Chemie.de - Seite 28

Homepage  Xml - Vorschau mit Bildern

Iron(II) coordination polymer catalysed hydroboration of ketones
Catalytic hydroboration of ketones with pinacolborane was achieved by a 2D iron(II) coordination polymer (CP) of a divergent 4,2′;6′,4′′-terpyridine(tpy) derivative under mild conditions with high efficiency. This solid iron catalyst system is more active towards hydroboration of ketones than aldehy...

Different bending models predict different dynamics of sedimenting elastic trumbbells
The main goal of this paper is to examine theoretically and numerically the impact of a chosen bending model on dynamics of elastic filaments settling in a viscous fluid under gravity at low-Reynolds-number. We use the bead-spring approximation of a filament and Rotne-Prager mobility matrix to descr...

In situ atomic-scale observation of inhomogeneous oxide reduction
We report in situ atomic-scale transmission electron microscopy observations of the surface dynamics during Cu2O reduction. We show inhomogeneous oxide reduction caused by the preferential adsorption of hydrogen at step edges that induces oxygen loss and destabilizes Cu atoms within the step edge, t...

A well-grown [small beta]-Ga2O3 microrods array transformed by GaOOH on Si (100) substrate and growth mechanism study
Simple two step hydrothermal methods are introduced to succefully fabricate the well-grown β-Ga2O3 microrods array converted by GaOOH on Si (100) substrate without other heterogeneous layers, which overcome the relatively large surface energy. Different hydrothermal conditions are designed to invest...

A fluorometric skin-interfaced microfluidic device and smartphone imaging module for in situ quantitative analysis of sweat chemistry
The rich composition of solutes and metabolites in sweat and its relative ease of collection upon excretion from skin pores make this class of biofluid an attractive candidate for point of care analysis. Wearable technologies that combine electrochemical sensors with conventional or emerging semicon...

Directed ortho C-H borylation catalyzed by Cp*Rh(III)-NHC complex
Cp*Rh(NHC) complexes with bulky chiral bidentate NHC-carboxylate ligands were efficiently synthesized and fully characterized including solid-state structures. The new complexes demonstrated high selectivity in the pyridine-directed ortho-C-H borylation of arenes under mild conditions....

Tetranuclear and dinuclear phenoxido bridged copper complexes based on unsymmetrical thiosemicarbazone ligands
We report on the synthesis of new dinucleating phenol-based “end-off” compartmental ligands HLMeH and HLMe2 bearing two different binding sites, one bis(2-methylpyridyl)aminomethyl (BPA) and one thiosemicarbazone (TSC) site, and their corresponding copper(II) complexes 1t and 2d. With the ligand HLM...

Synthesis and structure of arylselenium(II) and aryltellurium(II) cations based on rigid 5-tert-butyl-1,3-bis-(N-pentylbenzimidazol-2[prime or minute]-yl)benzenes
The transmetalation reactions of a mercury precursor, [Pentyl(N^C^N)HgCl] (19), with selenium halides (SeCl4, SeBr4, and SeCl2) were attempted to obtain the corresponding organoselenium trichloride [Pentyl(N^C^N)SeCl3], tribromide [Pentyl(N^C^N)SeBr3], and monochloride [Pentyl(N^C^N)SeCl], respectiv...

Solar UV radiation and microbial life in the atmosphere
Many microorganisms are alive while suspended in the atmosphere, and some seem to be metabolically active during their time there. One of the most important factors threatening their life and activity is solar ultraviolet (UV) radiation. Quantitative understanding of the spatial and temporal surviva...

Dual-Functional Cyclic Peptide Switch on Mesoporous Nanocontainers for Selective CD44 Targeting and On-Off Gatekeeping Triggered by Conformational Transformation
Cyclic peptide gatekeepers with a capability of on-off drug release triggered by stimuli-responsive conformational transformation on the surface of mesoporous silica nanocontainers (MSNs) has several advantages such as facile introduction of targeting ligand, high targeting selectivity, and low enzy...

Syntheses, Crystal-Solution Structures and Magnetic Properties of a Series of Decanuclear Heterometallic [LnIII2CoII4CoIII4] (Ln= Eu, Gd, Tb, Dy) Clusters
Four unprecedented decanuclear heterometallic [Ln2CoII4CoIII4] clusters based on diethanolamine ligand (H2dea), namely [Eu2CoII4CoIII4(dea)8(HCOO)4(OH)2(Cl)2(CH3OH)2]Cl2•4CH3OH•2H2O (1) , [Gd2CoII4CoIII4(dea)8(HCOO)4(OH)2(Cl)2(CH3OH)2]Cl2•4CH3OH•2H2O (2), [Tb2CoII4CoIII4(dea)8(HCOO)4(OH)2(Cl)2(CH3OH...

A ratiometric fluorescent hydrogen peroxide chemosensor manipulated by ICT-activated FRET mechanism and its bioimaging application in living cells and zebrafish
A H2O2-responsive fluorescence chemosensor (CNBE) with ratiometric emission signal was elaborately designed and synthesized. The ratio signal of chemosensor was manipulated by interplaying ICT-activated FRET mechanism. The ratiometric fluorescent imaging was successfully applied to detect H2O2 using...

Pyrenyl substituted 1,8-naphthalimide as a new material for weak efficiency-roll-off red OLEDs: a theoretical and experimental study
Based on the theoretical calculations of excited states and semiconducting properties, a new 1,8-naphthalimide derivative having an electron-donating 1-pyrenyl group at the C-4 position was designed and synthesized. This derivative exhibited an excellent thermal stability and bipolar charge carrier ...

High selectivity of CO2 hydrogenation to CO by controlling the valence state of nickel using perovskite
The selectivity of CO2 hydrogenation can be significantly tuned by controlling the valence state of nickel using lanthanum–iron–nickel perovskites. Nickel with higher valence states weakens the binding of CO and increases the activation barrier for further CO hydrogenation, leading to a higher CO se...

Direct Metal-free, Base Catalysed sp2 C-H Functionalization in Sulfonamidation of 1,4-Naphthoquinones Using Sulfonyl azides
A novel metal-free, base catalysed sp2 C-H functionalization in the sulfonyl amidation of 1,4-naphthoquinones via a [3+2] cycloaddition reaction using sulfonyl azides under mild reaction conditions is reported. In this straightforward, atom- and step-economical protocol, the active alkene moiety of ...


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