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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Supramolecular coordination complexes --- Metallacages --- helicates --- Anticancer agents --- host-guest chemistry --- Drug delivery --- Antibacterial Agents --- Supramolecular coordination complexes --- Metallacages --- helicates --- Anticancer agents --- host-guest chemistry --- Drug delivery --- Antibacterial Agents

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The book compiles scientific articles describing advances in nanomaterial synthesis and their application in water remediation. The publications treat diverse problems such as dye degradation, heavy metal ion, as well as radioactive element capture and sequestration. There are 10 original research articles and one review article. The latter proposes graphene/CNT and Prussian blue nanocomposites for radioactive 137-cesium extraction from aqueous media. All reports thoroughly characterize the nanomaterials post-synthesis and describe their catalytic, photocatalytic, or ion exchange activities in contaminated water. The dyes studied in the collection are azo dyes, i.e. methylene blue and orange, rhodamine B, phenolic dyes viz. bromophenol blue, and other dyes with sulfonyl groups. Extraction of radioactive elements, including cationic 137Cs+ and anionic 125I?, is also investigated. The omnipresence of ZnO nanoparticles in everyday products and their effects in wastewater are also evaluated. Layered double hydroxide are capable of capturing Ag ions, which then has a catalytic effect on dye degradation. The nanomaterials considered are varied, viz., graphene, CNT, Prussian blue, nanoporous carbon, layered double hydroxides, magnetite, ferrites, organic powders, polymer membranes, bacteria, and inorganic nanomaterials such as MnO and Ag. The book targets an interdisciplinary readership.

LDHs --- magnetic photocatalyst --- n/a --- bioremediation --- membrane --- BiOCl --- BiVO4 --- degradation --- agglomeration --- solvent vapor annealing --- nanoporous carbon --- nanocomposite --- Prussian blue --- stability --- silver nanomaterials --- adsorption --- wastewater --- desalination --- ZnO nanoparticles --- film --- magnetic performance --- metal-organic frameworks --- 137Cs+ selectivity --- nanomixtures --- water remediation --- photocatalytic activity --- adsorption properties --- magnetic extraction --- RGO --- structural regularity --- photocatalytic mechanism --- wastewater treatment --- 137-Cesium --- photocatalyst --- magnetic nanoparticles --- graphene --- radioactive iodine --- carbon nanotubes --- doping modification --- electrospinning --- radioactive contamination --- Mn–Zn ferrite --- mixed wastewater --- manganese oxide --- host–guest interaction --- bromophenol blue --- Dy3+ --- organic pollutants --- dye --- beta-cyclodextrin polymer --- polydopamine --- interaction --- dye removal --- adsorption models --- RhB photodegradation --- hydrothermal method --- supercapacitor --- Mn-Zn ferrite --- host-guest interaction

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With pore sizes up to 100 nm, the term "nanoporous" covers a wide range of material classes. A broad field of applications has arisen from the diversity of unique structures and properties of nanoporous materials. Recent research spans the range from fundamental studies of the behavior of atoms and molecules in confined space, creative synthetic pathways for novel materials, to applications in high-performance technologies. This Special Issue collects current studies about the progress in the development, characterization, and application of nanoporous materials, including (but not restricted to) mesoporous silica, carbon and metal oxides, porous coordination polymers, metal organic frameworks (MOFs), and covalent organic frameworks (COFs), as well as materials exhibiting hierarchical porosity. Their functionalities show promise for fields such as energy storage/conversion (e.g., photocatalysis and battery electrodes), sensing, catalysis, and their sorption properties for N2, CO2, NOx, or H2O, to name just a few.

mesoporous silica --- organocatalysis --- host–guest materials --- magic-angle spinning NMR (MAS-NMR) --- nanoporous metal foam --- nanoshell --- buckling --- free vibration --- strain gradient theory --- first-order shear deformation theory --- SERS --- near-infrared --- crystal silicon photoluminescence --- porous silicon photonic crystals --- hot-spots --- mesoporous films --- direct growth --- esterification --- material formation --- porous organic polymers --- amine modification --- CO2 separation --- adsorption mechanism --- chemisorption of CO2 --- Birnessite --- nanoporous metal oxides --- impedance spectroscopy --- perovskite solar cell --- electron selective layer --- pinhole --- mesoporous TiO2 --- evaporation-induced self-assembly --- dip coating --- n/a --- host-guest materials

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This Special Issue is one of the first for the new MDPI flagship journal Chemistry (ISSN 2624-8549) which has a broad remit for publishing original research in all areas of chemistry. The theme of this issue is Supramolecular Chemistry in the 3rd Millennium and I am sure that this topic will attract many exciting contributions. We chose this topic because it encompasses the unity of contemporary pluridisciplinary science, in which organic, inorganic, physical and theoretical chemists work together with molecular biologists and physicists to develop a systems-level understanding of molecular interactions. The description of supramolecular chemistry as ‘chemistry beyond the molecule’ (Jean-Marie Lehn, Nobel Lecture and Gautam R. Desiraju, Nature, 2001, 412, 397) addresses the wide variety of weak, non-covalent interactions that are the basis for the assembly of supramolecular architectures, molecular receptors and molecular recognition, programed molecular systems, dynamic combinatorial libraries, coordination networks and functional supramolecular materials. We welcome submissions from all disciplines involved in this exciting and evolving area of science.

Technology: general issues --- anion binding --- chloride receptor --- switchable system --- hydroquinone --- redox switch --- metal-organic frameworks --- vapour sorption --- solvatochromism --- desorption kinetics --- ion-channels --- crown-ethers --- bilayer membranes --- self-assembly --- supramolecular chemistry --- host–guest chemistry --- coordination cage --- catalysis --- crystal structure --- copper chloride complexes --- H-bonding pattern --- tetrazole ligands --- X-ray diffraction --- Hirshfeld surfaces --- uranium(VI) --- carboxylates --- capsules --- structure --- luminescence --- multicomponent cocrystal --- cocrystallization mechanism --- cocrystal synthesis --- crystal engineering --- porous material --- molecular recognition --- halogen bond --- co-crystal --- molecular tecton --- binary solid --- network structure --- σ-hole --- molecular electrostatic potential --- calixarenes --- coordination clusters --- manganese --- molecular magnetism --- host–guest interaction --- cucurbit[7]uril --- 4-pyrrolidinopyridinium --- copper complexes --- chlorido ligand displacement --- catalysis regulation --- Schiff base ligands --- urea hydrolysis --- coordination chemistry --- hydrogen bonds --- metalla-assemblies --- coordination-driven self-assembly --- orthogonality --- ligands --- metal ions --- complementarity --- hydrogen bonding --- cyclotricatechylene --- metal–organic cage --- helicate --- metallosupramolecular --- chirality --- copper(II) complexes --- pyrazolato ligands --- supramolecular assembly --- X-ray crystallography --- magnetic susceptibility --- EPR spectroscopy --- isotropic exchange --- antisymmetric exchange --- dipolar interaction --- DFT calculations --- hydrogen bond --- pyrazine --- chloropyrazine --- chloropyrazin-2-amine --- copper halide --- supramolecular structure --- conformational polymorphism --- intermolecular contacts --- N,N′,N″,N‴-Tetraisopropylpyrophosphoramide --- pyrophosphoramide --- synthons --- supramolecular motifs --- n/a --- host-guest chemistry --- host-guest interaction --- metal-organic cage --- N,N',N",N‴-Tetraisopropylpyrophosphoramide

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A growing interest has been devoted to the development of host systems for ionic and neutral species based on calixarenes. These cyclic oligomers show important host–guest properties, which has led to numerous applications in a broad range of fields, including organocatalysis, sensing, extraction and separation, and, more recently, biomedical applications. The relative ease of the functionalization of their upper and lower rims and the presence of a pre-organized cavity that is available in different sizes and conformations make calixarenes attractive building blocks for the construction of supramolecular assemblies. This book presents the most recent developments on the host–guest properties of calixarenes, as well as the new synthetic methods and applications.

Research & information: general --- thiosemicarbazone --- calix[4]arene --- metal complex --- X-ray structure --- antimicrobial --- anticancer --- copper --- supramolecular --- inclusion complex --- fluorescence --- sensor --- density functional theory --- calix[3]arenes --- metacyclophanes --- calixarene-analogous metacyclophanes --- inherent chirality --- host-guest chemistry --- dihomooxacalix[4]arenes --- naphthyl(thio)urea anion receptors --- alkylammonium hydrochlorides --- ditopic receptors --- chiral recognition --- NMR studies --- UV-Vis absorption studies --- fluorescence studies --- X-ray diffraction --- DFT calculations --- calixarene --- resorcinarene --- pillararene --- antibiotic --- fungicide --- biofilm inhibition --- calixarenes --- threading --- chirality --- barfate salts --- pseudorotaxane --- chiral axles --- chiral wheels. --- calixarene-like structure --- polyoxometalates --- nitronate --- crystal structure --- host–guest chemistry --- anion receptor --- anion --- sensors --- lanthanides --- UV–vis studies --- quantum yields --- lifetime measurements --- noncovalent synthesis --- hierarchical control --- calix[4]tubes --- metallo-porphyrins --- phthalimide derivatives --- conventional synthesis --- microwave irradiation --- ball milling --- NMR spectroscopy --- electronic absorption and fluorescence studies