Synthesis, structure, spectral and luminescence studies of novel guanidinium aryl(oxy)(sulfanyl)(sulfonyl)acetates.

A series of promising luminescent materials, nonlinear optical crystals, and physiologically active compounds - aryl(oxy)(sulfanyl)(sulfonyl)acetates of guanidine (A) of unknown type was synthesized. Various functional groups present in (A) were identified using FTIR spectroscopy. H and C NMR spectral studies further confirm the molecular structure (A).

The increase of europium-based OLED luminance through reducing the excited state lifetime by mixed-ligand complex formation.

An approach to the luminance increase of the europium-based OLED is proposed through the formation of the mixed-ligand complex. The introduction of two diverse anionic ligands around one europium ion forming a mixed-ligand complex is confirmed by powder X-ray diffraction, H and F NMR spectroscopy, MALDI MS spectroscopy, and luminescence spectroscopy. A decrease in the symmetry of the coordination environment leads to a 50% reduction of the lifetime of the excited state.

Marine Plankton during the Polar Night: Environmental Predictors of Spatial Variability.

We studied the spatial patterns of the planktonic ecosystems at two Arctic sites strongly affected by Atlantic Inflow (FS, the Fram Strait; and BS, the Barents Sea). A high degree of similarity in the bacterial abundance (mean: 3.1 × 10 cells mL in FS vs.

Diastereoselective synthesis of tetrahydropyrrolo[1,2-]oxadiazoles from functionalized Δ-pyrrolines and generated nitrile oxides.

Tetrahydropyrrolo[1,2-]oxadiazoles have been synthesized in good-to-excellent yields the cycloaddition of nitrile oxides ( generated from aldoximes) to readily accessible functionalized Δ-pyrrolines. The reaction proceeds smoothly at room temperature in a two-phase system in the presence of sodium hypochloride as an oxidant to diastereoselectively afford pharmaceutically prospective 1,2,4-oxadiazolines fused with a five-membered ring. The reaction tolerates a broad range of substrates, including those with oxidant-sensitive functional groups and competitive reaction sites.

Digitization of the electron shell the localized orbital locator formalism: trends in the size and electronegativity changes of atoms across the periodic table.

The parameters of the (3, -3) critical point in the topology of the localized orbital locator inside the electron shell reveal patterns that make it possible to recognize trends in the size, electronegativity, and ionization energy of atoms in the first four periods of the periodic table.