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PubMed Journal Database | Inorganic chemistry RSS

07:56 EDT 26th May 2019 | BioPortfolio

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Showing PubMed Articles 1–25 of 2,100+ from Inorganic chemistry

Multifunctional Optical Thermometry Based on the Rare-Earth-Ions-Doped Up-/Down-Conversion BaTiGeO:Ln (Ln = Eu/ Er/ Ho/ Yb) Phosphors.

The fabrication of a multifunctional sensor together with a widening temperature-sensing range is an essential challenge in optical thermometers especially for trivalent lanthanide-doped materials. Herein, we design a wide range, highly sensitive, and multifunctional thermometer by exploiting the emission spectrum of Eu ions, and further detailed discussion has been made on the new temperature-sensing mechanism. The sensor can be operated between 358 and 548 K with a maximum relative sensitivity ( S) of 0.9...

A Series of Quinolinol-Based Indium Luminophores: A Rational Design Approach for Manipulating Photophysical Properties.

An approach to the design of a series of quinolinol-based indium complexes that can exhibit different optical properties is proposed. Mono-incorporated (Inq and InMeq), bis-incorporated (InMeq), and tris-incorporated (Inq and InMeq) indium quinolinate complexes have been prepared. These complexes have also been characterized by X-ray crystallography. The photophysical properties of these complexes have also been examined by a combination of experimental and theoretical techniques. The indium complexes with ...

BeCOF Monolayer: A Flexible Ultraviolet Nonlinear Optical Material via Rational Design.

Multifunctional monolayer materials with attractive properties and novel applications are of present research interest. In this contribution, we design a new monolayer BeCOF (BCF) by taking a KBeBOF unique crystal that is able to produce a high energetic laser by a direct second harmonic generation method, as a parent. The cohesive energy, positive phonon modes, and elastic constants reveal that the BCF monolayer is dynamically and mechanically stable, and the appropriate cleavage energy predicts the experi...

Redox Tuning via Ligand-Induced Geometric Distortions at a YMnO Cubane Model of the Biological Oxygen Evolving Complex.

The function of proteins involved in electron transfer is dependent on cofactors attaining the necessary reduction potentials. We establish a mode of cluster redox tuning through steric pressure on a synthetic model related to Photosystem II. Resembling the cuboidal [CaMnO] subsite of the biological oxygen evolving complex (OEC), [MnO] and [YMnO] complexes featuring ligands of different basicity and chelating properties were characterized by cyclic voltammetry. In the absence of ligand-induced distortions, ...

A Smart Photosensitizer-Cerium Oxide Nanoprobe for Highly Selective and Efficient Photodynamic Therapy.

Cerium oxide (CeO ) with a reversible surface Ce/Ce redox pair has played an important role in catalytic reactions, whereas catalase mimetics of CeO have attracted little attention in the field of biotherapy. Herein, a smart photosensitizer-cerium oxide nanoprobe was developed to represent a promising paradigm in high-performance photodynamic therapy. The photosensitizer was linked to CeO nanoparticles through a substrate peptide (EGPLGVRGK) of matrix metalloproteinase-2 (MMP-2). The smart nanoprobe could...

Nitrite Reduction by Trinuclear Copper Pyrazolate Complexes: An Example of a Catalytic, Synthetic Polynuclear NO Releasing System.

Two trinuclear Cu pyrazolato complexes with a Cu(μ-E)-core (E = O or OH) and terminal nitrite ligands in two coordination modes were characterized crystallographically, spectroscopically, and electrochemically. One-electron oxidation of the μ-O species produces a delocalized, mixed-valent, formally CuCu-nitrite, but no nitrate. In contrast, under reducing conditions-addition of PhSH as an electron and proton donor-both complexes mediate the reduction of nitrite, releasing NO.

A Chiral and Polar Single-Molecule Magnet: Synthesis, Structure, and Tracking of Its Formation Using Mass Spectrometry.

The solvothermal reaction of cobalt(II) sulfate with S, S-1,2- bis(1-methyl-1 H-benzo[ d]imidazol-2-yl)ethane-1,2-diol, (HL), neutralized with triethylamine (EtN) in a mixture of methanol and water (2:1), resulted in triangular red crystals of [Co(L)(SO)(OH)(HO)]·4HO·3CHOH (Co). It is formed of chiral and polar clusters crystallizing in the R space group. Co consists of apex-shared asymmetric dicubane units where all of the metals adopt an octahedral coordination and the three ligands wrap diagonally arou...

Modeling Strain Distribution at the Atomic Level in Doped Ceria Films with Extended X-ray Absorption Fine Structure Spectroscopy.

Ceria doped with trivalent dopants exhibits nonclassical electrostriction, strong anelasticity, and room-temperature (RT) mechanical creep. These phenomena, unexpected for a ceramic material with a large Young's modulus, have been attributed to the generation of local strain in the vicinity of the host Ce cations due to symmetry-breaking point defects, including oxygen vacancies. However, understanding why strain is generated at the host rather than at the dopant site, as well as predicting these effects as...

A Stereoselective Tyrosinase Model Compound Derived from an m-Xylyl-l-histidine Ligand.

The aim of mimicking enzyme activity represents an important motivation for the development of new catalysts. A challenging objective is the development of chiral complexes for bioinspired enantioselective oxidation reactions. Herein, we report a new chiral dinuclear copper(II) complex based on a m-xylyl-bis(histidine) ligand (mXHI) as a biomimetic catalyst for tyrosinase and catechol oxidase. The new ligand improves a previous system also containing two tridentate N3 units derived from l-histidine that wer...

Complexation of Lanthanides with N, N, N', N'-Tetramethylamide Derivatives of Bipyridinedicarboxylic Acid and Phenanthrolinedicarboxylic Acid: Thermodynamics and Coordination Modes.

The thermodynamics of Nd(III) and Eu(III) complexes with N, N, N', N'-tetramethyl-2,2'-bipyridine-6,6'-dicarboxamide (TMBiPDA) and N, N, N', N'-tetramethyl-1,10-phenanthroline-2,9-dicarboxamide (TMPhenDA) in CHOH/10%(v)HO solutions were studied. Stability constants and enthalpies of complexation were determined by absorption spectrophotometry, luminescence, and calorimetry. The stability constants of corresponding lanthanide complexes decrease in the order of TMPhenDA > TMBiPDA, while those of the correspon...

An Ionophore for High Lithium Loading and Selective Capture from Brine.

The continuous demand and uneven dispersal of natural mineral resources of lithium with a low recycling rate of lithium commodities have forced researchers to look for alternative resources like geothermal brine, brackish brines, and sea brines. But selective lithium-ion extraction and even lithium-ion binding from these aqueous systems is a recognized challenge due to very high hydration energy and the coexistence of other like metal ions but appealing due to economic benefits. Therefore, the designed synt...

A Small Lattice Change Induces Significant Dynamic Changes of CHNH Caged in Hybrid Perovskite Crystals: Toward Understanding the Interplay between Host Lattices and Guest Molecules.

Two perovskite-type compounds, (MA)[B'Co(CN)] (MA = methylammonium, B' = K(I) and Na(I)), have very similar structures, but exhibit marked differences in the phase and dielectric transitions. Solid state H NMR studies reveal the detailed dynamic changes of the caged methylammonium (MA) cations before and after the phase transitions, which are correlated with the different dielectric states of the compounds. Using solid state Co NMR, the dynamic changes of the host lattices before and after the transitions, ...

Cobalt Metallogel Interface for Selectively Sensing l-Tryptophan among Essential Amino Acids.

The development of metallogels widens the span of sensing activity as it opens new opportunities to develop chemosensors through metal-ligand interactions. Herein, a new nitrile-substituted 1,3,5-tricarboxamide-based gelator G4 has been fabricated and shows aggregate-induced enhanced emission (AIEE) after gelation in the presence of water. A dimethylformamide (DMF) solution of the gelator shows rapid crystallization, but addition of water to a DMF solution of gelator G4 leads to gelation at room temperature...

Bioinspired Oxidation of Methane in the Confined Spaces of Molecular Cages.

Non-heme iron, vanadium, and copper complexes bearing hemicryptophane cavities were evaluated in the oxidation of methane in water by hydrogen peroxide. According to H nuclear magnetic resonance studies, a hydrophobic hemicryptophane cage accommodates a methane molecule in the proximity of the oxidizing site, leading to an improvement in the efficiency and selectivity for CHOH and CHOOH compared to those of the analogous complexes devoid of a hemicryptophane cage. While copper complexes showed low catalytic...

Stereoelectronic Profiling of Expanded-Ring N-Heterocyclic Carbenes.

Heterobis(carbene) complexes of palladium(II) and gold(I) containing expanded-ring N-heterocyclic carbenes (erNHCs) have been prepared in order to study their electronic properties. erNHCs with mesityl substituents were found to exhibit anisotropic interferences, which hampered ranking of their donicities by C NMR spectroscopy. The anisotropy effects were found to be stronger in the linear gold complexes, where a smaller coordination number allows the wingtips to spread out more. erNHCs with flexible N-benz...

SrLiScBO:Ce/Tb: A Green-Emitting Phosphor with High Energy Transfer Efficiency and Stability for LEDs and FEDs.

Exploring new, efficient, and stable phosphors is important and meaningful work for both LEDs and FEDs. Here, the new Ce/Tb-codoped green-emitting phosphor SrLiScBO with high energy transfer efficiency and outstanding stability was designed and prepared by a solid-state reaction. The phosphors show a broad excitation spectrum in the range of 235-375 nm and a narrow green emission spectrum around 544 nm. The strong Tb emission with weak Ce emission and the decreasing lifetime of Ce indicate that the samples ...

Arousing the Reactive Fe Sites in Pyrite (FeS) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction.

Despite significant advances in the development of highly efficient and robust oxygen evolution reaction (OER) electrocatalysts to replace noble-metal catalysts, commercializing OER catalysts with high catalytic activity for sustainable development still remains a great challenge. Especially, transition-metal Fe-based OER catalysts, despite their earth-abundant, cost-efficient, and environmentally benign superiorities over Co- and Ni-based materials, have received relatively insufficient attention because o...

Low Temperature Nanotailoring of Hydrated Compound by Alcohols: FeF·3HO as an Example. Preparation of Nanosized FeF·0.33HO Cathode Material for Li-Ion Batteries.

Iron fluoride is a kind of high-capacity conversion-type cathode material for lithium-ion batteries (LIBs) and shows attractive practical application potential. However, it still faces many challenges, such as poor electronic conductivity and volume change while cycling. Reducing particle size to nanoscale has been proved to be an effective way to address the poor electronic conductivity and huge volume change of iron fluoride cathodes for LIBs. In this study, a low temperature nanotailoring (LTNT) strategy...

Conductive Nanosized Magnéli-Phase TiO with a Core@Shell Structure.

Magnéli-phase TiO, known for its high electrical conductivity and corrosion resistance, is typically prepared by hydrogen reduction at high temperatures (∼1000 °C), leading to large particles. Nanosized TiO have been explored for application toward high specific surface area electrode materials and electrocatalyst supports; nonetheless, the particle size of TiO is still insufficient for utilization as a support. In this study, we have pursued a novel synthetic approach for nanosized TiO platelets with a...

Stereochemically Active and Inactive Lone Pairs in Two Room-Temperature Phosphorescence Coordination Polymers of Pb with Different Tricarboxylic Acids.

Two new Pb-based coordination polymers (CPs), [Pb(HBTC)(DMF)] (1) and [Pb(HPTC)] (2), have been synthesized under solvothermal condition; herein, HBTC and HPTC represent 1,3,5-benzenetricarboxylic acid and 2,4,6-pyridine tricarboxylic acid, respectively. Both 1 and 2 were characterized by microanalysis, infrared spectra (IR), thermal gravimetric analyses (TGA), and powder X-ray diffraction (PXRD) techniques. Single-crystal structural analysis indicates that 1 and 2 show different coordination sphere around ...

Evaluating DNA Derived and Hydrothermally Aided Cobalt Selenide Catalysts for Electrocatalytic Water Oxidation.

Electrocatalysts with engaging oxygen evolution reaction (OER) activity with lesser overpotentials are highly desired to have increased cell efficiency. In this work, cobalt selenide catalysts were prepared utilizing both wet-chemical route (CoSe and CoSe-DNA) and hydrothermal route (CoSe-hyd). In wet-chemical route, cobalt selenide is prepared with DNA (CoSe-DNA) and without DNA (CoSe). The morphological results in the wet-chemical route had given a clear picture that, with the assistance of DNA, cobalt se...

An Alkali Metal Ion-Exchanged Metal-Phosphate (CHN) NaMn(PO) with High Proton Conductivity of 10 S·cm.

A two-dimensional layered inorganic-organic hybrid metal hydrogenophosphate (1) was treated with 0.1 M NaOH-ethanol solution, which resulted in a Na-ion substitution product that exhibits excellent thermal and aqueous stability with 1, as well as much higher proton conductivity (σ = 10 S·cm) even at low temperature (283 K). This is because Na ions in aqueous solution make a more dense and extensive H-bonding network of water molecules, which enables protons to more easily transfer along the network.

Role of Hydrogen Bonding by Thiones in Protecting Biomolecules from Copper(I)-Mediated Oxidative Damage.

The sulfur-containing antioxidant molecule ergothioneine with an ability to protect metalloenzymes from reactive oxygen species (ROS) has attracted significant interest in both chemistry and biology. Herein, we demonstrated the importance of hydrogen bonding in S-oxygenation reactions between various thiones and HO and its significance in protecting the metal ion from HO-mediated oxidation. Among all imidazole- and benzimidazole-based thiones (1-10), ImS (2) showed the highest reactivity toward HO-almost 10...

Morphology-Directed Synthesis of LiFePO and LiCoPO from Nanostructured LiPO.

A LiPO-type nanostructure has been developed using a simple microwave approach at temperatures as low as 200 °C. This phase presents an ideal architecture for the morphology-directed synthesis of the olivine-type phases LiFePO and LiCoPO, through a simple and scalable solution-based technique. Pure and carbon-composited olivine phases of interconnected nanoparticulate morphologies display excellent performance at high rates (up to 20 C) over 500 cycles in Li-ion battery cells.

Synthesis, Structure, and Characterization of Two Mixed-Cation Quaternary Chalcogenides KBaSnQ (Q = S, Se).

Two new isostructural metal chalcogenides, KBaSnS and KBaSnSe, have been isolated for the first time. They feature the intriguing ∞ 1[BaSnQ] (Q = S, Se) tunnel structures which are separated by K cations. Experiments combined with theoretical calculations demonstrate that KBaSnS possesses a large energy gap (3.09 eV), which is conducive for large laser-induced damage thresholds (LDTs), and maintains a relatively moderate SHG response (0.5 × AgGaS) in the meanwhile. Moreover, KBaSnS possesses good phase-m...


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