Infrared Spectra of (<i>Z</i>)- and (<i>E</i>)-<sup>•</sup>C<sub>2</sub>H<sub>3</sub>C(CH<sub>3</sub>)I Radicals Produced upon Photodissociation of (<i>Z</i>)- and (<i>E</i>)-(CH<sub>2</sub>I)HC═C(CH<sub>3</sub>)I in Solid <i>para-</i>Hydrogen
作者:Karolina Anna Haupa、Kuang-Po Chen、Yaw-Kuen Li、Yuan-Pern Lee
DOI:10.1021/acs.jpca.0c03987
日期:2020.7.16
(CH2I)HC═C(CH3)I, and O2, but the mechanism of its formation remains unexplored. We synthesized pure (Z)- and (E)-1,3-diiodo-but-2-ene and measured their distinct IR spectra. Upon irradiation at 280 nm of (Z)- and (E)-1,3-diiodo-but-2-ene in solid p-H2 at 3.3 K, the fission of the terminal C—I bond yields (Z)- and (E)-3-iodo-but-2-en-1-yl [•C2H3C(CH3)I] radicals, respectively. These radicals were characterized
异戊二烯的臭氧分解以产生Criegee中间体,例如甲基乙烯基酮氧化物(MVKO),C 2 H 3 C(CH 3)OO是大气化学中的重要过程。MVKO是在将1,3-二碘丁-2-烯,(CH 2 I)HC═C(CH 3)I和O 2的气态混合物光解后在实验室中生产和鉴定的,但其机理是形成仍未探索。我们合成了纯的(Z)-和(E)-1,3-二碘代丁-2-烯,并测量了它们独特的IR光谱。固体p -H 2中的(Z)-和(E)-1,3-二碘代丁-2-烯在280 nm处辐照在3.3 K时,末端C-I键的裂变产生(Z)-和(E)-3-碘-丁-2-烯-1-基[ • C 2 H 3 C(CH 3)I]基团, 分别。这些自由基的特征是在2962.4、1423.8、1265.3、1120.9 / 1127.0、921.4 / 922.3和792.5 / 791.7 cm –1处具有红外吸收谱线,并且对于(Z)- • C