首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Deactivation of O_2(~1Δ_g) Singlet Oxygen by Carotenoids: Internal Conversion of Excited Encounter Complexes
【24h】

Deactivation of O_2(~1Δ_g) Singlet Oxygen by Carotenoids: Internal Conversion of Excited Encounter Complexes

机译:类胡萝卜素使O_2(〜1Δ_g)单重态氧失活:激发相遇复合物的内部转化

获取原文
获取原文并翻译 | 示例
           

摘要

Literature data of rate constants kQ of electronic energy transfer (EET) from O_2(~1Δ_g) singlet oxygen to 28 carotenoids have been analyzed by means of a semiempirical model derived for the deactivation of triplet excited (T_1) molecules by O_2(~3Σ_g~-) triplet ground-state oxygen. The analysis demonstrates that EET from O_2(~1Δ_g) to carotenoids occurs not via the electron exchange mechanism according to Dexter but principally via formation of ~1(~1Δ·S_0) encounter complexes that deactivate irreversibly by internal conversion to ~1(T_1·~3Σ) encounter complexes leading to formation of the T1 excited carotenoid. The dependence of log(k_Δ~Q) on the excess energy of the EET process is quantitatively described. The results indicate that EET processes to and from O_2 could generally occur via IC of excited complexes.
机译:利用半经验模型分析了从O_2(〜1Δ_g)单态氧到28个类胡萝卜素的电子能量传输(EET)的速率常数kQ的文献数据,该模型通过O_2(〜3Σ_g〜)使三重态激发(T_1)分子失活。 -)三重态基态氧。分析表明,从O_2(〜1Δ_g)到类胡萝卜素的EET不是通过Dexter的电子交换机制发生的,而是主要通过形成〜1(〜1Δ·S_0)遇到的复合物,这些复合物通过内部转化为〜1(T_1· 〜3Σ)遇到复合物,导致形成T1激发的类胡萝卜素。 log(k_Δ〜Q)对EET过程的多余能量的依赖性得到了定量描述。结果表明,通常通过受激配合物的IC发生往返于O_2的EET过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号