Reaction between diiodide anion radicals in ionic liquids.
Photodetachment of electrons from iodide ions produced diiodide anion radicals in ionic liquids containing ammonium, pyrrolidinium, and piperidinium cations. The rates of reaction between diiodide anion radicals in molecular solvents such as H2O, methanol, and ethanol could be estimated by the Debye-Smoluchowski equation, which accounts for electrostatic interactions using dielectric constants for the molecular solvents. In contrast, the rates of reaction between diiodide anion radicals in the ionic liquids were close to the diffusion-limited rates for the neutral molecules, suggesting that electrostatic repulsion between the diiodide anion radicals is weakened by Coulombic shielding in the ionic liquids.
Takahashi
Kenji
K
Division of Material Science, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan. ktkenji@t.kanazawa-u.ac.jp
Sakai
Shingo
S
Tezuka
Hiroaki
H
Hiejima
Yusuke
Y
Katsumura
Yosuke
Y
Watanabe
Masayoshi
M
D000838:Anions / Q000737:chemistry / Q000528:radiation effects; D002412:Cations / Q000737:chemistry; D004583:Electrons; D000431:Ethanol / Q000737:chemistry; D005609:Free Radicals / Q000737:chemistry / Q000528:radiation effects; D007454:Iodides / Q000737:chemistry* / Q000528:radiation effects; D052578:Ionic Liquids / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D010880:Piperidines / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D055672:Static Electricity; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000838:Anions; D002412:Cations; D005609:Free Radicals; D007454:Iodides; D052578:Ionic Liquids; D010880:Piperidines; D011758:Pyrroles; D000644:Quaternary Ammonium Compounds; D014867:Water; D000431:Ethanol; D000432:Methanol