Search results for "coordination"

Magnetic materials based on coordination chemistry: from switching molecules to multifunctional magnets

2021

Esta tesis tiene como objetivo principal la preparación de materiales moleculares multifuncionales magnéticos. Para ello se han usado dos estrategias diferentes: una aproximación iónica, en la que se han preparado sales de cationes funcionales y se han combinado con redes aniónicas extendidas (capítulos 2 y 3); y la segunda estrategia, donde, a través de enlaces covalentes entre ligandos funcionales y fulerenos (capitulo 4), o polioxometalatos (capítulo 5) se han obtenido sistemas que presentan la propiedad de transición de espín con efectos sinérgicos. En el capítulo 2 se presenta la síntesis y caracterización de varios polímeros de coordinación basados en el ligando anilato con cationes i…

Hybrid magnetic materials based on coordination chemistry: from switching magnetic molecules to 2D coordination polymers

2015

El trabajo descrito en esta tesis se encuadra en el ámbito de los materiales moleculares. Presenta varias estrategias para preparar nuevos materiales híbridos multifuncionales. Los complejos de transición de espín (SCO) constituyen uno de los ejemplos más espectaculares de biestabilidad molecular. En estos sistemas, las transiciones entre los estados de bajo espín (LS) y alto espín (HS) pueden estar inducidos por una variedad de estímulos externos (temperatura, presión o radiación electromagnética). Además de los interesantes aspectos fundamentales, este fenómeno es de interés creciente en el área de los materiales funcionales debido a las posibles aplicaciones en sensores, memorias o dispo…

On the synthesis of functionalized porphyrins and porphyrin conjugates via β-aminoporphyrins

2016

International audience; The synthesis of functionalized porphyrins and their conjugates from meso-tetraarylporphyrins through the acylation and the oxidation of beta-aminoporphyrins was investigated. 2,3-Dioxochlorins were prepared by the oxidation of a variety of beta-aminoporphyrins and subsequently used in a condensation reaction with functionalized aromatic aldehydes and ammonium acetate to form beta-functionalized porphyrins bearing a fused imidazole ring. Under optimized experimental conditions both reactions tolerate various functional groups and afford the products in an appropriate overall yield. The mildness and usefulness of this methodology are illustrated by several examples in…

Anticipatory postural adjustments during joint action coordination

2019

International audience; There is a current claim that humans are able to effortlessly detect others’ hidden mental state by simply observing their movements and transforming the visual input into motor knowledge to predict behaviour. Using a classical paradigm quantifying motor predictions, we tested the role of vision feedback during a reach and load-lifting task performed either alone or with the help of a partner. Wrist flexor and extensor muscle activities were recorded on the supporting hand. Early muscle changes preventing limb instabilities when participants performed the task by themselves revealed the contribution of the visual input in postural anticipation. When the partner perfo…

Shared Situational Awareness in a Professional Soccer Team: An Explorative Analysis of Post-Performance Interviews

2020

Sport science research has done little to elaborate on the cognitive factors that turn a collection of individual players into a coordinated elite team. The purpose of this paper is to clarify if the players and coach of an elite soccer team express shared situational awareness. Ten players and one coach were exposed to twelve video pictures from a previous soccer match, and their statements for each picture were recorded and analyzed using a qualitative approach. Two of five game situations were with ball possession and three out of seven were without ball possession

An Economic Definition of the City

1998

International audience

Coordination orientée agents des mobilités parallèles en milieu urbain : concepts, enjeux et modèles d'usages.

2017

International audience

Gallium(III) and Indium(III) Complexes with meso-Monophosphorylated Porphyrins: Synthesis and Structure. A First Example of Dimers Formed by the Self…

2017

International audience; The synthesis and structural characterization, both in solution by means of H-1 and P-31 NMR and UV-vis spectroscopies and in the solid state by X-ray diffraction on single crystal, of a series of gallium(III) and indium(III) meso-mono(diethoxyphosphoryl)porphyrins bearing different peripheral substituents as well as the corresponding monoesters and phosphonic acids are reported. This work describes the first example of the X-ray structure of a self-assembled dimer formed via strong binding between the oxygen atom of the phosphonate substituent and the gallium(III) cations of adjacent porphyrin molecules [Ga-O = 1.9708(13) angstrom].

Knowledge sharing : challenges in inter-project cooperation

2000

Global investments in pandemic preparedness and COVID-19: development assistance and domestic spending on health between 1990 and 2026

2023

Background The COVID-19 pandemic highlighted gaps in health surveillance systems, disease prevention, and treatment globally. Among the many factors that might have led to these gaps is the issue of the financing of national health systems, especially in low-income and middle-income countries (LMICs), as well as a robust global system for pandemic preparedness. We aimed to provide a comparative assessment of global health spending at the onset of the pandemic; characterise the amount of development assistance for pandemic preparedness and response disbursed in the first 2 years of the COVID-19 pandemic; and examine expectations for future health spending and put into context the expected ne…