Subsite-Specific Reactions of a Cyclotriveratrylene [4Fe-4S] Cluster Complex
CHEMISCHE BERICHTE-RECUEIL(1997)
摘要
Ligand exchange reactions are carried out exclusively at the unique iron site of a subsite-differentiated cyclotriveratrylene [4Fe-4S] cluster complex. The effect of a variety of thiolate, phenolate, bidentate, and bridging ligands on the redox potential of the subsite-differentiated [4Fe-4S] cluster complex is studied and compared with the effects of such ligands on an [Fe4S4Cl4](2-) cluster. The redox potential can be modulated within the range of -1.60 to -1.80 V (vs. Fc(0/+)) by varying the ligand. The introduction of an electron releasing substituent shifts the redox potential to more negative values, whereas an electron withdrawing substituent has the opposite effect. A linear relationship exists between the number of substituted sites and the reduction potential of the cluster.
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关键词
iron-sulfur clusters,S ligands,cyclotriveratrylene,subsite-specific reactions,electrochemistry
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