Materials Literature
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The functional macrocyclic precursors (abbreviated as BC[4]Si and C[4]Si) derive from two kinds of calix[4]arenes, p-tert-butylcalix[4]arene (BC[4]) and calix[4]arene (C[4]) grafted by 3-(triethoxysilyl)propyl isocyanate (TESPIC) through base-initiated nucleophilic addition, and then three series of novel luminescent…
We report on chemical etching of ordered Au nanostructure arrays to continuously tune their localized surface plasmon resonances (LSPR). Real-time extinction spectra were recorded from both Au nanodisks and nanospheres immobilized on glass substrates when immersed in Au etchant. The time-dependent LSPR frequencies, in…
Here we examine the constituent components that make a magnetocaloric material attractive for application. The field-temperature phase diagram is studied and using calorimetry, the first-order and second-order components of the magnetic field-driven magneto-structural phase transition in ${\text{CoMnSi}}_{0.92}{\text{…
A family of new glycosyl-nucleoside lipids (GNLs) that were prepared using a convenient "double click" chemistry route is described. Physicochemical studies (surface tension measurements, gelation properties, and transmission electron microscopy) indicate that these amphiphiles spontaneously assemble into supramolecul…
Ordered water: Gypsum has been used for construction for millennia. The structure and water content of calcined gypsum, CaSO(4)0.5 H(2)O, has been under discussion until now: single-crystal structure analysis (see picture: S yellow, Ca gray, O blue, H red) provides an ordered model that is confirmed by DFT calculation…
The importance of basis sets and active spaces in the determination of the potential energy curves and relevant energy differences in the O(h)-symmetry model system [Fe(NCH)(6)](2+) is analyzed using the Complete Active Space Self-Consistent Field (CASSCF) method and subsequent second-order perturbative treatment (CAS…
Abstract Acidity is crucial : The effect of halide and acid addition on the direct synthesis of hydrogen peroxide is studied for magnesium oxide‐ and carbon‐supported bimetallic gold–palladium catalysts. When using a Au–Pd/C catalyst, the acidity of the methanol/water solvent has a profound effect on the productivity…
Go for the gold! The structural evolution of peptide binding and assembly on a Au(111) surface is dynamic and involves surface diffusion and multiple stages of molecular thin-film topology development (see schematic depiction and corresponding AFM images). The new fundamental observations may form the basis of peptide…
Heat capacity, magnetic susceptibility, NMR, and resistivity of ${\text{SrNi}}_{2}{\text{P}}_{2}$ single crystals are presented, illustrating a purely structural transition at 325 K with no magnetism. Bulk superconductivity is found at 1.4 K. The magnitude of the transition temperature ${T}_{c}$, fits to the heat-capa…
Structural transition properties of the LiBH4+xLiI (x=0–1.00) pseudobinary system were examined by powder x-ray diffraction and differential scanning calorimetry combined with periodic density functional theory calculations. We experimentally and computationally confirmed the stabilization of the high-temperature [hex…
We show that optical reflection microscopy is a reliable method to simultaneously locate and count graphene layers deposited on bulk, transparent substrates such as soda-lime glass. The visible contrast in optical reflection versus graphene layer number is resolvable on bulk substrates. A simple Fresnel theory based o…
For every 100 purified proteins that enter crystallization trials, an average of 30 form crystals, and among these only 13-15 crystallize in a form that enables structure determination. In 2007, Dong et al reported that the addition of trace amounts of protease to crystallization trials--in situ proteolysis--significa…
Abstract Energiesparen ist angesagt! Eine Steigerung der Energieffizienz ermöglichen neue anorganische lumineszierende Materialien, wie sie in Displays und weißen Leuchtdioden (Bild: Farbdiagramm; Mischung der drei Emissionen A–C liefert beliebige Farbtöne innerhalb des Dreiecks) zum Einsatz kommen. In Hg‐freien Leuch…
The tripodal H(3)thqtcn ligand allows the synthesis of well-defined neutral monomeric syn-tris(hydroxyquinolinate) complexes of lanthanides. Pure [Ln(thqtcn)] complexes (Ln = Nd, 1; Er, 2; Yb, 3) of the triply deprotonated ligand thqtcn(3-) were prepared. Crystallographic characterization was carried out for complexes…
ZnO nanoparticles have been identified as a new generation of biofriendly cell labeling agents since they are nontoxic, less expensive, and chemically stable in air. However, ZnO nanoparticles show poor water stability due to high equilibrium concentration of Zn species in water in a wide pH range. In this work, a one…
A pair of chiral bola-type enantiomers, ll-12PyBr and dd-12PyBr, was synthesized. They can cause physical gels in pure water. Sol-gel transcriptions were carried out to control mesoporous 1,4-phenylene-silica nanostructures and helicity using the organic self-assemblies of these amphiphiles as templates. Under acidic…
Abstract Sievilized chemistry : Molecular sieves are highly active and selective catalysts with industrial potential for acylation reactions. Zeolites are the catalysts of choice when shape‐selectivity influences the preferential formation of some products, while high conversions are achieved over mesoporous catalysts…
Solution chemistry methods have been used to synthesize bimetallic CuPt alloy nanoparticle catalysts with controllable sizes and shapes. By variation of the relative ratios of the oleylamine and oleic acid stabilizers, solvent, and reduction rate, the nanoparticles could be tuned from approximately 2 nm spherical part…
The orbital motion of electrons in a three-dimensional solid can generate a pseudoscalar magnetoelectric coupling $θ$, a fact we derive for the single-particle case using a recent theory of polarization in weakly inhomogeneous materials. This polarizability $θ$ is the same parameter that appears in the "axion electrod…
We investigated temperature and magnetic field dependent radio-frequency electromagnetic absorption in La0.67Ba0.33MnO3 by monitoring changes in resonance frequency (fr) and current (I) through a LC resonant circuit powered by an integrated chip oscillator. The ferromagnetic to paramagnetic transition at TC in zero ma…