| Department of Chemistry | University of Guelph | (GWC)2 |
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Dr. Kathryn E. Preuss, Associate Professor | ||
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KEYWORDS : molecular magnets, molecular conductors, molecular materials, thiazyls, stable radicals, EPR, paramagnetic NMR, valence tautomers, molecular switches |
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"Molecular materials" are crystalline, amorphous or liquid crystalline materials composed of arrays of molecules, as opposed to solid state materials in which no identifiable molecular components exist (e.g., ionic solids such as NaCl.) The bulk material properties arise from the molecular design, thus molecule-based materials are highly "tunable" using well-understood synthetic chemical methodology. Designing materials at a molecular level not only imparts a huge amount of control on a bulk property but also allows for the incorporation of multiple potentially desirable properties. Imagine, for example, a paint or coating that can store digital data. Molecular magnets, molecular conductors, single molecule magnets (SMMs), organic light emitting diodes (oLEDs) and molecular switches are examples of molecular materials. The rational design and preparation of molecular materials with perdictable and/or controllable magnetic properties is one of our research goals. Our approach involves the development of new spin-bearing ligands, based on thiazyl radicals, and the coordination of these ligands to paramagnetic metal ions. Selection of publications in refereed journals: Fatila, E. M.; Goodreid, J.; Clerac, R.; Jennings, M.; Assoud, J.; Preuss, K. E. "High-Spin Supramolecular Pair of Mn(II)/Thiazyl Radical Complexes" Chem. Commun. 2010, DOI:10.1039/C0CC01084G. Fatila, E. M.; Jennings, M. C.; Goodreid, J.; Preuss, K. E. "A third polymorph of 4-(2,6-difluorophenyl)-1,2,3,5-dithiadiazolyl" Acta Cryst. C 2010, C66, o260. MacDonald, D. J.; Jennings, M. C.; Preuss, K. E. "A new polymorph of dichloridotriphenylantimony" Acta Cryst. C 2010, C66, m137. Hearns, N. G. R.; Clerac, R.; Jennings, M.; Preuss, K. E. "Manipulating the crystal packing of pyDTDA radical ligand coordination complexes with Mn(II) and Ni(II)" Dalton Trans. 2009, 3193. Hearns, N. G. R.; Fatila, E. M.; Clerac, R.; Jennings, M.; Preuss, K. E. "Ni(II) and hs-Fe(II) Complexes of a Paramagnetic Thiazyl Ligand, and Decomposition Products of the Iron Complex, Including an Fe(III) Tetramer" Inorg. Chem. 2008, 47, 10330. Preuss, K. E."Metal Complexes of Thiazyl Radicals" Perspective article in Dalton Trans. 2007, 2357. Britten, J.; Hearns, N. G. R.; Preuss, K. E., Richardson, J. F.; Bin-Salamon, S. "Mn(II) and Cu(II) Complexes of a Dithiadiazolyl Radical Ligand: Monomer/Dimer Equilibria in Solution" Inorg. Chem. 2007, 46, 3934. Hearns, N. G. R.; Hesp, K. D.; Jenning, M.; Korcok, J. L.; Preuss, K. E.; Smithson, C. S. "Monodentate N-coordination of a 1,2,3,5-Dithiadiazolyl to Mn(II), Co(II) and Ni(II): A New Coordination Mode" Polyhedron (ICMM Special Issue), 2007, 26, 2047 Hearns, N. G. R.; Korcok, J. L.; Paquette, M. M.; Preuss, K. E. "Dinuclear Cobalt Bis(dioxolene) Complex Exhibits Two Sequential Thermally Induced Valence Tautomeric Transitions" Inorg. Chem. 2006, 45, 8817. Bin-Salamon, S.; Brewer, S. H.; Depperman, E. C.; Franzen, S.; Kampf, J. W.; Kirk, M. L.; Kumar, R. K.; Lappi, S.; Peariso, K.; Preuss, K. E.; Shultz, D. A. "Testing Bridge-mediated Differences in Dinuclear Valence Tautomeric Behavior" Inorg. Chem., 2006, 45, 4461. Jennings, M.; Preuss, K. E.; Wu, J. "Synthesis and Magnetic Properties of a 4-(2'-Pyrimidyl)-1,2,3,5-Dithiadiazolyl Dimanganese Complex" Chem. Commun., 2006, 341-343. Preuss, K. E.; Wu, J.; Jennings, M. "Bis(1,1,1,5,5,5-hexafluoroacetylacetonato-K^2;O,O')-bis(tetrahydrofuran-K-N)iron(II)" Acta Cryst., 2005, E61, m430-m432. Hearns, N. G. R.; Preuss, K. E.; Richardson, J. F.; Bin-Salamon, S. "Design and Synthesis of a 4-(2'-Pyridyl)-1,2,3,5-Dithiadiazolyl Cobalt Complex" J. Am. Chem. Soc., 2004, 126, 9942-9943. |
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| ©2006 Kathryn E. Preuss |
