Kingsley L. Taft, C. Delfs, G. Papaefthymiou
Feb 1, 1994
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Journal
Journal of the American Chemical Society
Abstract
The synthesis of [Fe(OMe) 2 (O 2 CCH 2 Cl)] 10 , a molecular ferric wheel, from basic iron chloroacetate and ferric nitrate in methanol is described. Spectroscopic analysis of methanol solutions used to prepare the compound revealed a (μ-oxo)(μ-carboxylato)diiron(III) intermediate having terminal oxygen donor ligands. The structure of the crystalline ferric wheel was revealed in a single crystal X-ray diffraction investigation. The molecule has idealized D 5d symmetry and consists of a 20-membered ring comprised of 10 ferric ions linked by 20 bridging methoxide and 10 bridging chloroacetate ligands. The 10 iron atoms are approximately coplanar and are coordinated in a distorted octahedral manner by 6 oxygen donor atoms