Heterometallic triiron-oxo/hydroxo clusters: effect of redox-inactive metals.
Heterometallic triiron-oxo/hydroxo clusters: effect of redox-inactive metals.
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DOI:
10.1021/ja4104974
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发表时间:
2013-12-26
影响因子:
15
通讯作者:
Agapie T
中科院分区:
文献类型:
--
作者:
Herbert DE;Lionetti D;Rittle J;Agapie T
A series of tetranuclear oxo/hydroxo clusters comprised of three Fe centers and a redox-inactive metal (M) of various charge is reported. Crystallographic studies show an unprecedented Fe3M(μ4-O)(μ2-OH) core that remains intact upon changing M or the oxidation state of iron. Electrochemical studies reveal that the reduction potentials (E1/2) span a window of 500 mV and depend upon the Lewis acidity of M. Using the pKa of the redox-inactive metal aqua complex as a measure of Lewis acidity, these compounds display a linear dependence between E1/2 and acidity with a slope of ca. 70 mV per pKa unit. The current study of [Fe3MO(OH)] and previous ones of [Mn3MOn] (n = 2, 4) moieties support the generality of the above relationship between the reduction potentials of heterometallic oxido clusters and the Lewis acidity of incorporated cations, as applied to clusters of different redox-active metals.
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