Dissociation and charge transport in salts of dendronized ions in solvents of low polarity
| Autor: | George Floudas, Hans-Jürgen Butt, David Türp, Klaus Müllen, Manfred Wagner, Konstantinos Mpoukouvalas |
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| Rok vydání: | 2011 |
| Předmět: |
Anions
liquids Dendrimers Magnetic Resonance Spectroscopy Inorganic chemistry Static Electricity electrolytes Dissociation (chemistry) Ion chemistry.chemical_compound Materials Chemistry Physical and Theoretical Chemistry Furans Chloroform media Toluene stabilization Surfaces Coatings and Films Quaternary Ammonium Compounds Ion dissociation chemistry constant Dielectric Spectroscopy Solvents activation Salts conductivity anions |
| Zdroj: | The journal of physical chemistry. B. 115(19) |
| ISSN: | 1520-5207 |
| Popis: | The ion dissociation and transport properties of a series of tetrabutylammonium salts (TBA(+)) of rigidly dendronized anions with various sizes have been investigated in toluene, THF, and chloroform for a range of concentrations with dielectric spectroscopy and diffusion ordered spectroscopy (DOSY)-NMR This is one of the first cases that one can study salts in low polarity solvents. The new synthetic approach increases the solubility and allows for investigation of both steric hindrance as well as electronic effects in producing weakly coordinating anions. We found that steric effects promote ion dissociation. In addition, fluorine substitution in the dendritic corona screens the electrostatic interactions and leads to increased dissociation. From the degree of dissociation and the measured diffusion coefficients, the free anion and cation diffusion coefficients were extracted and compared for the different dendrimer generations. Journal of Physical Chemistry B |
| Databáze: | OpenAIRE |
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