Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFormation and Interconversion of Ruthenium−Silene and 16-Electron Ruthenium Silyl ComplexesVladimir K. Dioumaev, Karl Plössl, Patrick J. Carroll, and Donald H. BerryView Author Information Department of Chemistry and Laboratory for Research on the Structure of Matter,…
A method has been developed for the condensation of droplets onto individual textile fibers in the environmental scanning electron microscope. It can be seen how the drops formed surround the fibers as long as the fiber surface is smooth. In this case they adopt an unduloid shape. The images produced of the droplets a…
Lysozyme folds through two competing pathways. A fast pathway leads directly from a collapsed state to the native protein, whereas folding on a slow pathway proceeds through a partially folded intermediate (I(1)). At NaCl concentrations above 100 mM, a second transient intermediate (I(2)) is induced as judged by the a…
The stability of europium(III) complexes with benzocrown ether derivatives 2 − 4 containing carboxylic functions with methylene spacers of different length was found to vary surprisingly little. In sharp contrast, the hydrolytic activity of these catalysts against bis( p -nitrophenyl)phosphate (BNPP) varied by a facto…
The five reduced polyoxomolybdate anions [HSiMo 12 O 40 ] 4 - (HI β ), [H 2 SiMo 12 O 40 ] 4 - (H 2 II β ), [H 5 SiMo 12 O 40 ] 3 - (H 5 IV β ), [SiMo 14 O 44 ] 4 - (SiMo 14 ), and [Si 2 Mo 28 O 84 (H 2 O) 2 ] 6 - (Si 2 Mo 28 ) have been synthesized as tetramethylammonium salts, by hydrothermal reactions, and characte…
A series of 11 chiral dopants with an atropisomeric core derived from 4,4‘-dihydroxy-2,2‘,6,6‘-tetramethyl-3,3‘-dinitrobiphenyl were synthesized in optically pure form. These compounds were doped into five different smectic C (S C ) liquid crystal hosts to induce a ferroelectric S C * liquid crystal phase, and the red…
High-level ab initio calculations with a variety of G2-based methods have been used to determine the structures and heats of formation of the alkali and alkaline earth oxides and hydroxides (M 2 O, MOH with M = Li, Na, and K; M‘O, M‘(OH) 2 with M‘ = Be, Mg, and Ca). Standard G2 theory, which is normally very reliable…
A new series of side-group liquid-crystal polymers, the poly[ω-(4-methoxybiphenyl-4‘-yloxy)alkyl acrylate]s, has been synthesized in which the spacer length is varied from 3 to 12 methylene units. The thermal behavior of the polymers has been characterized using differential scanning calorimetry and polarized light mi…
A series of merocyanine dye dimers tethered at different sites with spacers ranging from 0 to 5 methylene groups and the corresponding monomer have been synthesized. The formation, structure, and excited-state properties of the consequent merocyanine dye “aggregates” in solutions and in rigid glass have been studied b…
Metallophthalocyanines have been prepared with 18-crown-6 residues at the four peripheral benzo sites (McrPc). Metal centers employed have been H 2 (free base), Zn(II), and Cu(II). In ethanol solution containing potassium acetate, such species incorporate K + cations into the crowns, one K + per crown, and are monomer…
MCM-48 and SBA-1 samples were characterized using powder X-ray diffraction and nitrogen adsorption in a wide range of relative pressures. X-ray diffraction provided direct evidence for the high degree of pore structure ordering for the materials under study. Nitrogen adsorption showed that highly ordered MCM-48 materi…
Self-assembled natural and synthetic clay−polymer films have been prepared by sequential adsorption of poly(diallyldimethylammonium chloride) (PDDA) and clay particles onto mica. The influence of pH, polymer concentration, and clay particle size on the building and roughness of mono- and multicycle depositions was inv…
Semiconductor nanoparticles of cadmium sulfide were synthesized in ammonium perfluoropolyether (PFPE-NH 4 ) stabilized water-in-CO 2 microemulsions. The particle size was tuned by varying the water-to-surfactant molar ratio ( w 0 ): w 0 ratios of 5 and 10 yielded nanocrystals with exciton energies of 3.86 and 3.09 eV,…
Formate dehydrogenase (FDH) from Pseudomonas sp. 101 is a homodimeric enzyme that catalyzes oxidation of formate and the concomitant reduction of NAD + to produce NADH and CO 2 . The dynamic motions and distances between functional groups in the active site of the formate dehydrogenase including the NAD + cofactor and…
Density functional theory with relativistic corrections has been used to calculate the 195 Pt chemical shifts for a series of Pt(II) complexes. Good agreement with experimental values is observed with two different relativistic correction methods. Deconvolution of the parameters leading to the overall shielding of the…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Heterogeneous Tungsten Catalyst for Epoxidation of Terpenes and Tungsten-Catalyzed Synthesis of Acid-Sensitive Terpene EpoxidesAída L. Villa de P, Bert F. Sels, Dirk E. De Vos, and Pierre A. JacobsView Author Information Center for Surface Chemistry and Catalysis, Katholieke…
We present the results of quantitative variable-temperature neutron powder diffraction experiments performed on the OSIRIS instrument at the ISIS facility on the pure silica zeolites chabazite and ITQ-4. Chabazite has been found to be one of the most strongly contracting materials known, with a linear expansion coeffi…
Functional devices through self-assembly is the goal of the research presented here. Recent progress in the self-assembly of ultrathin films into layered nanoarchitectures and functional assemblies, such as the chemically modified electrode shown in the Figure, is concentrated on. Other devices examined include enzyme…
We report extensive calculations of the imaginary part of the electron self-energy in the vicinity of the (100) and (111) surfaces of Cu. The quasiparticle self-energy is computed by going beyond a free-electron description of the metal surface, either within the GW approximation of many-body theory or with inclusion,…
A quantitative comparison between the experimental microstructure of a sedimentary rock and three theoretical models for the same rock is presented. The microstructure of the rock sample (Fontainebleau sandstone) was obtained by microtomography. Two of the models are stochastic models based on correlation function rec…