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The chemistry of materials containing Se oxyanions in the +4 oxidation state, such as selenite, hydrogenselenite, and oxoselenate, are of increasing interest in the research community for several reasons. First, the lone pair on the selenium atom can behave as structure-directing agent towards the formation of materials characterized by the presence of hollows or channels in their intimate structures, moreover, the weakly coordinative capability of the Se(IV) electron lone pairs could give rise to interesting supramolecular interactions, and finally, it is known that the incorporation of selenite anions can lead to non-centrosymmetric structures and, consequently, to materials displaying remarkable physicochemical properties. The most important feature is that the full comprehension of the properties of this type of materials cannot be exhaustively understood unless the complete solid state crystal structure is available. In this Special Issue, entitled “Crystal Structures of Compounds Containing Ions Selenite”, a series of new selenite-containing compounds synthesized by different methodologies and fully caracterized in the solid state is reported. Moreover the fundamental role of detailed structural analysis in understanding the interactions in the solid state that are responsible for the peculiar chemical–physical properties of such materials is discussed.

Molecular and crystal structure of materials incorporating selenite anions --- Full characterization of new selenite compounds --- NLO properties of selenite holding materials --- Supramolecular interactions derived from selenite containing structures --- MOF derived from selenite containing compounds

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Metal organic frameworks (MOFs) are a class of porous materials with a modular structure. This allows for very wide structural diversity and the possibility of synthesizing materials with tailored properties for advanced applications. Thus, MOF materials are the subject of intense research, with strong relevance to both science and technology. MOFs are formed by the assembly of two components: cluster or metal ion nodes, which are also called secondary building units (SBUs), and organic linkers between the SBUs, usually giving rise to crystalline structures with an open framework and significant porous texture development. The main aim of this Special Issue of Catalysts (ISSN 2073-4344) is to present the most relevant and recent insights in the field of the synthesis and characterization of MOFs and MOF-based materials for advanced applications, including adsorption, gas storage/capture, drug delivery, catalysis, photocatalysis, and/or chemical sensing.

Technology: general issues --- History of engineering & technology --- Materials science --- Metal–organic framework --- Lewis acid --- fructose --- 5-hydroxymethyl furfural --- biomass --- Metal-organic frameworks (MOFs) --- photocatalysis --- carbon dioxide reduction --- renewable energy --- heterogeneous catalysis --- metal organic framework --- surface modification --- Zinc glutarate --- CO2 fixation --- polycarbonate --- Mn-MOF-74 --- modification --- water resistance --- NH3-SCR performance --- environmental pollution --- filter --- gas sorption --- sensor --- hydrogen storage --- electrospinning --- one-pot hydrothermal --- immobilizing recombinant --- His-hCA II --- Ni-BTC nanorods --- metal–organic frameworks --- polyoxometalates --- hybrid materials --- synthesis --- catalysis --- heterogeneous catalyst --- aerobic oxidation --- cyclohexene --- metal organic frameworks --- NH2-MIL-125(Ti) --- water stability --- purification --- layered coordination polymer --- oxidative desulfurization --- denitrogenation extraction --- hydrogen peroxide --- lanthanides --- MOF --- catalyst --- microreactor --- kinetic studies --- metal organic frame works --- CO2 adsorption --- pre combustion --- gas membrane separation --- metal halide perovskites --- metal-organic framework --- fuel cell --- oxygen reduction reaction (ORR) --- metal organic frameworks (MOFs) --- hydrothermal synthesis --- coordination polymers --- crystal structures --- metal-organic frameworks --- carboxylate ligands --- olefin paraffin separations --- propyne --- propylene --- adsorption isotherms --- dynamic breakthrough --- n/a --- Metal-organic framework

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The quality of water is not only a technological and scientific issue, but a social and economic problem, in both developed and developing countries. Besides local regulations, which differ between regions and need constant upgrades, significant scientific developments are required in both the detection and removal of water contaminants. This Issue focuses on some recent advancements in the photocatalytic removal of organic pollutants, which is one of the aspects of the problem that involves the need of advanced catalysts and implies significant advancements in the field of materials science and chemical engineering.

History of engineering & technology --- indigo carmine --- resin --- Dielectric Barrier Discharge --- adsorption --- regeneration --- anatase/brookite biphasic --- nitrogen-doping --- sol-gel method --- visible light photocatalysis --- degradation of dyes --- polyaniline --- titanium dioxide --- copper(II) oxide --- cobalt oxide(II,III) --- photocatalytic fuel cell --- graphitic carbon nitride --- Fe doping --- Z-scheme --- strontium aluminates --- dye photodecomposition --- hydrothermal reaction --- sol–gel method --- phosphorescence --- photocatalytic decomposition of rhodamine B --- MIL-53(Fe) --- Ni/Fe-MOF --- visible light irradiation --- n/a

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solar energy conversion --- n/a --- carboxylic acid --- organic salts --- 2?:6? --- Cerium --- drug delivery --- layered materials --- coordination polymer --- copper --- solid state NMR --- metal–organic frameworks --- synthesis --- coordination polymers --- in situ characterisation --- mechanochemistry --- phosphonic acids --- amorphous --- nickel(II) oxide --- heterogeneous catalysis --- phosphonic acid --- MOF --- porosity --- phosphonate ester --- proton conduction --- X-ray and electron diffraction --- gas sorption/separation --- metal phosphonate --- electron diffraction tomography --- ionic compounds --- dye-sensitized solar cell --- 2?-terpyridine --- dye --- 2 --- rechargeable batteries --- anchor --- defects --- p-type --- crystal structure --- diphosphinate --- zinc(II) --- metal phosphonates and phosphinates --- metal-organic frameworks

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A collection of essential research articles and scientific reviews covering some of the most pertinent and topical areas of study that currently constitute Inorganic Chemistry in the early 21st century.

Research & information: general --- Chemistry --- Inorganic chemistry --- cyanoguanidine --- silver --- crystal structure --- chemical bonding --- CuII --- pyridine amides --- pyrazine amide --- amino benzamides --- EPR spectroscopy --- lanthanides --- Schiff base --- synthetic strategies --- single-molecule magnets --- Atomic Layer Deposition --- Ni catalyst --- reforming catalyst --- thermodynamics --- metallopharmaceuticals --- cancer stem cells --- copper --- bioinorganic chemistry --- medicinal inorganic chemistry --- reactive oxygen species --- metal-carbonyl complexes --- [FeFe]-hydrogenases --- density functional theory --- time-dependent DFT --- organometallic photochemistry --- crystalline borosilicate --- actinides --- supercritical hydrothermal synthesis --- waste forms --- thorium --- rhenium --- ruthenium --- metal–metal bonds --- uranium --- ceria --- hydrothermal --- catalysis --- nanomaterials --- crystallisation --- 4,2′:6′,4″-terpyridine --- 3,2′:6′,3″-terpyridine --- coordination polymer --- isomers --- lithium --- potassium --- Nacnac --- β-diketiminate --- tricyclohexylphenyl --- steric bulk --- silver complexes --- permanganates --- perchlorates --- perrhenate --- pyridine --- structure --- spectroscopy --- thermal behavior --- heterogenous catalyst --- metal–organic framework (MOF) --- olefin epoxidation --- carbon dioxide cycloaddition --- f-element --- lanthanide --- actinide --- multidentate ligand --- macrocycle --- ammonothermal synthesis --- fluoride --- aluminum --- speciation --- equilibria --- thermodynamic stability --- peptides --- multivariate linear regression --- poisoning effect of polar monomers --- Brookhart-type catalysts --- Zintl clusters --- X-ray crystallography --- Density Functional Theory --- n/a --- metal-metal bonds --- 4,2':6',4"-terpyridine --- 3,2':6',3"-terpyridine --- metal-organic framework (MOF)