Síntesis y caracterización de los nuevos molibdoteluratos y wolframoteluratos: Estudio comparativo de heteropolioxometalatos con la estructura Anderson-Evans

Síntesis y caracterización de seis nuevos molibdoteluratos de imidazol, pirazol, 1-metil-i, 2-metil- y 4-metil-imidazol, dos nuevos wolframoteluratos de imidazol y 4-metil-midazol; finalmente dos nuevos hexaaquomolibdoteluratos con metales de transición de Ni(II) y Co(II). Todos los citados compuestos han sido caracterizados por: análisis elemental, EDAX, XPS, difracción de rayos-X en monocristal y de polvo (en el caso del compuesto de Co(II)). Se ha hecho un estudio, por primera vez, de la distorsión de la unidad octáedrica con todos los polianiones conocidos hasta este momento. Se ha hecho, por primera vez, un estudio en disolución utilizando la RMN de 95Mo y 183W para las especies aniónicas (TeMo6O24)6- y (TeW 6O24),6- asi como la RMN de 125 Te para las citadas especies aniónicas. Destacar que se han utilizado estas bases orgánicas debido a su actividad biológica pues existen en estos compuestos, interacciones por puentes de hidrógenos, haciéndose por primera vez este tipo de estudio desde el punto de vista del carácter proton-aceptor. Por primera vez, estudios termogravimétricos-calorimétricos y obtención de parámetros cinéticos en los compuestos donde existen pérdidas de moléculas de agu

New achievements on C-C bond formation in water catalyzed by metal complexes

The C-C coupling is the best strategy to obtain new organic molecules and building blocks from economical and abundant small molecules. Traditionally these reactions are accomplished in organic solvents, which are often dried before use as water molecules can react quickly with both the catalyst or the intermediate of the reactions, blocking the catalytic cycle. Nevertheless, the efforts of the researchers are providing new synthetic procedures in water that can substitute some of those, previously developed, "dry reactions". In the last years, really useful processes to obtain C-C bonds in water were proposed. These reactions usually are catalysed with 4d-metals but also examples with metals of the first transition row were proposed. This review aims to summarize and order by types the C-C coupling catalytic reactions in water published during the last five years. The abundance of reactions and the significance of the published results shows that a long way is needed to achieve a good knowledge of catalytic C-C coupling reactions in water. Nevertheless, accomplish this objective can provide significant and valuable synthetic processes, more economical, cleaner, more selective, therefore friendlier and more respectful with nature. (C )2021 Elsevier B.V. All rights reserved.Authors thank to the University of Almeria for the project PPUENTE2020/011 and the Junta de Andalucia for funding research PAI team FQM-317

Aditivacion de resinas epoxi mediante complejos poliméricos homo y heterometálicos con 1,3,5-triaza-7-fosfaadamantanofosfina (PTA) y 3,7-dimetil-1,3,7-triaza-5-phosphabiciclo[3.3.1]nonane (dmoPTA)

Publication number: ES2627009 A1 (26.07.2017) Also published as: ES2627009 B2 (22.01.2018) Application number: P201600099 (26.01.2016)La presente invención se relaciona con el uso de polímeros homo y heterometálicos con el ligando 1,3,5-triaza-7-fosfaadamantanofosfina (PTA) y 3,7-dimetil-1,3,7-triaza-5-phosphabiciclo[3.3.1]nonane) (dmoPTA), como aditivos de resinas epoxídicas. Estos aditivos previa disolución o suspensión mejoran y modifican las propiedades de las resinas confiriéndoles nuevas propiedades como color, conductividad eléctrica y magnética, resistencia térmica y al fuego, flexibilidad, distinto tiempo de curado, entre otras propiedades.Universidad de Almerí

Cuaderno de prácticas virtual de Fitopatología Molecular de Plantas

Memoria ID12-0167. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2012-2013

Quantum metrology at the limit with extremal Majorana constellations

Quantum metrology allows for a tremendous boost in the accuracy of measurement of diverse physical parameters. The estimation of a rotation constitutes a remarkable example of this quantum-enhanced precision. The recently introduced Kings of Quantumness are especially germane for this task when the rotation axis is unknown, as they have a sensitivity independent of that axis and they achieve a Heisenberg-limit scaling. Here, we report the experimental realization of these states by generating up to 21-dimensional orbital angular momentum states of single photons, and confirm their high metrological abilities

New Findings in Metal Complexes with Antiproliferative Activity Containing 1,3,5-Triaza-7-phosphaadamantane (PTA) and Derivative Ligands

This minireview summarizes some of the most significant findings published in the last years on metal complexes containing PTA and PTA derivatives ligands such as dmoPTA, with antiproliferative activity [PTA = 1,3,5-triaza-7-phospha- adamantane; dmoPTA = 3,7-dimethyl-1,3,7-triaza-5-phosphabicyclo[ 3.3.1]nonane (dmoPTA)]. Comments on other biological properties of the complexes are also included

Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634

With its remarkable double-S shape, IC 4634 is an archetype of point-symmetric planetary nebulae (PN). In this paper, we present a detailed study of this PN using archival HST WFPC2 and ground-based narrow-band images to investigate its morphology, and long-slit spectroscopic observations to determine its kinematics and to derive its physical conditions and excitation. The data reveal new structural components, including a distant string of knots distributed along an arc-like feature 40"-60" from the center of the nebula, a skin of enhanced [O III]/H-alpha ratio enveloping the inner shell and the double-S feature, and a triple-shell structure. The spatio-kinematical study also finds an equatorial component of the main nebula that is kinematically independent from the bright inner S-shaped arc. We have investigated in detail the bow shock-like features in IC 4634 and found that their morphological, kinematical and emission properties are consistent with the interaction of a collimated outflow with surrounding material. Indeed, the morphology and kinematics of some of these features can be interpreted using a 3D numerical simulation of a collimated outflow precessing at a moderate, time-dependent velocity. Apparently, IC 4634 has experienced several episodes of point-symmetric ejections oriented at different directions with the outer S-shaped feature being related to an earlier point-symmetric ejection and the outermost arc-like string of knots being the relic of an even much earlier point-symmetric ejection. There is tantalizing evidence that the action of these collimated outflows has also taken part in the shaping of the innermost shell and inner S-shaped arc of IC 4634.Comment: 16 pages, 11 figures, accepted for publication in The Astrophysical Journa