Synthesis of the first superstructured chiral corrole
The synthesis of the first chiral superstructured corrole has been achieved by reacting an original bis(diaminophenyl)corrole with two chiral binaphthyl bis(acid chloride) handles.
Materials Literature
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Common features of nanoscale structural correlations in magnetoresistive manganites with a ferromagnetic low-temperature state
We report x-ray scattering studies of nanoscale structural correlations in ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{1\ensuremath{-}x}(\mathrm{C}\mathrm{a},\mathrm{S}\mathrm{r}{)}_{x}{\mathrm{MnO}}_{3},$ $x=0.2--0.5.$ We find that the correlated regions possess a tempera…
Synthesis, photophysics, and electrochemistry of hexanuclear silver(I) chalcogenolate complexes. X-Ray crystal structures of [Ag6(µ-dppm)4(µ3-SC6H4Me-p)4](PF6)2 and [Ag6(µ-dppm)4(µ3-SeC6H4Cl-p)4](PF6)2
A series of unprecedented hexanuclear silver(I) chalcogenolate complexes with bridging dppm ligands, [Ag6(μ-dppm)4(μ3-EAr)4](PF6)2 (EAr = SPh 1, SC6H4Me-p2, SePh 3, SeC6H4Cl-p4), have been synthesized and characterized. The X-ray crystal structures of 2 and 4 have been determined. The complexes were found to exhibit l…
Oxorhenium(V) Dithiolates Catalyze the Oxidation by tert-Butyl Hydroperoxide of Sulfoxides and Sulfides, Including 4,6-Dimethyldibenzothiophene
tert-Butyl hydroperoxide (TBHP) efficiently converts a wide variety of sulfides to sulfoxides and sulfones. The method offers the advantage that one product or the other can be obtained in high purity by a modest variation of conditions. The reactions occur smoothly at 25minus sign50 C in chloroform and, to the extent…
Bottom-Up Synthesis of Polymer Nanocomposites and Molecular Composites: Ionic Exchange with PMMA Latex
Ionic exchange between electrostatically stabilized PMMA latex and aqueous dispersion of nanoparticles or rigid-rod polyelectrolytes of opposite sense is demonstrated to be a flexible approach to fabrication of polymeric-based nano and molecular composites, including layered silicates, indium tin oxide nanoparticles,…
Electrochemical synthesis of poly[2‐hydroxyethylmethacrylate] hydrogel: Kinetics and mechanism
Abstract 2‐Hydroxyethylmethacrylate (HEMA) was polymerized in an aqueous sulfuric acid– N,N ‐dimethylformamide (DMF) medium in a divided cell by an electrolytically generated mediator species titanium(III). Titanium(III)–hydroxylamine sulfate was used as the initiator redox system. The reaction was confined to the cat…
Effect of hydrogen‐bond‐breaking reagent (urea) on the dimensional stability of rat tail tendon (RTT) collagen fiber
Abstract Influence of hydrogen‐bond‐breaking reagents such as urea on shrinkage temperature, isometric tension, swelling behavior, tensile strength, and percentage extension of native rat tail tendon (RTT) were examined. The swelling behavior was observed with polarizing optical microscopy and scanning electron micros…
A Spectroscopic Ellipsometry, Surface Plasmon Resonance, and X-ray Photoelectron Spectroscopy Study of Hg Adsorption on Gold Surfaces
We report the results of a spectroscopic ellipsometry (SE) and surface plasmon resonance (SPR) study of mercury vapor adsorption on polycrystalline and (111) gold films. We found that, when Hg adsorbs onto gold films, the change in the ellipsometric parameter delta (Δ) is proportional to the thickness of the adsorbed…
Induced ferromagnetism inLaMnO3by Mn-site substitution: The major role of Mn mixed valency
In order to know if the origin of ferromagnetism induced by the substitution of Co or Ni for Mn in ${\mathrm{LaMnO}}_{3}$ could be due to their divalent oxidation states, a set of ${\mathrm{LaMn}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{O}}_{3}$ samples has been prepared for $x<~0.2$ and $M=\mathrm{Li},$ Zn, Ni, Co, Ga,…
Radiative thermal emission from silicon nanoparticles: a reversed story from quantum to classical theory
Among the rush of papers published after the discovery of visible luminescence in porous silicon, a number of them claimed that an extraordinary behaviour had been found. However, after five years of struggling with increasingly sophisticated but not completely successful models, it was finally demonstrated that it wa…
Molecular dynamics investigation of lithium borate glasses: Local structure and ion dynamics
The effect of alkali content and temperature on the microstructure of lithium borate glasses, $x{\mathrm{Li}}_{2}\mathrm{O}\ensuremath{-}(1\ensuremath{-}x){\mathrm{B}}_{2}{\mathrm{O}}_{3},$ has been investigated for glass compositions $x=0.2--0.5$ and temperatures up to 1250 K. The molecular dynamics technique has bee…
Stability of Metal Chalcogenide Nanotubes
An overview about the characteristic structure of metal chalcogenide nanotubes is given in this paper. On the basis of atomistic calculations, parameters for a model are derived, describing the stability of tubular structures. Especially the interplay between the strain energy in the tubes and the energy due to unsatu…
Auto-organisation of hybrid organic–inorganic materials prepared by sol–gel chemistry
Silica-based hybrid organic-inorganic materials prepared by sol-gel chemistry exhibit chemical and physical properties revealing their anisotropic organisation. Besides the opportunities that this phenomenon opens for the preparation of new materials, it also provides arguments to the chemist looking for a better comp…
Synthesis and near-infrared luminescence of 3d-4f bi-metallic Schiff base complexes
The reaction of the zinc(II) Schiff base complex ZnL [H2L = N,N′-bis(3-methoxysalicylidene)ethylene-1,2-diamine] with one equivalent of Ln(NO3)3·xH2O (Ln = Nd, Ho, Er or Yb) gives the neutral 3d-4f bi-metallic Schiff base complexes [Zn(NO3)(μ-L)Ln(NO3)2(H2O)], which in solution exhibit emission corresponding to the Ln…
From Strong to Fragile Glass Formers: Secondary Relaxation in Polyalcohols
We have studied details of the molecular origin of slow secondary relaxation near T(g) in a series of neat polyalcohols by means of dielectric spectroscopy and (2)H NMR. From glycerol to threitol, xylitol, and sorbitol the appearance of the secondary relaxation changes gradually from a wing-type scenario to a pronounc…
Magnetic properties ofNi2.18Mn0.82Ga Heusler alloys with a coupled magnetostructural transition
Polycrystalline ${\mathrm{Ni}}_{2.18}{\mathrm{Mn}}_{0.82}\mathrm{Ga}$ Heusler alloys with a coupled magnetostructural transition are studied by differential scanning calorimetry, magnetic and resistivity measurements. Coupling of the magnetic and structural subsystems results in unusual magnetic features of the alloy.…
Conceptual design of nanostructures for efficient photoinduced phase transitions
By means of Monte Carlo simulations on a kinetic model, we demonstrate that the efficiency of a photoinduced phase change can in general be enhanced drastically by using a superstructure of an appropriate combination of two components. This is due to the accelerated nucleation of converted domains in the structural bl…
Rheological aging and rejuvenation in solid friction contacts
We study the low-velocity (0.1--100 $μ$m.s$^{-1}$) frictional properties of interfaces between a rough glassy polymers and smooth silanized glass, a configuration which gives direct access to the rheology of the adhesive joints in which shear localizes. We show that these joints exhibit the full phenomenology expected…
Structure of nanocrystalline materials using atomic pair distribution function analysis: Study ofLiMoS2
The structure of ${\mathrm{LiMoS}}_{2}$ has been experimentally determined. The approach of atomic pair distribution function analysis was used because of the lack of well-defined Bragg peaks due to the short structural coherence (\ensuremath{\sim}50 \AA{}) in this intercalation compound. The reduction of Mo by Li res…
Nickel(II)−Molybdenum(III)−Cyanide Clusters: Synthesis and Magnetic Behavior of Species Incorporating [(Me3tacn)Mo(CN)3]
The substitution of Mo(III) for Cr(III) in metal-cyanide clusters is demonstrated as an effective means of increasing the strength of the magnetic exchange coupling and introducing magnetic anisotropy. Synthesis of the octahedral complex [(Me(3)tacn)Mo(CN)(3)] (Me(3)tacn = N,N',N"-trimethyl-1,4,7-triazacyclononane) is…