Effect of alkali ions on optical properties of flavins: vibronic spectra of cryogenic M+lumichrome ions (M = Li-Cs) in the gas phase.

Effect of alkali ions on optical properties of flavins: vibronic spectra of cryogenic M+lumichrome ions (M = Li-Cs) in the gas phase.
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碱离子对黄素光学性质的影响:气相中低温 M 发光铬离子 (M = Li-Cs) 的振动光谱

DOI:
10.1039/c8cp03950j
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发表时间:
2018
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
O. Dopfer
O. Dopfer
中科院分区:
--
文献类型:
--
作者:
P. Nieto;D. Müller;A. Sheldrick;A. Günther;M. Miyazaki;O. Dopfer

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黄素的光化学性质敏感地依赖于它们的环境,并且通过与金属离子的配位而强烈地改变。本文中,最小的黄素分子(发光色素,LC,C12 N4 O2 H10)与碱离子(M+LC,M = Li-Cs)的冷复合物的电子光谱通过在与串联质谱仪和电喷雾电离源耦合的低温离子阱中在可见光范围内(VISPD)的光解离来测量。通过与PBE 0/cc-pVDZ水平上的量子化学计算和多维Franck-Condon模拟的比较,将所有离子的振动光谱归属于M+LC中最稳定的O 4异构体的光学明亮的S1 ← S 0(ππ*)跃迁。丰富的电子振动光谱表明大量的几何形状的变化后,S1激发。大的红移的S1起源后金属络合和进展的分子间平面内金属拉伸和弯曲模式表明,在M+LC(O 4)的金属黄素相互作用的强度强烈增加S1激发。在M+LC(O 4)的S1态中,较强的M+ NLC键通过LC发色团的ππ* 激发后的电荷重组而合理化。计算证实,LC的光学性质可以强烈调制通过金属化通过类型和结合位点的金属离子。
The photochemical properties of flavins depend sensitively on their environment and are strongly modified by coordination with metal ions. Herein, the electronic spectra of cold complexes of the smallest flavin molecule (lumichrome, LC, C12N4O2H10) with alkali ions (M+LC, M = Li–Cs) are measured by photodissociation in the visible range (VISPD) in a cryogenic ion trap coupled to a tandem mass spectrometer and an electrospray ionization source. The observed vibronic spectra of all ions are assigned to the optically bright S1 ← S0 (ππ*) transition of the most stable O4 isomer of M+LC by comparison with quantum chemical calculations at the PBE0/cc-pVDZ level coupled to multidimensional Franck–Condon simulations. The rich vibronic spectra indicate substantial geometry changes upon S1 excitation. Large red shifts of the S1 origins upon metal complexation and progressions in the intermolecular in-plane metal stretch and bend modes demonstrate that the strength of the metal–flavin interaction in M+LC(O4) strongly increases by S1 excitation. The stronger M+⋯LC bond in the S1 state of M+LC(O4) is rationalized by the charge reorganization upon ππ* excitation of the LC chromophore. The computations confirm that the optical properties of LC can be strongly modulated by metalation via both the type and binding site of the metal ion.
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