1,1´-Diethyl-2,2´,3,3´,4,4´,5,5´-octamethylferrocenium Tetracyanoethylenide, [Fe(C5EtMe4)2]+[TCNE]–, a Charge-Transfer Salt Magnetic Solid with a Novel Structural Motif

Authors

T. David Harris, Marshall University
Michael Castellani, Marshall UniversityFollow
Arnold L. Rheingold
William M. Reiff
Gordon T. Yee

Document Type

Article

Publication Date

2006

Abstract

1,1′-Diethyl-2,2′,3,3′,4,4′,5,5′-octamethylferrocene has been utilized as a one-electron donor in the synthesis of a tetracyanoethylene charge-transfer salt, [Fe(C₅EtMe₄)₂]⁺[TCNE]⁻. Structural characterization shows that it adopts an arrangement of anions and cations completely different from the usual π stacking seen in analogous decamethylferrocenium compounds. The TCNE radical sits along side of the ferrocene, nearly perpendicular to the planes of the C₅ rings. The nearly square geometry of the TCNE anion creates disorder over two orientations. [Fe(C₅EtMe₄)₂]⁺[TCNE]⁻ is a simple paramagnet exhibiting neither long-range magnetic order nor slow paramagnetic relaxation to the lowest measured temperatures (ca. 1.8 K) as determined by both ac and dc magnetic susceptibility and Mössbauer spectroscopy (ca. 1.3 K).

Comments

This is the authors’ peer-reviewed manuscript. The version of record is available from the publisher at https://doi.org/10.1016/j.ica.2006.07.039. Copyright © 2006 Elsevier. All rights reserved.

Recommended Citation

Harris, T. D.; Castellani, M. P.; Rheingold, A. L.; Reiff, W. M.; Yee, G. T., 1,1′-Diethyl-2,2′,3,3′,4,4′,5,5′-octamethylferrocenium tetracyanoethylenide,[Fe (C5 EtMe4) 2]+[TCNE]−, a charge-transfer salt magnetic solid with a novel structural motif. Inorganica Chimica Acta 2006, 359 (14), 4651-4654.