Seminaris a càrrec del Dr. Joel Miller
Els propers dies 15 i 16 de Desembre el Dr. Joel Miller de la University of Utah, UT (EEUU) impartirà dos seminaris que porten per títol:
Molecule-based Magnets: New Chemistry and New Materials for this Millenium
El primer seminari tindrà lloc a Tarragona el dia 15 de Desembre a la sala de Graus de la Facultat de Química de la Universitat Rovira i Virgili a les 12:00.
El segon seminari tindrà lloc a Barcelona el dia 16 de Desembre a l’aula 303 de la Facultat de Química de la Universitat de Barcelona a les 12:00.
“Molecule-based materials exhibiting the technologically important property of bulk magnetism have been prepared and studied in collaboration with many research groups worldwide frequently exhibit supramolecular structures. These magnets are prepared via conventional organic chemistry methodologies, but unlike classical inorganic-based magnets do not require metallurgical processing. Furthermore, these magnets are frequently soluble in conventional solvents (e. g., toluene, dichloromethane, acetonitrile, THF) and have saturation magnetizations more than twice that of iron metal on a mole basis as well as in some cases coercive fields exceeding that of Co5Sm. Also magnets with critical temperatures exceeding room temperature have been prepared. In addition to an overview of magnetic behavior, numerous examples of structurally characterized magnets made from molecules will be presented. These will include [MIII(C5Me5)2][A], [MnIII(porphyrin)][A] (A = cyanocarbon etc. electron acceptors) as well as M[TCNE]x, which for M = V is a room temperature magnet, which can be fabricated as a thin film magnet. A new class of magnets of [RuII/III2(O2CR)4]3[MIII(CN)6] (M = Cr, Fe; R = Me, t-Bu) composition will also discussed. For R = Me an interpenetrating cubic (3-D) lattice forms and the magnet exhibits anomalous hysteresis, saturation magnetization, out-of-phase.”(T), AC susceptibility, and zero field cooled-field cooled temperature-dependent magnetization data. This is in contrast to R = t-Bu, which forms a layered (2-D) lattice. These will be discussed.”