Estudo espectroscópico de compósito obtido da reação no estado sólido entre um complexo mononuclear de vanádio(IV) e caulinita

Abstract

Recebido em 17/11/10; aceito em 11/7/11; publicado na web em 2/9/11 SPECTROSCOPIC STUDIES OF COMPOSITE OBTAINED FROM SOLID STATE REACTION BETWEEN A MONONUCLEAR VANADIUM(IV) COMPLEX AND KAOLINITE. The use of probes, such as paramagnetic species diluted in diamagnetic materials in EPR spectroscopy, and mathematical tools such, as the Kubelka-Munk function in DRUV-VIS spectroscopy are strategies in the analysis of complex mixtures of solid materials. The results obtained here show that the solid state reaction between the complex, [VO(acac)(BMIMAPY)] [ClO 4 ], BMIMAPY = [(bis(1-methylimidazole-2-yl)methyl)(2-(pyridyl-2-yl)ethyl) amine] and acac = acetilacetonate, with kaolinite turns possible to obtain anisotropic EPR spectrum of the complex with a reasonable level of resolution. The study by DRUV-VIS using the method of second derivative mode of the Kubelka-Munk function revealed new complex structural arrangements, a solid hitherto unknown.

Propriedades em areias a verde com caulim para moldes de fundição

“…As argilas cauliníticas possuem partículas de caulinita formada normalmente por placas hexagonais apresentando a fórmula estrutural da cela unitária Al 4 Si 4 O 10 (OH) 8 com composição percentual expressa em termos de óxidos de SiO 2 -46,54%; Al 2 O 3 -39,50%; H 2 O -13,96% [7]. A maioria das partículas grandes tendem a formar empilhamentos de partículas menores.…”