Chemie.de - Seite 25

Homepage  Xml - Vorschau mit Bildern

High contrast mechanochromic and thermochromic luminescence switching by a deep red emitting organic crystal
In this study, we report a deep red emissive organic crystal that displays high contrast fluorescence switching under mechanical- and thermal stimulation. Upon mechanical grinding, the pristine red emissive crystals of 1R (λem = 667 nm) transformed to green emissive crystalline powder (λem = 550 nm)...

Effects of diminished steric protection at phosphorus on stability and reactivity of oxaphosphirane complexes
Readily available P-tBu substituted Li/Cl phosphinidenoid complexes react with carbonyl compounds to furnish sterically almost unhindered oxaphosphirane complexes that reveal new and surprisingly facile intra- and intermolecular ring expansion reactions. 1,3,2-Dioxaphosphole complex formation is exp...

Phase separation in binary mixtures of active and passive particles
We study binary mixtures of small active and big passive athermal particles interacting via soft repulsive forces on a frictional substrate. Athermal self propelled particles are known to phase separate into a dense aggregate and a dilute gas-like phase at fairly low packing fractions. Known as {\em...

Improved MOF nanoparticle recovery and purification using crosslinked PVDF membranes
Crosslinked PVDF-membranes are demonstrated to offer a viable alternative for centrifugation in the preparation of MOF-particles, thus realising new opportunities at lab-scale and continuous production at large-scale. The membranes combine extreme-pH with solvent stability, thus enabling application...

Mixed-valence dimolybdenum complexes containing hard oxo and soft carbonyl ligands: Synthesis, structure, and electrochemistry of Mo2(O)(CO)2([small mu ]-?2-S(CH2)nS)2(?2-diphosphine)
Mixed-valence dimolybdenum complexes Mo2(O)(CO)2{μ-к2-S(CH2)nS}2(к2-Ph2P(CH2)mPPh2) (n=2,3; m=1,2) (1-4) have been synthesized from one-pot reactions of fac Mo(CO)3(NCMe)3 and dithiols, HS(CH2)nSH, in the presence of diphosphines. The dimolybdenum framework is supported by two thiolate bridges, with...

Small molecule activation with divalent samarium triflate: a synergistic effort to cleave O2
The divalent samarium triflate salt does not react with CO2 or water, but does react with traces of O2 or N2O to form a tetrameric bis-oxo samarium motif. The reaction with O2 is a 4e− reductive cleavage where the electrons are coming from four different samarium centers. This highlights a rare syne...

Room Temperature Synthesis of Aqueous Soluble Covellite CuS Nanocrystals with High Photothermal Conversion
Near-infrared plasmonic binary copper-based chalcogenides have found promising applications in photovoltaics and photothermal therapy. Here, we report a facile synthetic protocol for aqueous soluble covellite (CuS) nanocrystals (NCs) at room temperature. In contrast to previously reported routes, th...

Secondary dialkylammonium salt/crown ether [2]pseudorotaxanes as nanostructuring platforms for proton transport
As connected by multivalent secondary dialkylammonium salt/crown ether [2]pseudorotaxanes, supramolecular polymer networks have been obtained by mixing surfactant-encapsulated clusters with dibenzo[24]crown-8 groups and star polymers end functionalized with dibenzylammonium ions. This picture induce...

Capacity fading mechanism of tin phosphide anodes in sodium-ion batteries
Tin phosphide (Sn4P3) is here investigated as an anode material in half-cell, symmetrical, and full-cell sodium-ion batteries. Results from the half-cells using two different electrolyte salts of that sodium bis(fluorosulfonyl)imide (NaFSI) or sodium hexafluorophosphate (NaPF6) show that NaFSI provi...

Increasing the ion-exchange capacity of MFI zeolites by introducing Zn to the aluminosilicate frameworks
MFI Zeolites exchanged with various cations have gained a great deal of attention as catalysts. Increase in the ion-exchange capacity of zeolites can improve their catalytic properties by introducing more active sites; however, the ion-exchange capacity of MFI zeolites is limited by maximum aluminum...

Iron(II) complexes of tris(2-pyridylmethyl)amine (TPMA) and neutral bidentate ligands showing thermal- and photo-induced spin crossover
Three new mononuclear Fe(ii) complexes have been prepared and characterized by the combination of tetradentate tris(2-pyridylmethyl)amine (TPMA) with three neutral bidentate ligands, such as ethylenediamine (en), 1,2-diaminopropane (pn) and 2-picolylamine (2-pic), in compounds [FeII(TPMA)(en)](ClO4)...

DFT Investigation on the Adsorption of Munition Compounds on [small alpha]-Fe2O3: Similarity and Differences with [small alpha]-Al2O3
Arid environments have long been a testing and training ground for novel munitions. However, these activities leave behind unknown quantities of munition residues with unknown impact on local flora and fauna. In particular, arid soil contains Lewis acidic metal oxides which bind and catalyze the ele...

Transpeptidation-Directed Intramolecular Bipartite Tetracysteine Display for Sortase Activity Assay
We developed a label-free method to measure Sortase activity by using transpeptidation-directed intramolecular bipartite tetracysteine display. This assay is homogenous with a detection limit of 10.7 ng/mL, and it can be applied to characterize the Sortase A (SrtA)-targeted inhibitor, providing a ne...

Development of Trapezoidal MgO Catalyst for High-Efficient Transesterification of Glycerol and Dimethyl Carbonate
A series of micro-sized MgO with various morphologies have been prepared by varying the reaction temperature and stirring time during precipitation, and were investigated for the production of glycerol carbonate from the transesterification of glycerol with dimethyl carbonate. In contrast to other m...

Rhodium-catalyzed oxidative CH/CH cross-coupling of aniline with heteroarene: N-nitroso group enabled mild conditions
The development of transition metal-catalyzed oxidative C–H/C–H cross-coupling between two (hetero)arenes to forge aryl-heteroaryl motifs under mild conditions is an appealing yet challenging task. Herein, we disclose a rhodium-catalyzed oxidative C–H/C–H cross-coupling reaction of an N-nitrosoanili...


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36