Synthesis and Structure of BaPtIn3 and BaTl0.63In3.33. Two Contrasting Examples of Preferential Site Occupation in BaAl4‐Type Structures

The title compounds have been synthesised by high temperature means and characterized by single crystal X‐ray diffraction analysis. The compounds crystallize in the tetragonal structure type of BaAl₄, I4/mmm, Z = 2 (a = 4.8130(7), 5.0196(8) Å; c = 11.669(2), 11.900(3) Å for BaPtIn₃ and BaTl_0.63In_3.37, respectively).Platinum and thallium randomly substitute for 50 % of the In in the apical 4e and for 30 % in the basal 4d positions in the two networks, respectively. Consistent with both size and relative electronegativity factors, the basal positions in BaAl₄‐type structure are appropriate for substitution by dimensionally and chemically similar atoms (Tl), which is different from the apical sites in which electronegativities or bond strengths are more important (Pt).     

Design,Synthesis, and Application of an Optimized Monofluorinated Aliphatic Label for Peptide Studies by Solid‐State 19F NMR Spectroscopy

A conformationally restricted monofluorinated α‐amino acid, (3‐fluorobicyclo[1.1.1]pentyl)glycine (F‐Bpg), was designed as a label for the structural analysis of membrane‐bound peptides by solid‐state ¹⁹F NMR spectroscopy. The compound was synthesized and validated as a ¹⁹F label for replacing natural aliphatic α‐amino acids. Calculations suggested that F‐Bpg is similar to Leu/Ile in terms of size and lipophilicity. The ¹⁹F NMR label was incorporated into the membrane‐active antimicrobial peptide PGLa and provided information on the structure of the peptide in a lipid bilayer.     

Azopolymer-based micro- and nanopatterning for photonic applications

Azopolymers comprise a unique materials platform, in which the photoisomerization reaction of azobenzene molecules can induce substantial material motions at molecular, mesoscopic, and even macroscopic length scales. In particular, amorphous azopolymer films can form stable surface relief patterns upon exposure to interfering light. This allows obtaining large-area periodic micro- and nanostructures in a remarkably simple way. Herein, recent progress in the development of azopolymer-based surface-patterning techniques for photonic applications is reviewed. Starting with a thin azopolymer layer, one can create a variety of photonic elements, such as diffraction gratings, microlens arrays, plasmonic sensors, antireflection coatings, and nanostructured light-polarization converters, either by using the azopolymer surface patterns themselves as optical elements or by utilizing them to microstructure or nanostructure other materials. Both of these domains are covered, with the aim of triggering further research in this fascinating field of science and technology that is far from being harnessed. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014 , 52, 163–182     

5-Methyl-1,3-cydohexanedione in the synthesis of benzo[a]phenanthridine derivatives

By condensation of arylmethylene-2-naphthylamines with 5-methyl-l,3-cyclohexanedione 5-aryl-2-methyl-1,2,3,4,5,6-hexahydrobenzo[a]phenanthridin-4-ones were synthesizes.     

Error Analysis of a Projection Method for the Navier–Stokes Equations With Coriolis Force

In this paper a projection method for the Navier–Stokes equations with Coriolis force is considered. This time-stepping algorithm takes into account the Coriolis terms both on prediction and correction steps. We study the accuracy of its semi-discretized form and show that the velocity is weakly first-order approximation and the pressure is weakly order \frac12\frac{1}{2} approximation.     

Reductive transformations of Schiff bases in the synthesis of functionally substituted heteroaromatic amines

Schiff bases synthesized by condensation of 5- and 6-aminoquinolines, 5-amino-2-methylquinoline, nitroanilines, and pyrimidinylaminoanilines with substituted benzaldehydes and pyridinecarbaldehydes were reduced with sodium tetrahydridoborate in acetic acid to obtain the corresponding N-aryl(hetaryl)benzylamines, N-(pyridylmethyl)anilines, and N-(1,2,3,4-tetrahydroquinolyl)benzylamine derivatives. The reduction of arylhetarylimines with hydrazine hydrate in the presence of Raney nickel involved only the azomethine C=N bond, while the nitrogen-containing heteroaromatic ring remained intact. Under analogous conditions, nitrosubstituted Schiff bases and benzyl- and pyridylmethylamines were converted into previously unknown N-(aminobenzyl)quinolinamines and aryl(pyridyl)methyl-substituted phenylenediamines.     

Synthesis of new haloderivatives of benzo[<Emphasis Type="Italic">f</Emphasis>]quinoline and 4,7-phenanthroline

By condensations of 2-naphthylamine and 6-aminoquinoline with halogen-substituted benzaldehydes, 3-acetylpyridine and acetophenone derivatives new 1,3-diaryl(heteryl)benzo-[f]quinolines and 4,7-phenanthrolines were synthesized containing atoms of fluorine, bromine, and chlorine in the phenyl rings.     

Phendione and anisylhydroresorcinol in the synthesis of 1,7-phenanthroline derivatives

Condensation of 5-phenyl-1,3-cyclohexanedione and 5-(p-methoxyphenyl)-1,3-cyclohexanedione with 5-quinolylamine and aldehydes of aromatic, heteroaromatic, and cyclohexene series provided new 7-aryl(heteryl, cyclohexenyl)-10-phenyl- or (p-methoxyphenyl)-7,10,11,12-tetrahydro-9H-benzo[b][1,7]phenanthrolin-8-ones containing two asymmetrical atoms C⁷ and C¹⁰. ¹H NMR spectroscopy revealed the presence of diastereomers in the target reaction products.     

Poly(ethylene oxide)–poly(ethylene imine) block copolymers as templates and catalysts for the in situ formation of monodisperse silica nanospheres

Block copolymers based on poly(ethylene oxide) (PEO) and poly(ethylene imine) (PEI) are efficient catalysts/templates for the formation of uniform silica nanoparticles. Addition of tetraethylorthosilicate to a solution of PEO–PEI or PEI–PEO–PEI block copolymers results in the formation of silica particles with a diameter of ca. 30 nm and narrow size distribution. The particles precipitated with the diblock copolymers can be redispersed in water after isolation as individual nanoparticles. Evidently, block copolymers based on PEO and PEI serve as excellent templates for the biomimetic and “soft” synthesis of silica nanoparticles.