bundles comprising columnar stacks of 4-chlorophenol surrounded by AOT molecules. However, interstitial trapping of m-xylene does retard its own dynamics, which explains the slow solvent relaxation inside the gels. Hence, the state of m-xylene in the organogel may be characterized as "bound", in contrast to the "free" state in neat m-xylene. |
| Databáze: | OpenAIRE |
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