Materials Literature
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Electrostatic interaction is introduced between the host and guest in the synthesis of faujasite-Y confined metallotetrakis(N,N,N-trimethylanilinium) porphyrin cations (MTMAnP4+); the synthesized composites display high catalytic activity in the oxidation of cyclohexene.
Photosensitive copper phthalocyanine-(CuPc) doped silica mesoporous materials (in powder) have been directly synthesized by a self-organizing coassembly process using a functional surfactant, 11-ferrocenyltrimethylundecylammonium (ferrocenyl TMA) molecules. This simple method shows that it is not necessary to dope mol…
A new method of measuring the layer charge of smectites by IR spectroscopy is proposed based on the integrated intensity measurement of the band assigned to the ammonium fundamental upsilon 4 mode of NH (super +) 4 -exchanged clays. Measurements are made before and after Li fixation (Hofman & Klemen effect). These all…
An analysis of the urea method as a way to synthesize uniform colloidal particles is presented. Various selected cases of precipitation and coprecipitation are reviewed to illustrate the inherent complexities of the method. The importance of the kinetics of urea hydrolysis is recognized. The concept of trajectory is u…
3,4-Diarylpyrroles (1) have been directly prepared in 20–50% yield by the reaction of β-nitrostyrenes with aqueous TiCl3 in 1,4-dioxane. Pyrroles 1 were also prepared via Barton–Zard pyrrole synthesis using the reaction of α-nitrostilbenes with ethyl isocyanoacetate followed by de-ethoxycarbonylation. 3,4-Diarylpyrrol…
A composite film comprising TiO2 and CdS nanoparticles was fabricated based on an alternating deposition method; this was confirmed by UV–VIS spectroscopy, TEM, and photocurrent measurements.
Slow diffusion of aqueous solutions containing K4[MoIII(CN)7]·2H2O and a MnII salt, respectively, affords well shaped single crystals of two cyano-bridged bimetallic phases ordering ferromagnetically with a pronounced magnetic anisotropy in the magnetically-ordered phase.
Modified Mg–Al hydrotalcite (Mg:Al = 3:1) prepared by thermal decarbonation followed by rehydration of a conventional Mg–Al hydrotalcite is found to be a highly active, reusable and air stable catalyst for cyanoethylation of alcohols.
The reaction of ethanolic/water solutions of NiX 2 ·6H 2 O (X = NO 3 -, ClO 4 - ), bidentate amine N,N,N‘,N ‘-tetramethylethylenediamine (tmen) and N,N,N ‘-trimethylethylenediamine (trimen) with [Cu(oxpn)] (oxpn = N, N ‘-bis(3-aminopropyloxamide) and ammonium thiocyanate, in the presence of ammonium hexafluorophosphat…
1. INTRODUCTION 1.1. Background Schlenk was the first to use the term inclusion compound (IC) to describe the crystalline adducts in which one component (host molecule) crystallizes into a matrix, isolating the second component (guest molecule) into cavities of well-defined geometry [1]. Most of the ICs reported have…
Summary: The growth behaviour of Alcaligenes eutrophus on phenol was investigated in continuous cultures to identify the phenomena limiting both growth efficiency and substrate degradation rates. It was shown that the fixed stoichiometry of the meta pathway of phenol degradation, leading to equimolar quantities of pyr…
A Cu/ZrO2 (1 wt.% Cu) catalyst shows high activity for the NO–CO reaction, even at low temperature (100–200 °C). However, the low-temperature activity is easily lost during prolonged reaction at 250 °C. The activity of the deactivated Cu/ZrO2 catalyst is completely restored by NO treatment (1% in He) at >250 °C or O2…
New types of π-electron donors and acceptors with high polarizability are reviewed. TTF derivatives with polarizable substituents, π-extended TTF analogues fused with nitrogen-containing heterocycles and non-TTF donors (i.e. electron donors) and chalcogen atom-containing quinones, TCNQ and DCNQI analogues (i.e. electr…
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The low-field magnetization $M$ and susceptibility \ensuremath{\chi} are reported for the two-layered Ruddleson-Popper phase ${\mathrm{S}\mathrm{r}\mathrm{O}(\mathrm{L}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}{)}_{2}\mathrm{ }\mathrm{for}\mathrm{ }x=0.4$ (denoted ${\mathrm{La}}_{1.2}{\mathrm{Sr…
The redox behaviour of polypyrrole layers prepared by the electrochemical oxidation of pyrrole in acetonitrile solutions was studied using insitu EPR/UV–VIS spectroelectrochemistry. Various supporting electrolytes: p-toluene sulfonic acid, tetrabutylammonium perchlorate (TBAP) and tetraethylammonium p-toluene sulfonat…
The [2+4]cycloaddition of the novel A4B building block 2,3,4,5-tetrakis(4-triisopropylsilylethynylphenyl)cyclopenta-2,4-dienone 3 with 3,3’,5,5’-tetraethynylbiphenyl 1 allows the rapid synthesis of a spherical polyphenylene nanoparticle with 102 benzene rings.
ZnS nanocrystallites effectively enhanced photo-reduction of chlorinated benzene derivatives in the presence of triethylamine as a sacrificial electron donor under UV irradiation (λ > 300 nm), leading to selective and stepwise dechlorination to give benzene at the final stage.
Structure and reactivity of cellulose structure and properties swelling and dissolution degradation heterogeneous and homogeneous reactions analytical methods.
This paper deals with the flashover mechanism and performance of contaminated nonceramic (also known as composite and polymeric) outdoor insulators under wet conditions. Two types of wetting that occur in service, namely fog and rain, were considered. Different profiles of line insulators having weathersheds made from…