Toward Ab Initio Optical Spectroscopy of the Fenna-Matthews-Olson Complex.

Toward Ab Initio Optical Spectroscopy of the Fenna-Matthews-Olson Complex.
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Fenna-Matthews-Olson 复合体的从头算光谱学。

DOI:
10.1021/jz402000c
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发表时间:
2013
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Cole DJ
Cole DJ
中科院分区:
--
文献类型:
--
作者:
Cole DJ

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我们介绍了Fenna-Matthews-Olson色素-蛋白质复合体的哈密顿量的第一原理参数化的进展,该分子已成为理解量子动力学在光合作用激子能量转移中的作用的关键。为此,我们使用线性标度密度泛函理论对组成该络合物的七种细菌-叶绿素色素中的每一种进行了全量子力学计算,包括其相当大一部分蛋白质环境(超过2000个原子),该理论利用了最近在激发态计算方面的一项发展。计算了局域色素跃迁能和光学跃迁间的色素间耦合,与文献一致。模拟和实验光谱之间的比较指向了未来的工作,这可能有助于阐明这些纳米设备的重要设计原则。
We present progress toward a first-principles parametrization of the Hamiltonian of the Fenna–Matthews–Olson pigment–protein complex, a molecule that has become key to understanding the role of quantum dynamics in photosynthetic exciton energy transfer. To this end, we have performed fully quantum mechanical calculations on each of the seven bacteriochlorophyll pigments that make up the complex, including a significant proportion of their protein environment (more than 2000 atoms), using linear-scaling density functional theory exploiting a recent development for the computation of excited states. Local pigment transition energies and interpigment coupling between optical transitions have been calculated and are in good agreement with the literature consensus. Comparisons between simulated and experimental optical spectra point toward future work that may help to elucidate important design principles in these nanoscale devices.
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