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首页> 外文期刊>Coordination chemistry reviews >Protonation equilibria of transition metal complexes: From model systems toward the Mn-complex in photosystem II
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Protonation equilibria of transition metal complexes: From model systems toward the Mn-complex in photosystem II

机译:过渡金属配合物的质子平衡:从模型系统到光系统II中的锰配合物

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We report state-of-the-art pK(A) computations of manganese model systems. The employed methods can be used to perform pK(A) computations on the oxygen evolving Mn4CaO5 cluster (OEC) in photosystem II (PSII). These computations are very useful for understanding the function of molecular machines and nano-structures considered for artificial photosynthesis. We first summarize the activities going on in natural and artificial photosynthesis. Next, it is outlined how OEC and manganese model structures can vary with different protonation and oxidation states. We also discuss the role of the dielectric constant of proteins in electrostatic energy computations. Then the results obtained so far on pK(A) computations of the OEC are summarized. Subsequently, we outline the theoretical background behind performing ab initio pK(A) value computations. In the application part, we first consider pK(A) computations for the simple hexa-aqua manganese complex. There it is discussed in detail how computed pK(A) values depend on atomic radii, charges and the electron leakage effect. A presentation of results follows including a critical discussion of the computed pK(A) values of di-manganese model complexes. Possible reasons for deviations from measured pK(A) values and techniques for improvement are discussed and summarized in a final section. (C) 2017 Elsevier B.V. All rights reserved.
机译:我们报告了锰模型系统的最新pK(A)计算。所采用的方法可用于对光系统II(PSII)中的放氧Mn4CaO5团簇(OEC)进行pK(A)计算。这些计算对于理解用于人工光合作用的分子机器和纳米结构的功能非常有用。我们首先总结自然和人工光合作用中正在进行的活动。接下来,概述了OEC和锰模型结构如何随不同的质子化和氧化态而变化。我们还将讨论蛋白质介电常数在静电能计算中的作用。然后总结了到目前为止在OEC的pK(A)计算中获得的结果。随后,我们概述了执行从头算pK(A)值计算的理论背景。在应用部分,我们首先考虑简单六水锰配合物的pK(A)计算。在此详细讨论了计算出的pK(A)值如何取决于原子半径,电荷和电子泄漏效应。结果介绍如下,其中包括对二锰模型配合物的pK(A)值的严格讨论。最后一节讨论并总结了与测量的pK(A)值偏离的可能原因以及改进技术。 (C)2017 Elsevier B.V.保留所有权利。

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