吸附于大气颗粒物模型中的苝光化学主要产物。
MAJOR PRODUCTS IN THE PHOTOCHEMISTRY OF PERYLENE ADSORBED IN MODELS OF ATMOSPHERIC PARTICULATE MATTER.
作者信息
Sotero Pura, Arce Rafael
机构信息
Department of Chemistry, University of Puerto Rico, Río Piedras Campus P.O. Box 23346, San Juan, 00931-3346, Puerto Rico.
出版信息
J Photochem Photobiol A Chem. 2008 Sep 5;199(1):14-22. doi: 10.1016/j.jphotochem.2008.04.011.
The photodegradation of adsorbed perylene is strongly influenced by the environment in which it is found as demonstrated by the nature of the photoproducts characterized on the adsorbed state in comparison to its photochemical behavior in solution. The separation, characterization, and identification of the products were carried out using HPLC equipped with UV-Vis diode array and MS detection. Two of the products were identified as 1,12-perylenedione and 3,10-perylenedione. Three additional products were characterized as a perylenedione and two perylenediols based on their m/z ratio. Based on this information, two possible mechanisms of formation were proposed for the identified diones. The experimental data showed that both the radical cation and singlet oxygen participate in the route of photodegradation of perylene which occurs through a mixed Type I and Type II pathway. These results assist in the understanding of complex processes undergone by perylene and other PAHs in the environment.
与溶液中的光化学行为相比，吸附态苝的光降解受到其所处环境的强烈影响，这一点可从吸附态光产物的性质得到证明。使用配备紫外可见二极管阵列和质谱检测的高效液相色谱仪对产物进行分离、表征和鉴定。其中两种产物被鉴定为1,12-苝醌和3,10-苝醌。另外三种产物根据其质荷比被表征为一种苝醌和两种苝二醇。基于这些信息，针对已鉴定的醌提出了两种可能的形成机制。实验数据表明，自由基阳离子和单线态氧均参与了通过I型和II型混合途径发生的苝光降解过程。这些结果有助于理解苝和环境中其他多环芳烃所经历的复杂过程。
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