2 resultados para Casares, Tomás
em Brock University, Canada
Resumo:
The main purpose of this thesis is to study properties of La2/3Cai/3Mn03, both polycrystalline
ceramics and thin films. This material has striking related electrical and
magnetic properties. Thin films show colossal negative magnetoresistance (CMR) near
transition from an insulating to a metallic state accompanied closely by transition from
a paramagnetic to a ferromagnetic state. The double exchange mechanism (DE) and the
Jahn-Teller deformations play an important role in CMR effect. Applied pressure has a
very similar effect as does an applied magnetic field, except, at low temperatures (T
Resumo:
Boron tribalide complexes of 1,1-bis(dimethylamino)ethylene (DME) , t etramethylurea (TMU), tetramethylguanidine (TMG) , and pentamethylguanidine (PMG) and also mixed boron t r ihalide adducts of DME have been investigated by 1H and 19F NMR spectroscopy. Both nitrogen and the C-Q-H carbon of DME are possible donor a toms to boron trihal ides but complexation has been found to occur only at carbon of DME. The initial adduct acts as a Bronsted acid and gives up a proton to free DME in solut ion. A side reaction in the DME-BF, system gives rise to trace amounts of a complex aSSigned as (DME)2BF2+. (DME)2BF2+ is produced in much larger quantities in t he DME-BF3-BC13 and DME-BF,-BBr, systems by reaction of free DME with DME:BF2X (X = Cl, Br). Restricted r otation about the C-N bonds of TMUlBC13 and n1U:BBr3 has been observed at low temperatures. This complements previous work in this system and confirms oxygen donation of TMU to boron trihalides . Restricted rotation at low temperatures also has been observed in DMEboron trihalide systems