Hydrogen Abstraction Reaction Of Benzophenone Research Articles

Study on the Translational Diffusion of Transient Species in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids by Transient Grating Spectroscopy

Abstract Translational diffusion coefficients of two transient species in 1-alkyl-3-methylimidazolium-based ionic liquids (Cnmim+) with different alkyl chain lengths (n = 4, 8, 12) and the bis(trifluoromethanesulfonyl)imide anion were measured by transient grating spectroscopy. The systems of interest are the benzophenone ketyl radical (BPK) produced by the hydrogen-abstraction reaction of benzophenone (BP) and the zwitterionic merocyanine dye (MC) produced by the photoisomerization of 1,3,3-trimethylindolino-6′-nitrobenzopyrylospiran (SP). The diffusion coefficients of BPK and MC closely obey the Stokes-Einstein (SE) relation in the ionic liquids regardless of the alkyl chain lengths of the cations, whereas the diffusion coefficients of BP are larger than those predicted by the SE equation. The temperature dependences of the translational diffusion coefficients of BP, BPK, and MC reveal that the diffusional activation energies of BPK and MC are larger than those of BP in all solvents. The origin of this difference is discussed in terms of intermolecular interactions within the ionic-liquid solvents.

The effects and mechanism of the magnetic field on the hydrogen abstraction reaction of benzophenone and isopropanol

The effects of magnetic fields ranging from 0 T to 0.13 T on the photochemical reactions between benzophenone and isopropanol in the complete reaction cycle were explored. The results showed that with the increase of the applied magnetic field strength, the production rate of the product benzopinacol increased, and the induction period of the reaction was shortened. A new theoretical model suitable for the excitation process was used to explain the magnetic phenomenon in the initiation process of radical reaction, in which the magnetic field was believed to change the lifetime distribution of the excited reactant BP*, thereby affecting the rate of product generation. Specific parameters were used to calculate the lifetime probability distribution of excited state reactant molecules, which provides support for the quantitative analysis of the magnetic field effects of the reaction.

Transient radical diffusion in photoinduced hydrogen abstraction reactions of benzophenone probed by the transient grating method

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransient radical diffusion in photoinduced hydrogen abstraction reactions of benzophenone probed by the transient grating methodMasahide Terazima, Koichi Okamoto, and Noboru HirotaCite this: J. Phys. Chem. 1993, 97, 50, 13387–13393Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https://doi.org/10.1021/j100152a052RIGHTS & PERMISSIONSArticle Views284Altmetric-Citations69LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (870 KB) Get e-Alerts