reaction of the phenyl radical 1 with water has been investigated by using matrixisolation spectroscopy and quantum chemical calculations. The primary thermal product of the reaction between 1 and water is a weakly bound complex stabilized by an OH⋅⋅⋅π interaction. This complex is photolabile, and visible‐light irradiation (λ>420 nm) results in hydrogen atom transfer from water to radical 1 and the formation
That's radical! A photochemical reaction between the phenylradical and water results in the abstraction of a hydrogen atom from water and the formation of a hydroxyl radical. The hydroxyl radical forms an OH⋅⋅⋅π hydrogen bond with benzene (see picture) and does not react with benzene thermally under the conditions of matrix isolation.
Matrix Isolation and Spectroscopic Characterization of the Phenylperoxy Radical and Its Rearranged Products
作者:Artur Mardyukov、Wolfram Sander
DOI:10.1002/chem.200801546
日期:2009.1.26
[H5]‐18O2‐1, and [D5]‐18O2‐1 were matrix‐isolated and characterized by IR spectroscopy. The experimental IR spectra are in excellent agreement with results from DFT calculations. Irradiation of 1 with visible light produces the 2‐oxepinoxy radical 5 in a clean reaction. Subsequent irradiation results in ring‐opening and formation of several conformers of ketoketene 6. The radicals 1, 5, and 6 play an important
AbstractDilute mixtures of C6H6 or C6D6 in He provide abundant [C6H6]+· or [C6D6]+· ions and small amounts of [C6H7]+ or [C6D7]+ ions as chemical ionization (CI) reagent ions. The C6H6 or C6D6 CI spectra of alkylbenzenes and alkylanilines contain predominantly M+· ions from reactions of [C6H6]+· or [C6D6]+· and small amounts of MH+ or MD+ ions from reactions of [C6H7]+ or [C6D7]+. Benzene CI spectra of aliphatic amines contain M+·, fragment ions and sample‐size‐dependent MH+ ions from sample ion‐sample molecules reactions. The C6D6 CI spectra of substituted pyridines contain M+· and MD+ ions in different ratios depending on the substituent (which alters the ionization energy of the substituted pyridine), as well as sample‐size‐dependent MH+ ions from sample ion‐sample molecule reactions. Two mechanisms are observed for the formation of MD+ ions: proton transfer from [C6D6]+· or charge transfer from [C6D6]+· to give M+·, followed by deuteron transfer from C6D6 to M+·. The mechanisms of reactions were established by ion cyclotron resonance (ICR) experiments. Proton transfer from [C6H6]+· or [C6D6]+· is rapid only for compounds for which proton transfer is exothermic and charge transfer is endothermic. For compounds for which both charge transfer and proton transfer are exothermic, charge transfer is the almost exclusive reaction.
Formation of deuterium and hydrogen atoms in the pyrolysis of benzene-d6 and chlorobenzene behind shock waves