TY - JOUR
T1 - 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
AU - Harris, T. David
AU - Castellani, Michael P.
AU - Rheingold, Arnold L.
AU - Reiff, William M.
AU - Yee, Gordon T.
N1 - Funding Information:
We acknowledge financial support from the Donors of the Petroleum Research Fund, administered by the American Chemical Society (PRF 34614-AC), the National Science Foundation (CHE-023488 for the purchase of the SQUID and CHE-0243704 for the support of T.D.H.) and the ASPIRES program at Virginia Tech. We also thank Dr. Robert Shull of the National Institute of Standards and Technology, Gaithersburg, MD for the use of the SQUID magnetometer for gathering preliminary data and Dr. Guangbin Wang and Mr. P. Weinberger for helpful experimental assistance.
PY - 2006/11/1
Y1 - 2006/11/1
N2 - 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).
AB - 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).
KW - Charge-transfer salt
KW - Magnetism
KW - Metallocene
UR - http://www.scopus.com/inward/record.url?scp=33748566279&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33748566279&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2006.07.039
DO - 10.1016/j.ica.2006.07.039
M3 - Article
AN - SCOPUS:33748566279
VL - 359
SP - 4651
EP - 4654
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
IS - 14
ER -