Abstract:

Six model compounds have been synthesized and used for probing the structural features of the Mn cluster in oxygen-evolving complex (OEC) of photosystem Ⅱ (PSⅡ). The model compounds contain Mn2(μ-O) 2 and μ-O-μ-carboxylato di-manganese structural units, which offer Mn—Mn, Mn……Mn, and Mn—O(N) structural parameters consistent with the corresponding data of the OEC in PSⅡ, implying that the Mn cluster in OEC may possess similar structural features. Two model compounds containing halide anion have been used for discussing the binding of Cl- to Mn in PSⅡ. It is suggested that in the five S states, ligand exchange would lead to the ligation of chloride to Mn in the S states with Mn of higher valence.

PSII系统放氧复合物中的锰簇模型物
陈昌能 朱红平 黄德光 刘秋田*

（中国科学院福建物质结构研究所结构化学国家重点实验室，福州350002）

摘要：合成了6个模型化合物并用以探讨PSⅡ的放氧复合物(OEC)中Mn簇的结构特征.模型物包含Mn2(μ-O)2和μ-O-μ-羧桥联的二锰结构单元,这些单元中的Mn-Mn、Mn……Mn和Mn-O(N)结构参数与PSⅡ系统OEC的相应数据一致,暗示OEC中Mn簇可能具有类似的结构特点.还有两个模型物包含了卤素阴离子,它们被用于讨论PSⅡ中Cl-与Mn的联系.讨论认为,在5个PSⅡ的S态中,具有高价锰中心的S态较之其他S态更有可能因为配体交换而导致Cl-与Mn的配位

关键词： 光合系统；放氧复合物；模型物；锰簇合物

Key words: photosystem, oxygen-evolving complex, model compound, manganese cluster