Structural and Spectroscopic Evidence for a Side-on Fe(III)-Superoxo Complex Featuring Discrete O-O Bond Distances.
Structural and Spectroscopic Evidence for a Side-on Fe(III)-Superoxo Complex Featuring Discrete O-O Bond Distances.
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作者:
Pan HR;Chen HJ;Wu ZH;Ge P;Ye S;Lee GH;Hsu HF
The O–O bond length is often used as a structural indicator to determine the valence states of bound O2 ligands in biological metal–dioxygen intermediates and related biomimetic complexes. Here, we report very distinct O–O bond lengths found for three crystallographic forms (1.229(4), 1.330(4), 1.387(2) Å at 100 K) of a side-on iron–dioxygen species. Despite their different O–O bond distances, all forms possess the same electronic structure of Fe(III)–O2•–, as evidenced by their indistinguishable spectroscopic features. Density functional theory and ab initio calculations, which successfully reproduce spectroscopic parameters, predict a flat potential energy surface of an η2-O2 motif binding to the iron center regarding the O–O distance. Therefore, the discrete O–O bond lengths observed likely arise from differential intermolecular interactions in the second coordination sphere. The work suggests that the O–O distance is not a reliable benchmark to unequivocally identify the valence state of O2 ligands for metal–dioxygen species in O2-utilizing metalloproteins and synthetic complexes.
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影响因子:
15
作者:
Chiang, Chien-Wei;Kleespies, Scott T.;Stout, Heather D.;Meier, Katlyn K.;Li, Po-Yi;Bominaar, Emile L.;Que, Lawrence, Jr.;Muenck, Eckard;Lee, Way-Zen
通讯作者:
Lee, Way-Zen
影响因子:
62.1
作者:
Elwell CE;Gagnon NL;Neisen BD;Dhar D;Spaeth AD;Yee GM;Tolman WB
通讯作者:
Tolman WB
影响因子:
4.4
作者:
BECKE, AD
通讯作者:
BECKE, AD
影响因子:
4.9
作者:
de Sousa, David P.;Bigelow, Jennifer O.;McKenzie, Christine J.
通讯作者:
McKenzie, Christine J.
影响因子:
15
作者:
Aboelella, NW;Lewis, EA;Tolman, WB
通讯作者:
Tolman, WB