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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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This book represents a collection of contributions in the field of the synthesis and characterization of chemical compounds, natural products, chemical reactivity, and computational chemistry. Among its contents, the reader will find high-quality, peer-reviewed research and review articles that were published in the open access journal Compounds by members of the Editorial Board and the authors invited by the Editorial Office and Editor-in-Chief.

Technology: general issues --- Chemical engineering --- atropisomerism --- 4,4′-bipyridine --- pyridine N-oxidation --- halogenation --- halogen bond --- cyanation --- Finkelstein reaction --- Suzuki coupling --- Orchis --- scent --- gas chromatography --- mass spectrometry --- solid-phase microextraction --- quantum chemistry --- computational chemistry --- molecular dynamics --- modeling --- open-source software --- proprietary software --- Himantoglossum --- solid phase microextraction --- iodination --- alkanes --- alkenes --- alkynes --- alkyl carbonyls --- elemental iodine --- iodides --- Zutano variety --- avocado oil --- Soxhlet extraction --- ultrasound-assisted extraction --- volatiles --- ripening --- over-ripe --- HS-SPME–GC–MS --- Basilicata --- Barlia robertiana --- Himantoglossum robertianum --- mantel test --- Orchidaceae --- pollination syndrome --- Italy --- volatile compounds --- solvolysis --- aryldiazonium ions --- perchlorate anions --- silicon carbide (SiC) --- 3C-SiC powder --- 4H-SiC crystal --- impurities --- photoluminescence --- pnictogen bonding --- nitrogen as pnictogen bond donor --- geometries --- crystal structure analysis --- ICSD and CSD database analyses --- MESP characterizations --- sum of the van der Waals radii concept --- Dactylorhiza --- volatile organic compounds --- thiosemicarbazone --- metal complexes --- DNA interactions --- biological activity --- thiazolidinedione --- microwave synthesis --- compound library --- rosiglitazone --- Knoevangel condensation --- biodiesel production --- crude glycerin --- carbon materials --- n/a --- 4,4'-bipyridine --- HS-SPME-GC-MS

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This collection of articles focuses on different aspects of the study of organic conductors. Recent progress in both theoretical and experimental studies is covered in this Special Issue. Papers on a wide variety of studies are categorized into representative topics of chemistry and physics. Besides classical studies on the crystalline organic conductors, applied studies on semiconducting thin films and a number of new topics shared with inorganic materials are also discussed.

organic π-radical --- molecular conductor --- phthalocyanine --- three-dimensional network --- three-dimensional electronic system --- organic conductors --- bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) --- bis(ethylenediseleno)tetrathiafulvalene (BEST) --- bis(ethylenedithio)tetraselenafulvalene (BETS) --- electrical resistivity --- magnetic susceptibility --- X-ray analysis --- charge-ordered state --- quantum chemical calculations --- Madelung energy --- magnetic property --- reversible transformation --- spin ladder --- nodal line semimetal --- single-component molecular conductor --- conductivity --- DOS --- tight-binding model --- interacting electrons in one dimension --- electronic and lattice instabilities --- renormalization group method --- X-ray diffraction --- single crystal --- electron density --- molecular orbital --- single-component molecular conductors --- extended-TTF dithiolate ligands --- gold dithiolate complexes --- (BETS)2Fe1−xGaxCl4 --- π-d interaction --- NMR --- charge glass --- heat capacity --- electric current --- electric voltage --- Boson peak --- chirality --- tetrathiafulvalene --- crystal structures --- band structure calculations --- hydrogen bonding --- charge-transfer salts --- (TMTTF)2X --- deuteration --- anions --- charge transport --- tunnel junction --- MOCVD --- quantum well --- co-doping --- solar cells --- (TMTSF)8(I3)5 --- (TMTSF)5(I3)2 --- (TMTSF)4(I3)4·THF --- organic conductor --- crystal structure --- high pressure --- DFT --- MP2 --- organic superconductors --- Beechgard salts --- Maxwell-Garnett approximation --- high-Tc --- pressure effect --- Dirac electron system --- resistivity --- magnetoresistance --- synchrotron X-ray diffraction --- band calculation --- correlated electron materials --- layered organic conductor --- unconventional superconductivity --- vortex dynamics --- d-wave pairing symmetry --- superconducting gap structure --- magnetic field --- flux-flow resistivity --- charge-ordered insulator --- electric double layer transistor --- organic field-effect transistor --- π–d system --- Mott insulator --- strongly correlated electron system --- multiferroic --- dielectric --- photoconductor --- organic semiconductors --- molecular orbitals --- pyroelectricity --- temperature modulation --- molecular ferroelectrics --- radiative temperature control --- thermal diffusion model --- lithium niobate --- first-principles calculation --- density-functional theory --- charge ordering --- hybrid functional --- electronic structure --- nickel–dithiolene complex --- cycloalkane substituent --- crystalline organic charge-transfer complexes --- disordered systems --- overlap integrals --- extended Hückel approximation --- Dirac electrons --- zero-gap semiconductors --- merging of Dirac cones --- n/a --- π-d system --- nickel-dithiolene complex --- extended Hückel approximation