Complete rearrangement of a multi-porphyrinic rotaxane by metallation–demetallation of the central coordination site
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Measurements of Kleinman-disallowed hyperpolarizability in conjugated chiral molecules
We have designed a hyper-Rayleigh scattering scheme to measure six scalar invariants of the squared hyperpolarizability tensor β2. Our theoretical approach expresses the rotational invariants of the irreducible β components as scalars, which eliminates the need for difficult frame transformations. We applied our schem…
Structure and Stability of Aluminum-Silica Complexes in Neutral to Basic Solutions. Experimental Study and Molecular Orbital Calculations
The stability of A1H3SiO 2+, the aqueous complex formed in acid solutions between AI 3+ and H4SiO4~ has been recently quantified in the temperature range 25-300~ at Psat (Pokrovski et al., 1996; Salvi et al., 1998). It was found that the stability of A1H3SiO] + strongly increases with temperature and this complex can…
Heterogeneous molybdate catalysts for the generation of singlet molecular oxygen (1Δg) from H2O2
The immobilisation of molybdate on Mg,Al-LDH leads to an active, heterogeneous catalyst that generates singlet molecular oxygen from hydrogen peroxide in the absence of soluble base.
A study of a simulated low Earth environment on the degradation of FEP polymer
Spacecraft flying in a low Earth orbit environment require thermal blankets to provide protection from direct solar heat from the sun. Fluorinated ethylene propylene copolymer is one of the major components of these thermal blankets. In this study, the effect of a simulated low Earth orbit environment on FEP was inves…
Macroscopic glassy relaxations and microscopic motions in a frustrated lattice gas
We study microscopic and macroscopic dynamical properties of a frustrated lattice gas showing the violation of Stokes-Einstein law. The glassy behaviors are analyzed and related with experimental results in glass former systems.
Practical correction formula for elastic electron scattering effects in attenuation of auger electrons and photoelectrons
We define a new parameter to describe the effects of elastic electron scattering in XPS and AES. The parameter is the ratio of emitted intensity from a layer of atoms located at a given depth in a solid calculated from theories that take into account and neglect elastic electron scattering. We have found that the corr…
Metallomesogens: synthesis and properties
The synthesis, characterization and mesogenic behaviour of the copper(ii) and oxovanadium(iv) complexes derived from phenyltetrazole and benzothiazole and their corresponding ligands are reported. The ligands did not exhibit mesomorphism, whereas the complexes form monotropic smectic A and smectic C mesophases. The me…
Effects of RuO2 on activity for water decomposition of a RuO2/Na2Ti3O7 photocatalyst with a zigzag layer structure
Sodium trititanate, Na 2 Ti 3 O 7 , with a zigzag layer structure produces a surface lattice O – radical upon UV irradiation and has the ability to decompose water to hydrogen and oxygen when ruthenium oxide is highly dispersed on the titanate.
Characterization of island films as surface-enhanced Raman spectroscopy substrates for detecting low antitumor drug concentrations at single cell level
Gold and silver vacuum-deposited island films were characterized by studying deposition variables such as film thickness, evaporation rate, and substrate temperature. For both metals, these parameters were correlated with the surface-enhanced Raman spectroscopy (SERS) effect and an increase in film thickness and low e…
Valence tautomeric cobalt o-quinone complexes in a dual-mode switching array
The characterization of valence tautomeric cobalt complexes with an array of four states, each with different optical and magnetic properties, is reported and it is shown that they can interconvert reversibly between the four states either thermally or by redox processes.
Molecular recognition using β-cyclodextrin-modified dendrimers: novel building blocks for convergent self-assembly
The synthesis of β-cyclodextrin-based dendrimers 3 and 5 is described; using phenolphthalein as a UV–VIS active probe, it is shown that the binding cavities of these modified receptors retain their molecular recognition properties and can be employed as polyfunctional monomers in self-assembly.
Dopamine recognition in templated silicate films
Dopamine templated nanoporous silica gel films prepared via the hydrolysis and cocondensation of tetramethoxysilane with phenyltrimethoxysilane show an enhanced affinity for dopamine and its related structures relative to non-templated films.
Effects of high vacancy concentrations on the magnetic properties of La1−xMn1−yO3 (0.02⩽x, y⩽0.13)
It has been found that the synthesis conditions and subsequent annealing treatments can significantly change the magnetic and transport behavior of the colossal magnetoresistive materials of the general formula La1−zAzMnO3, where A is a divalent ion. In order to clarify the role of vacancies within this structure, res…
Chemically amplified photolithography of a conjugated polymer
The solid state photocatalytic reaction between trifluoromethanesulfonic acid and poly{3-[2-(tetrahydropyran-2-yloxy)ethyl]thiophene} is employed to fabricate polymeric patterns of conjugated polymer.
First-principles investigation of hydrogen embrittlement in polycrystallineNi3Al
The discrete-variational method within the framework of density-functional theory is used to study the effect of hydrogen on the embrittlement of polycrystalline ${\mathrm{Ni}}_{3}\mathrm{Al}$. The calculated results of impurity formation energy show that hydrogen atoms prefer to segregate at the grain boundaries, and…
Formation and in situ characterization of the first dihydrogen aqua complex: [Ru(H2O)5(H2)]2+
The product of the reaction between [Ru(H2O)6]2+ and pressurized H2 in water is [Ru(H2O)5(H2)]2+ whose nature was unambiguously demonstrated by 1H and 17O NMR and which is the first characterized dihydrogen aqua complex.
Interaction Strengths in Styrene−Diene Block Copolymers and Their Hydrogenated Derivatives
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInteraction Strengths in Styrene−Diene Block Copolymers and Their Hydrogenated DerivativesJ. LaMonte Adams, Daniel J. Quiram, William W. Graessley, Richard A. Register, and Gary R. MarchandView Author Information Department of Chemical Engineering, Princeton University, Princet…
The Effect of Biological Substrates on the Ultrafast Excited‐state Dynamics of Zinc Phthalocyanine Tetrasulfonate in Solution
Zinc phthalocyanine tetrasulfonate (ZnPcS4), a potential photosensitizer for photodynamic therapy (PDT), has been studied using femtosecond laser spectroscopy. The excited-state dynamics in water have been found to be fast (< 80 ps) and dominated by intermolecular aggregation. Since the proposed mechanism for PDT is e…
Self-assembled thin films from lamellar metal disulfides and organic polymers
The intercalation/exfoliation reactions of MoS2 and SnS2 yield lamellar colloids, which may be grown layer-by-layer on cationic surfaces by alternate adsorption of cationic clusters or polymers.