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Fundamental aspects of the amorphous state of metal organic compounds: a solid state magnetic resonance approach

Abstract

The main objective of this proposal is to catalyze a new line of research within the Magnetic Resonance Group of IFSC-USP. The research will focus on the structural characterization of non-crystalline Metal-Organic Frameworks (MOFs), Coordination Polymers (CPs) and other Hybrid Materials. Great attention has been paid to research on MOFs since their discovery. Thanks to their chemical versatility and the possibility of permanent porosity (with the largest surface areas reported to date), these compounds are candidates for a variety of applications, such as gas storage, separation of molecular species, energy storage, catalysis, photonics, pharmaceuticals, among others. The vast majority of works on this field focus on the crystalline domain. However, in the last decade it has been noticed that many of the relevant properties of MOFs are not linked to their crystallinity. On the contrary, the transition to the amorphous domain provides a variety of advantages for these materials, such as the possibility of obtaining single monolithic morphology, absence of grain boundaries, presence of defects as functionalization pathways and size/shape flexibility. Since then, there has been a growing interest in amorphous structured MOFs, especially glass-forming ones. Research in this field is still on its early stages. There are many open questions regarding the understanding of the structure of these materials and the amorphization mechanisms. Due to its amorphous character, techniques widely used for the structural determination of crystalline materials, such as X-ray diffraction, cannot be applied. Solid state Nuclear Magnetic Resonance (NMR) spectroscopy is an excellent, and currently underexplored, tool for the characterization of local environments in such amorphous systems. To contribute to this field, we propose to carry out a detailed structure characterization of selected compositions, mainly using NMR and Electronic Paramagnetic Resonance (EPR) techniques, in particular employing technical approaches not yet applied to amorphous MOFs and CPs. These techniques can provide local information about (i) the structure of organic ligands; (ii) the chemical environment of the metallic sites; (iii) the interaction between organic and inorganic components; and (iv) the distribution of ligands at the metal center (in the case of mixed ligand compounds). Along with this goal, we will form human resources by training undergraduate and graduate students with multidisciplinary concepts of solid state NMR and EPR and materials science. Finally, at more advanced stage, the project will explore new compositions of vitreous MOFs and composites, focusing mainly on materials with promising luminescent properties, for future photonic applications. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FLORES, ALI F. GARCIA; MUNEVAR, JULIAN; DE OLIVEIRA, MARCOS; RETTORI, CARLOS; URBANO, RICARDO R.; DE QUEIROZ, THIAGO B.. Relaxation Processes in Rare-Earth-Doped a-NaYF4 Nanoparticles by Nuclear Magnetic Resonance Spectroscopy. Journal of Physical Chemistry C, v. 127, n. 37, p. 11-pg., . (22/02974-1, 19/09673-4, 20/13466-1, 17/10581-1)
MARCOS, FRANCIELLE CANDIAN FIRMINO; COSTA, MARIA JOSE FONSECA; CATUZO, GABRIEL L.; DE MORAES, DANIEL ANGELI; DE OLIVEIRA JR, MARCOS; MASTELARO, VALMOR ROBERTO; ASSAF, JOSE MANSUR; GIUDICI, REINALDO; ASSAF, ELISABETE MORREIRA. Supported Cu catalysts on UiO-66 toward enhanced methanol selectivity by CO2 hydrogenation: Effect of Cu loading. JOURNAL OF CATALYSIS, v. 427, p. 9-pg., . (17/08293-8, 22/02974-1, 20/15230-5)

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