This work reports the designed synthesis and characterization of nine tetranuclear mixed valence cyanido-bridged complexes [CpMe_n(dppe)Fe^IICNRu₂^III,III(X-DMBA)₄NCFe^II(dppe)CpMe_n][PF₆]₂ (1–9: CpMe_n=polymethylcyclopentadienyl, n=0, 4, 5; DMBA=N,N’-dimethylbenzamidinate, X= H, MeO, CF₃). The regular variation of crystallographic data, IR and UV/Vis/NIR spectra for complexes 1–9 demonstrates that the substitution effect of the ligand at the donor or acceptor fragment has explicit influence on the MMCT properties. Moreover, the electrochemical measurement might suggest the existence of long-range electronic coupling between the two terminal Fe^II in this Fe^II−CN−Ru₂^III,III−NC−Fe^II array.

中文翻译：

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取代效应对混合价氰基桥联FeII-CN-Ru2III,III-NC-FeII体系中MMCT的影响

这项工作报告了九个四核混合价氰桥络合物 [CpMe _n (dppe)Fe ^II CNRu ₂ ^III,III (X-DMBA) ₄ NCFe ^II (dppe)CpMe _n ][PF ₆ ] ₂ ( 1 – 9：CpMe _n = 聚甲基环戊二烯基，n = 0、4、5 ；DMBA = N,N'-二甲基苯甲脒，X = H、MeO、CF ₃ )。配合物1 – 9的晶体学数据、IR 和 UV/Vis/NIR 光谱的规律变化表明配体在供体或受体片段上的取代效应对 MMCT 特性有显着影响。此外，电化学测量可能表明该 Fe ^II -CN-Ru ₂ ^III,III -NC-Fe ^II阵列中两个末端 Fe ^II之间存在长程电子耦合。