Materials Literature
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Abstract The cyclopalladation of 1,1′‐azonaphthalene (= di(naphthalen‐1‐yl)diazene; 2 ) with bis(hexafluoroacetyl‐acetonato)palladium(II) (3; [Pd(hfa) 2 ]) yields the ortho ‐palladated complex (1,1,1,5,5,5‐hexafluoropentane‐2,4‐dionato‐κ 2 O , O ′)[1‐(naphthalen‐1‐ylazo‐κ N 2 )naphthalen‐2‐yl‐κ C 2 ]palladium(II) ( 4…
Three different types of polynuclear Mn II complexes with carboxylate bridges were obtained from the reaction of Mn(RCOO) 2 with 2,2‘-bipyridine (bpy). Dinuclear complexes [Mn 2 (μ-RCOO) 2 (bpy) 4 ](ClO 4 ) 2 with R = 2-ClPh, 3-ClPh, 4-ClPh, Ph ( 1 − 4 ); trinuclear complexes [Mn 3 (μ-RCOO) 6 (bpy) 2 ] with R = 2-ClPh…
The polyvalent cations Mg2+, Zn2+, and Al3+ were intercalated into V2O5 aerogel to a maximum concentration of 4, 2.5, and 3.33 equiv, respectively, per mole of V2O5. The intercalation was reversible in each case, analogous to the intercalation of Li+ ions. Pillaring of the host facilitates the intercalation process.
Using a near-field scanning optical microscope capable of quantitative polarimetry, we map the anisotropic strain fields associated with individual submicron defects near the fusion boundaries of SrTiO$_{3}$ bicrystals. Many defects exhibit unexpected spiral-shape strain patterns, whose handedness is believed to be li…
The interactions of several water-soluble ionic porphyrins with different ionic or neutral surfactants in aqueous solutions were studied as a function of surfactant concentration. The interaction leads to the formation of porphyrin aggregates and/or micelle-encapsulated monomers with the exception of those porphyrin−s…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A correlation between the orientation of [TCNE] • - (TCNE = tetracyanoethylene) bound to a [Mn III (por)] + (por = substituted meso -tetraphenylporphyrin) and the magnitude of magnetic coupling for a series of previously prepared [Mn(por)][TCNE]·2PhMe linear-chain molecule-based ferrimagnets has been identified. The t…
A study of striking structural differences in the magic angle of Py2S and coligand effects has been carried out. [Co(Py2S)2Cl2]n is the first integral two-layer interwoven sheet without any counterion or solvate whereas [Co(Py2S)2(NCS)2]n affords a double-stranded linear infinite structure. Thermal analyses of the com…
Interplay between kinetic roughening and phase ordering is studied in a growth SOS model with two kinds of particles and Ising-like interaction by Monte Carlo simulations. We found that, for a sufficiently large coupling, growth is strongly affected by interaction between species. Surface roughness increases rapidly w…
We have performed ab initio pseudopotential calculations for the diamond (111) surface with nitrogen or boron replacing the surface carbon atoms. Surface boron atoms form planar ${\mathrm{sp}}^{2}$ bonds with carbon atoms and the compressive stress from the underlying bulk diamond lattice squeezes the B-C bonds signif…
A reactive sodium polysulfide melt provides the one-dimensional compound NaNbS6 at 350°C. It contains anionic chains of condensed NbS9 polyhedra that are separated by Na+ ions (see picture below). NaNbS6 decomposes at about 400°C and transforms into the layered intercalation compound NaNbS2.
We study the electronic eigenstates on two- and three-dimensional quasiperiodic lattices using a tight-binding Hamiltonian in the vertex model. In particular, we analyse how a quasiperiodic lattice influences the decay form and the self-similar structure of the wave functions. The investigation of the earlier-suggeste…
The Loewenstein rule, according to which the AlO4 tetrahedra in aluminum silicates should always be separated by silicon atoms, is apparently not valid for molecular aluminum silicates such as 2, because the linkage of the AlO4 tetrahedra does not change when the four acidic protons of 1 are replaced by lithium atoms.
A new phosphor, (Gd1.54Zn0.46)O3−δ:Eu0.063+, with a photoluminescent quantum efficiency of ≈86% and a superior color chromaticity (x=0.656, y=0.344) compared to the state of art red phosphor Y2O3:Eu3+ was identified using the combinatorial thin film synthesis method. This phosphor may replace Y2O3:Eu3+ in display appl…
Using neutron diffraction at very high pressures (up to 20.5 GPa), we studied magnetic interactions in the model system EuX ( $X\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\mathrm{S}$, Se, Te) in a wide range of lattice constants. Surprisingly, when interatomic distances decrease, the Curie temperatures increas…
GeO4 tetrahedra and GeO6 octahedra, which form nine-rings (see sketch on the right), feature in the unprecedented structure of the microporous solid, (NH4)2Ge7O15. This compound provides the first evidence that in the GeO2/NH4+ system the cubic (NH4)3HGe7O16⋅n H2O is not the only existing phase, but depending on the G…
Cis/trans isomerization of the alkene in these pyridine-functionalized porphyrins results in a reorganization of the molecular architecture: the polymeric trans form of 1 transforms into the dimeric cis form when irradiated with UV light. A cis/trans mixture of isomers is obtained when the pure compounds are treated w…
The temperature dependence of the dc conductivity \ensuremath{\sigma} of most glass-forming and crystalline ionic conductors is Arrhenius with constant activation energy, ${E}_{\ensuremath{\sigma}}$, at sufficiently low temperatures or conductivity levels. However, \ensuremath{\sigma} becomes non-Arrhenius at high tem…
Danger of collapse! The structure of hydrated high-alumina cement, whose use as a building material was highly controversial after several accidents occurred, was now determined to be CaAl2O4⋅7.8 H2O from X-ray powder diffraction data by applying direct methods. A picture of the structure as viewed along the c axis is…
Time-correlated single-photon counting reveals that the width of flashes of sonoluminescence ranges from under 40 to over 350 ps for mixtures of various gases in water. Flash widths and emission times are independent of wavelength from the ultraviolet to the infrared. These measurements suggest that sonoluminescence o…