物理化学学报 >> 2002, Vol. 18 >> Issue (07): 640-643.doi: 10.3866/PKU.WHXB20020715

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双链DNA分子内电荷转移超交换机理

徐四川;艾希成;冯娟;张汝波;张启元;张兴康   

  1. 中国科学院化学研究所分子科学中心,分子动态与稳态结构国家重点实验室,北京 100080
  • 收稿日期:2001-11-20 修回日期:2001-12-31 发布日期:2002-07-15
  • 通讯作者: 徐四川 E-mail:xusc@chem.pku.edu.cn

Superexchange Mechanism of Charge Transfer in Supermolecular Assemblies

Xu Si-Chuan;Ai Xi-Cheng;Feng Juan;Zhang Ru-Bo;Zhang Qi-Yuan;Zhang Xing-Kang   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Molecular Science Center,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080
  • Received:2001-11-20 Revised:2001-12-31 Published:2002-07-15
  • Contact: Xu Si-Chuan E-mail:xusc@chem.pku.edu.cn

摘要: 设计并合成了一系列寡聚核苷酸组成的双链DNA分子,通过检测样品中二氨基嘌呤(Ap)荧光峰强度和相对荧光量子产率来研究DNA分子内电荷转移.实验中直接分辨和观测到双链DNA分子内电荷转移超交换机理,超交换机理在近距离起作用;而电荷转移跳跃机理,可能是通过极子运动形式体现.

关键词: DNA, 二氨基嘌呤(Ap), 超交换机理, 跳跃机理

Abstract: The investigation on charge migration mechanism in double helix DNA is an important current issue extensively studied in the overlapping field of chemistry and biology.We have designed and synthesized a series of supermolecular assemblies of double helix DNA to study charge migration mechanism in DNA by measuring Ap fluorescence and its relative fluorescence quantum yield.Experimentaly,we have distinguished and observed superexchange mechanism of charge transfer in the supermolecular assemblies of double helix DNA,which plays a role in DNA for short distance; but hopping mechanism may be exhibited by the phonon-assisted polaron-like hopping migration.

Key words: DNA, Ap, Superexchange mechanism, Hopping mechanism