Materials Literature
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Experimental solubilities are reported for anthracene dissolved in ternary 1-propanol + 1-butanol + cyclohexane, 1-propanol + 2-butanol + cyclohexane, 2-propanol + 1-butanol + cyclohexane, and 2-propanol + 2-butanol + cyclohexane solvent mixtures at 298.15 K. Nineteen compositions were studied for each of the four sol…
Edible films used as moisture barriers can enhance food quality. Dispersed phase particle size distributions of microfluidized whey protein−fatty acid emulsion films were measured to determine the effect of fatty acid type on microstructure. Emulsions of saturated fatty acids from C 14 to C 22 and whey protein isolate…
Beachtlich erweitert wurde die Gruppe der Ag-Se-Cluster durch die Synthesen der Titelverbindungen – eine Bestätigung für das Konzept, durch das Anbringen von organischen Liganden an der Clusteraußenseite die Zusammenlagerung zu stabilen binären Seleniden zu vermeiden. Das als Schutzligand verwendete Phosphan hat einen…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
A noncyanocarbon-based molecule-based magnet [MnIIITPP]+[QCl4].− has been prepared, comprising tetraphenylporphinatomanganese(III), MnIIITPP, and tetrachloro-1,4-benzosemiquinone, QCl4. As structural motif it has a coordination-polymer structure with uniform, one-dimensional linear chains of alternating, albeit disord…
Triple-deckers 1 and 3 are extremely labile with respect to an exchange of their bridging arene middle deck. Crossover exchange experiments between 1, 3, benzene, and azulene have unraveled for the first time a dissociative mechanism for ligand exchange in organometallic triple-decker complexes. Further preparative ut…
The EtOH extract of the leaves of Holarrhena curtisii yielded five new steroidal alkaloids: 17-epi-holacurtine (3), 17-epi-N-demethylholacurtine (4), holacurtinol (5), 3alpha-amino-14beta-hydroxypregnan-20-one (7), and 15alpha-hydroxyholamine (8), in addition to the known compounds, holacurtine (1), N-demethylholacurt…
1200 Moleküle des Lösungsmittels können von einem Molekül des kationischen, dimeren Tensids 1 bei der Gelbildung in CHCl3 immobilisiert werden. Diese neuen Geliermittel enthalten chirale Gegenionen und bilden sowohl in organischen Lösungsmitteln als auch in Wasser Gele, indem sie sich zu helicalen Aggregaten zusammenl…
The selective incorporation of gold, when and where desired, within dendritic and multidendritic macromolecules can be accomplished by means of complexation on internal PNPNPS, PNPS, and PR2 groups; up to 90 AuCl moieties can be grafted into the internal layers of a multidendritic giant molecule (see picture).
Through a hole in a poly(ethyl acrylate) (PEA) layer that is electrochemically grafted to the surface of a vitreous carbon electrode-that is the route that must be taken by a growing polypyrrole nanowire in the electropolymerization of pyrrole. Chain growth is controlled by diffusion of the monomer through the DMF-swo…
A 1,3,5-alternate conformation of the pyrrole rings is adopted by the calix[6]pyrrole 1 in the crystal (see picture). Compound 1 was synthesized in a two-step process and although it crystallizes in the form of the adduct 1⋅3CH3COCH3⋅H2O⋅CHCl3, there are no solvent molecules in the cavity (cross section ca. 60Å2) of t…
The structural transformations and the photochromic properties of the 7-hydroxyflavylium ion have been investigated by means of the pH jump technique and continuous and pulsed light excitation. The various forms of flavylium compounds, trans- and cis-chalcone (Ct and Cc), quinoidal base A, and hemiacetal form B, are r…
The kinetics of the weight loss for the thermal decomposition of five different types of waste wood (forest wood, wood from demolition of buildings, dismantled slot machines, old furniture, and used or broken pallets) was investigated by dynamic and isothermal experiments in a thermogravimetric analysis (TGA) apparatu…
Great caution must be exercised when applying the 1 CF2≈1.5 CH2 “rule” for surfactants: when grafted to a fluorinated chain, a hydrocarbon chain does not fully participate in micellization and adsorption processes, so these are controlled primarily by the length of the -CF2- chain. It is proposed that the hydrocarbon…
No heteroatom required! In many solid-phase syntheses, after the release from the polymer support a heteroatom (e.g. O, S, N) remains in the substrate as a residue of a linking protecting group. With polymer-bound tin reagents cleavage and cyclization of the substrate with C-C bond formation (see picture) can now be a…
The stability of the oxidation state +4 decreases from silicon to element 114, as shown by relativistic and nonrelativistic calculations on the hydrides, fluorides, and chlorides of the Group 14 elements (the energies of the decomposition reaction (1) are given in the plot). Thus it is unlikely that superheavy element…
A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of th…
Naked metallic and semiconducting single-walled carbon nanotubes (SWNTs) were dissolved in organic solutions by derivatization with thionychloride and octadecylamine. Both ionic (charge transfer) and covalent solution-phase chemistry with concomitant modulation of the SWNT band structure were demonstrated. Solution-ph…
The grain size dependencies of magnetic properties in granular perovskite La 0.82 Sr 0.18 MnO 3 have been investigated. With grain growth, both an evident decrease of magnetization and the lattice distortions have been simultaneously observed. The phenomenon suggests a structure-coupled change of magnetism in the hole…