title: Dissociation and charge transport in salts of dendronized ions in solvents of low polarity.
abstract: 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.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Mpoukouvalas
authors.forename: David
authors.initials: D
authors.lastname: Türp
authors.forename: Manfred
authors.initials: M
authors.lastname: Wagner
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt
authors.forename: George
authors.initials: G
authors.lastname: Floudas
mesh_terms: D000838:Anions / Q000737:chemistry; D002725:Chloroform / Q000737:chemistry; D050091:Dendrimers / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D005663:Furans / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D012997:Solvents / Q000737:chemistry*; D055672:Static Electricity; D014050:Toluene / Q000737:chemistry
chemical_list: D000838:Anions; D050091:Dendrimers; D005663:Furans; D000644:Quaternary Ammonium Compounds; D012492:Salts; D012997:Solvents; D014050:Toluene; C018674:tetrahydrofuran; D002725:Chloroform; C009405:tetrabutylammonium