Search results for "analítica"
showing 10 items of 127 documents
A chirality-induced alpha phase and a novel molecular magnetic metal in the BEDT-TTF/tris(croconate)ferrate(iii) hybrid molecular system
2006
The novel paramagnetic and chiral anion [Fe(C5O5)3]32 has been combined with the organic donor BEDT-TTF (= ET = bis(ethylenedithio)tetrathiafulvalene) to yield the first chirality- induced α phase and a paramagnetic metal. Gomez Garcia, Carlos, Carlos.Gomez@uv.es ; Coronado Miralles, Eugenio, Eugenio.Coronado@uv.es ; Gimenez Saiz, Carlos, Carlos.Gimenez@uv.es
La evolución de las puntas de proyectil en la transición a las economías productoras en el Este y Noreste de la Península Ibérica: implicaciones filo…
2020
La transición del Mesolítico al Neolítico constituye uno de los grandes temas de debate en la literatura arqueológica. Tradicionalmente, los diferentes enfoques aplicados se han concentrado en varios aspectos susceptibles de aportar información desde el punto de vista sociocultural: la discusión sobre el impacto démico y/o cultural, la cerámica como marcador de las primeras comunidades neolíticas, el marco cronológico del proceso y también el análisis comparativo de la industria lítica. En este último aspecto se ha puesto especial énfasis en los microlitos geométricos, en tanto que su variabilidad estilística puede aportar gran cantidad de información con respecto a los procesos de transmis…
Guía multimedia de operaciones básicas en análisis químico, farmacéutico y medioambiental
2008
En el presente proyecto se ha desarrollado una guía multimedia en formato electrónico como recurso de apoyo para la enseñanza y aprendizaje de las técnicas básicas del laboratorio analítico. La guía contiene ocho apartados donde los estudiantes pueden encontrar fácilmente información sobre las características de los reactivos químicos, descripción del material de laboratorio de uso frecuente, cómo se debe manejar y limpiar dicho material, instrucciones para no cometer errores en la operación de pesada de un sólido, como preparar de forma correcta una disolución, como llevar a cabo una valoración y las distintas etapas necesarias para calibrar un instrumento de medida, desde la preparación d…
Efficient deep-red light-emitting electrochemical cells based on a perylenediimide-iridium-complex dyad
2009
A two-layer light-emitting electrochemical cell device based on a new perylenediimide-iridium-complex dyad is presented emitting in the deep-red region with high external quantum efficiencies (3.27%). Costa Riquelme, Ruben Dario, Ruben.Costa@uv.es ; Orti Guillen, Enrique, Enrique.Orti@uv.es ; Bolink, Henk, Henk.Bolink@uv.es ; Gierschner, Johannes, Johannes.Gierschner@uv.es
Comparative enantioseparation of planar chiral ferrocenes on polysaccharide‐based chiral stationary phases
2022
Planar chiral ferrocenes are well-known compounds that have attracted interest for application in synthesis, catalysis, material science, and medicinal chemistry for several decades. In spite of the fact that asymmetric synthesis procedures for obtaining enantiomerically enriched ferrocenes are available, sometimes, the accessible enantiomeric excess of the chiral products is unsatisfactory. In such cases and for resolution of racemic planar chiral ferrocenes, enantioselective high-performance liquid chromatography (HPLC) on polysaccharide-based chiral stationary phases (CSPs) has been used in quite a few literature articles. However, although moderate/high enantioselectivities have been ob…
Unexpected photochemistry and charge-transfer complexes of [CB11H12]2 carborane
2008
Although the [CB11H12]¯carborane does not exhibit an absorption band inUV, its triplet excited state can be generated upon 308 nm laser excitation; also unexpectedly carborane acts as electron donor forming a charge transfer complex with methylviologen that upon illumination gives rise to viologen radical cation. Galletero Pedroche, M.Sales, Sales.Galletero@uv.es
Mechanistic studies on the photogeneration of o- and p-xylylenes from α,α′-dichloroxylenes
1998
Two-colour two-laser techniques have unambiguously proved that photolysis of the o-/p-(chloromethyl)benzyl radical leads to the sequential two-photon generation of o-/pxylylene from α,α'-dichloro-o-/p-xylene. Perez Prieto, Julia, Julia.Perez@uv.es
Coordination polymers undergoing spin crossover and reversible ligand exchange in the solid
2006
Here we report the synthesis and characterisation of a polymer made up of a system of parallel 2-D grids of Fe(II) ions linked by [Au(CN)2]– bridges and its transformation into a new system of three interpenetrated 3-D coordination open frameworks with the NbO topology. Reversibility of this crystal-to-crystal transformation is evidenced by X-ray crystallographic data and from their spin crossover properties. Real Cabezos, Jose Antonio, Jose.A.Real@uv.es
Use of Spectroscopic Techniques to Monitor Changes in Food Quality during Application of Natural Preservatives: A Review
2020
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Dependence of enzyme reaction mechanism on protonation state of titratable residues and QM level description: lactate dehydrogenase
2005
We have studied the dependence of the chemical reaction mechanism of L-lactate dehydrogenase (LDH) on the protonation state of titratable residues and on the level of the quantum mechanical (QM) description by means of hybrid quantum-mechanical/molecular-mechanical (QM/MM) methods; this methodology has allowed clarification of the timing of the hydride transfer and proton transfer components that hitherto had not been possible to state definitively. Ferrer Castillo, Silvia, Silvia.Ferrer@uv.es, Silla Santos, Estanislao, Estanislao.Silla@uv.es ; Tuñon Garcia de Vicuña, Ignacio Nilo, Ignacio.Tunon@uv.es