个人简介

BS Chemistry, University of California, Berkeley, CA, 1983 PhD Physical Chemistry, Stanford University, Stanford, CA, 1990 Postdoctoral Researcher, DuPont, 1990-1991 Assistant Professor of Chemistry, University of Colorado, Boulder, 1992-2000 Research Associate, Visiting Fellow and Instructor, Univ. of Colorado, Boulder, 2000-2001 Associate Professor of Chemistry, Virginia Tech, 2001-present

研究领域

Inorganic

We have previously published our work on a coordination polymer that results from the reaction of V(CO)6 and pentafluorophenyltricyanoethylene (1), which becomes magnetically ordered at 245 K. The compound is analogous to the first room temperature molecule-based magnet, V[TCNE]2, where TCNE = tetracyanoethylene. These solids are believed to be a network of V2+ cations bridged through the lone pairs on two or more nitrile nitrogen atoms on the organic radical anions to give a ferrimagnet. Motivation for trying to discover other organic acceptor bridging ligands comes from the observation that V[TCNE]2 and all other V-containing magnets found to date are air-sensitive, presumably because low valent vanadium is very oxophilic. However, analogous Mn, Fe, Co and Ni phases with TCNE are only magnetic at low temperatures, necessitating a search for tunable TCNE replacements. In unpublished work, we have found that the corresponding unfluorinated acceptor, 2, also supports magnetic order, albeit at the lower temperature of about 210 K. Although we expected to observe a smooth trend in Tc, the critical ordering temperature, with mono and poly fluorine substitution between these two extremes of 1 and 2, this prediction has proven to be incorrect. In particular, the 2,6-difluorophenyl compound (3) results in a magnetically ordered solid at 300 K (manuscript in preparation). Further examination of all of the mono- and di- fluorine substituted compounds, as well as their chlorine analogs, seems to indicate that both resonance and inductive effects from the halogen atoms play a role, but steric effects cannot be ruled out.

近期论文

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"Molecular Magnetic Materials" in Molecular Materials, 3rd ed. Bruce, D. W.; O’Hare, D.; Walton, R. I. Eds. John Wiley & Sons, 2010. "Synthesis, Structure and Magnetic Characterization of Decamethylmetallocenium Ethyl Tricyanoethylenecarboxylate Charge-Transfer Salts" Wang, G.; Slebodnick, C.; Butcher, R.; Yee, G. T. Inorg. Chim. Acta 2009, 362, 2423-2428. "Tunable Spin-crossover Behavior in Polymethylated Bis(indenyl)chromium(II) Complexes: the Significance of Benzo-Ring Substitution" Meredith, B. M.; Crisp, J. A.; Brady, E. D.; Hanusa, T. P.; Yee, G. T.; Pink, M.; Brennesel, W. W.; Young, V. G. Jr. Organometalllics 2008, 27, 5464-5473. "Room Temperature and Near-Room Temperature Molecule-Based Magnets" Harvey, M. D.; Crawford, T. D.; Yee, G. T. Inorg. Chem. 2008, 47, 5649-5655. "Synthesis, Structure and Magnetic Properties of a Geminal μ2-Tetracyanoethylene Radical Anion Bridged Coordination Polymer" Wang, G.; Slebodnick, C.; Yee, G. T. Inorg. Chim. Acta 2008, 361, 3593-3596.