Materials Literature
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The host/guest chemistry of intercalation systems provides a highly variable potential for synthesis strategies aiming at the controlled preparation of complex organized structures in the nanoscale regime at low temperatures. Specific aspects of actual progress are considered concerning the synthesis and functional mo…
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Platinum-catalyzed hydrosilylation of allyl glycidyl ether (AGE) with octahydridosilsesquioxane ((HSiO1.5)8, T8H) and octakis(dimethylsiloxy)silsesquioxane ((HMe2SiOSiO1.5)8, Q8M8H) provides access to tetra- and octaepoxy-functionalized cubic silsesquioxanes (cubes). The resulting epoxy cubes offer “masked” silica con…
SiO2–ZrO2 and SiO2–TiO2 mixed oxides with various metal contents have been prepared by a non-hydrolytic sol–gel route involving the condensation between chloride and isopropoxide functions at 110 °C. Well condensed, monolithic gels were obtained in one step, without the use of additives. The Si/M ratio of the oxide ma…
The beneficial effect of nitrogen in steels in resistance against localized corrosion, pitting and crevice corrosion is well proven, but not yet fully understood. The results on dissolution of nitrogen steels in acids are controversial, but the dissolution of Fe-N alloys is enhanced compared to pure iron. Many surface…
Extreme non-Arrhenius dependence of the ionic conductivity in optimized fast ion conducting glasses has been observed. When all the chemical factors controlling the ionic conductivity in glass have been optimized, the conductivity fails to reach the values expected, $>0.1$ $(\ensuremath{\Omega}\mathrm{cm}{)}^{\ensu…
Synthesis of the vinyl sulfone and chloroethyl sulfone derivatives of poly(ethylene glycol) (PEG) is described. The chloroethyl sulfone (CES-PEG) is rapidly converted to the vinyl sulfone (VS-PEG) in the presence of base but is stable in water at neutral pH. Reactions with small molecules such as beta-mercaptoethanol…
Five amphiphilic alpha-helical peptides of 18 residues containing a hydrophobic Trp residue as a fluorescence probe were designed. The peptides were made up of hydrophobic Leu and hydrophilic Lys residues of a ratio of 13:5, 11:7, 9:9, 7:11, and 5:13 (abbreviated as Hels 13-5, 11-7, 9-9, 7-11, and 5-13, respectively).…
The crystalline morphology of a relatively high molecular weight isotactic polypropylene (i-PP) ( M w = 18000 g/mol) with well-defined regio- and stereoirregularities is studied by means of atomic force microscopy (AFM), wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and light microscopy. Thi…
J. Rebek, Chem. Soc. Rev., 1996, 25, 255 DOI: 10.1039/CS9962500255
Doxorubicin is a potent antineoplastic agent with activity against numerous human cancers. Encapsulation of doxorubicin inside a liposome alters bioavailability, biodistribution and thus its biological activity significantly. The physical properties of the liposome (size, lipid components and lipid dose) play a major…
Fluorescence decay dynamics and structure of a meso -tetrakis( p- sulfonatophenyl)porphyrin, referred to herein as either H 2 TSPP 4- or TSPP, which aggregates in highly acidic homogeneous solution, are discussed. The fluorescence lifetime of the aggregate is found to depend on whether electronic excitation is to the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Versatile and Highly Efficient Catalyst System for the Preparation of Polyesters Based on Lanthanide Tris(2,6-di-tert-butylphenolate)s and Various AlcoholsWillem M. Stevels, Marc J. K. Ankoné, Pieter J. Dijkstra, and Jan FeijenVie…
Pentadentate ligands (salpr) anchored to the surface of MCM-41 type silica through covalently linked organic moieties are further converted into MnIII(salpr) complexes by ligand exchange without loss of the regular porous structure of the support.
In this last paper of a series devoted to uncatalyzed and catalyzed reduction of NO by carbon, we discuss some mechanistic aspects of this reaction, which is thought to be a viable alternative to selective catalytic reduction by ammonia or hydrocarbons. We present a summary of the results of isothermal and temperature…
Four valence tautomeric complexes with the general composition [Co(3,5-DTBSQ) 2 (N⌒N)] have been investigated, where 3,5-DTBSQ - is the semiquinonate form of 3,5-di- tert -butyl- o -quinone. The diiminium ligand N⌒N is one of the following ligands: phen (1,10-phenanthroline, complex 1 ); bpy (2,2‘-bipyridine, complex…
Abstract An extrusion process for manufacturing microcellular plastics is presented. In the past, microcellular structures have been produced in batch processes by using a thermodynamic instability of a polymer/gas system. In order to utilize such a thermodynamic instability in a continuous extrusion process, a large…
A new concept for the synthesis of hyperbranched macromolecules involving the use of AB x macromonomers containing linear oligomeric units is introduced. This methodology is used for the preparation of a series of novel hyperbranched poly(ethylene glycol) derivatives containing linear poly(ethylene glycol) units of va…
A series of symmetric derivatives of 4-(dicyanomethylene)-2-methyl-6-( p -(dimethylamino)styryl)-4 H -pyran (DCM laser dye) has been synthesized, and the nonlinear optical properties and thermal decomposition temperatures of each of the chromophores has been measured. The symmetric chromophores all have larger hyperpo…
The synthesis and characterization of the tapered building blocks 3,4,5-tris(1 H,1 H,2 H,2 H,3 H,3 H,4 H,4 H,5 H,5 H,6 H,6 H,7 H,7 H,8 H,8 H -perfluorododecan-1-yloxy)benzoic acid ( 11-8/4 ), 3,4,5-tris(1 H,1 H,2 H,2 H,3 H,3 H,4 H,4 H,5 H,5 H,6 H,6 H -perfluorododecan-1-yloxy)benzoic acid ( 11-6/6 ), 3,4,5-tris(1 H,1…