title: Magnetic ordering in the rare earth molecule-based magnets, Ln(TCNE)(3) (Ln = Gd, Dy; TCNE = tetracyanoethylene).
abstract: The reaction of LnI(3) x xMeCN (Ln = Gd, Dy) and TCNE (tetracyanoethylene) in acetonitrile forms Ln(2)[C(4)(CN)(8)](3) x xMeCN. These paramagnetic light-colored solids contain the S = 0 octacyanobutandiide dianion, [C(4)(CN)(8)](2-), which upon desolvation of these products forms dark green Ln(TCNE)(3). In these compounds the central C[bond]C sigma bond in [C(4)(CN)(8)](2-) is broken, re-forming S = 1/2 [TCNE]*(-). as evidenced by the color change and the infrared spectra. Ln(TCNE)(3) exhibit coupling between Ln(3+) and [TCNE]*(-) and magnetically order as ferrimagnets at 8.5 (Dy) and 3.5 (Gd) K.
authors.affiliation: Department of Chemistry, University of Utah, 315 S. 1400 E. RM 2124, Salt Lake City, Utah 84112-0850, USA.
authors.forename: James W
authors.initials: JW
authors.lastname: Raebiger
authors.forename: Joel S
authors.initials: JS
authors.lastname: Miller