title: Sonochemical degradation of cyclic nitroxides in aqueous solution.
abstract: The sonochemical degradation of eight five- and six-membered nitroxides has been studied by EPR spectroscopy after exposure to ultrasound at a frequency of 354 kHz in argon-saturated aqueous solution. Concentration vs. time profiles do not follow a simple rate law. Octanol/water partition functions have been determined for all eight nitroxides, and an excellent linear correlation has been found between initial decomposition rates and hydrophobicity (log K(octanol/water)). Variation of initial rate with concentration was investigated for one compound (TEMPONE) and is largely consistent with an equilibrium distribution of substrate between bulk solution and the gas/liquid interface.
authors.affiliation: Department of Chemistry, University of Rhode Island, Kingston, RI 02881, USA. Kirschenbaum@chm.uri.edu
authors.forename: Louis J
authors.initials: LJ
authors.lastname: Kirschenbaum
authors.forename: Peter
authors.initials: P
authors.lastname: Riesz
mesh_terms: D003497:Cyclic N-Oxides / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D012996:Solutions; D013010:Sonication / Q000295:instrumentation / Q000379:methods*; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003497:Cyclic N-Oxides; D012996:Solutions; D014867:Water