高等学校化学学报

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (12): 2757.doi: 10.7503/cjcu20120153

• 物理化学 • 上一篇    下一篇

萤火虫氧化荧光素类似物电子光谱的理论研究

李作盛, 邹陆一, 任爱民, 封继康   

  1. 吉林大学理论化学研究所, 理论化学计算国家重点实验室, 长春 130021
  • 收稿日期:2012-02-23 出版日期:2012-12-10 发布日期:2012-11-20
  • 通讯作者: 任爱民,女,博士,教授,博士生导师,主要从事量子化学计算研究.E-mail:aimin_ren@yahoo.com E-mail:aimin_ren@yahoo.com
  • 基金资助:

    国家自然科学基金(批准号: 20973078, 20673045, 21173099)及留学回国人员科研启动基金资助.

Theoretical Study of the Electronic Spectral Property of Firefly Oxyluciferin Analogues

LI Zuo-Sheng, ZOU Lu-Yi, REN Ai-Min, FENG Ji-Kang   

  1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130021, China
  • Received:2012-02-23 Online:2012-12-10 Published:2012-11-20

PDF (PC)

被引次数

11

摘要：

对萤火虫氧化荧光素(S)-2-(6-羟基-2-苯并噻唑基)-2-噻唑啉-4-酮(BTZ)中苯并噻唑环的N和S原子进行取代, 形成一系列萤火虫氧化荧光素类似物, 并采用TD B3LYP/6-31+G(d)方法, 通过计算氧化物中性态与羟基去质子化后的负一价态在气相、水溶液和模拟生物环境下的吸收与发射光谱, 讨论环内不同取代原子对光谱的影响. 结果表明, X1位以O原子取代S原子的化合物的最大吸收值发生蓝移, 以N原子取代S原子的化合物的最大吸收值发生红移. 去质子化可增加苯环上π轨道成份, 降低能隙, 从而有利于提高电子跃迁几率, 使荧光发射波长红移; 通过取代X1和X2位杂原子, 可调节发射光谱红移达44 nm, 蓝移达41 nm(在模拟蛋白中). 6种化合物荧光发光范围较宽, 振子强度较大, 可以作为潜在的化学发光材料用于生物成像研究.

关键词: 萤火虫氧化荧光素类似物, 光谱性质, 密度泛函理论

Abstract:

A series of firefly oxyluciferin analogues were designed, in which the N and S atoms of benzothiazole of firefly oxyluciferin were substituted by other atoms. In aqueous solution and virtual protein environment, the absorption and emission spectrum were calculated by TD B3LYP/6-31+G(d). The results of the calculation indicate that the absorption spectra of complexes with the O atom at X1-site show more blue-shift than that with the S atom, while the spectra of complexes in which the S atom is replaced by the N atom show red-shift. The six complexes have similar orbital distributions and the overlapping volume between HOMO and LUMO is high. That benefits to the maintain of high fluorescence efficiency. Deprotonation can enhance the π orbital component of benzene fragment and make emission spectra shift to red. Thus electronic transition probability can be improved. Replaced by different atoms at X1 and X2 sites, the emission spectra can be adjusted to move to long wave up to 44 nm and move to short wave up to 41 nm(in virtual protein environment). The emission wavelength range of the six complexes is wide. So they can be used in biological imaging as new potential chemical luminescent material.

Key words: Firefly oxyluciferin analogue, Spectrum property, Density functional theory

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