Ultrafast Excited State Dynamics of Biliverdin Dimethyl Ester Coordinate with Zinc Ions  

作　　者：Zhuang Chen Yang-yi Liu Xiao-xiao He Jin-quan Chen 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Journal of Chemical Physics》2020年第1期69-74,I0030-I0033,共10页化学物理学报（英文）

基　　金：the National Nature Science Foundation of China(No.11674101,No.21873030 and No.91850202)。

摘　　要：As one of the biological endogenous pigments,biliverdin(BV)and its dimethyl ester(BVE)have extremely weak uorescence in solution with quantum yield less than 0.01%.However,the situation reverses with the addition of zinc ions.The strength for uorescence of BVE-Zn^2+ complex is greatly enhanced and uorescence quantum yield can increase to5%.Herein,we studied ultrafast excited state dynamics of BVE-Zn^2+ complex in ethanol,npropanol,and DMSO solutions in order to reveal the mechanism of uorescence quantum yield enhancement.The results show that BVE can form a stable coordination complex with zinc with 1:1 stoichiometry in solution.BVE is structurally and energetically more stable in the complex.Using picosecond time-resolve uorescence and femtosecond transient absorption spectroscopy,we show that smaller non-radiative rate constant of BVE-Zn^2+ complex in DMSO is the key to increasing its uorescence quantum yield and the excited state decay mechanism is also revealed.These results provide valuable information about the uorescence property change after BVE binding to metal ions and may provide a guidance for the study of phytochromes or other uorescence proteins in which BV/BVE acts as chromophores.

关 键 词：BILIVERDIN ZINC FLUORESCENCE Quantum yield Femtosecond transient absorption Excited state dynamics 

分 类 号：O641.4[理学—物理化学] O657.3[理学—化学]