Materials Literature
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2,5-Dialkynylthiophenes (RCC)2C4H2S (R = Ph, Me3Si or But) treated successively with HBCl2 and Et3SiH in CH2Cl2 undergo hydroboration polymerization to give intensely-coloured polymers of general structure –[CHCR–BCl–CRCH–C4H2S]n– for which the 11B NMR resonances occur ca. 50 ppm upfield of those for analogous monomer…
The investigation was performed to examine the influence of undissolved Zr particles in molten magnesium on the grain refinement of Mg–Zr alloy. A Mg–30%Zr master alloy was added to the molten pure magnesium at 993 K. All samples revealed that 0.4%Zr was dissolved in the pure magnesium. Sedimentation of Zr particles o…
The synthesis of regioregular head-to-tail poly[3-(6-bromohexyl)thiophene] is reported, together with its reaction with 2-carboxyanthraquinone (Anth) to give an example of a regioregular polythiophene containing pendant functional groups (87% loading). NMR data on the two soluble polymers are reported together with pr…
The convergent synthesis of a TTF–glycol dendrimer is reported: thin layer cyclic voltammetric studies on (TTF)21 system 11 show that all the TTF units undergo two single-electron oxidations to produce the 42+ redox state spectroelectrochemical studies establish that there are intradendrimer interactions between parti…
We have successfully resolved the degradation problem of CsLiB(6)O(10) (CLBO) by means of elevated crystal temperature. CLBO crystals were continuously operated at 160 degrees C in ordinary room humidity. No degradation of performance was observed after more than 1 month. We believe that heating CLBO crystal above 130…
The reaction between Ti(OR)4 (R = Et or Pri) and 2-phenoxybenzoic acid in refluxing toluene led to [Ti6(µ3-O)6(µ-O2CC6H4OPh)6(OR)6]; its structure corresponds to an assembly of two staggered triangular units sharing six edges (actually the µ3-O ligands) and connected via the carboxylate ligands.
The hydrothermal reaction of CuCN, KCN, 2,2′-bipyridyl (bpy) and water yields [{Cu2(bpy)2(CN)}2Cu5(CN)7]· 0.17H2O 1, a two-dimensional copper–cyano network intercalated by [(bpy)2(Cu)2(CN)]+ cations and water of crystallization.
6-[F-18]Fluoro-L-3,4-dihydroxyphenylalanine (FDOPA) has been used to measure the central dopaminergic function in many species, including humans and monkeys. For transport across the blood brain barrier (BBB), FDOPA competes with plasma large neutral amino acids (LNAA). In this article we evaluate the effects of norma…
The layer-by-layer growth of film structures consisting of sequential depositions of oppositely charged macromolecules (polymers) and macrocycles (ring-shaped molecules) has been carried out using the self-assembly technique. These self-assembled structures were characterized with X-ray reflectometry, results from whi…
Excimer laser irradiation of polymers can be used to generate a modification of the surface morphology at the irradiated regions. The normally smooth surface of synthetic fibres can be modified by this non-contacting technique to a regular, roll-like structure, which has a great effect on general properties of the fib…
Oxygen vacancies play a key role in determining the functionality and performance of many oxide smart materials. In this paper, the crystal structure of an anion-deficient perovskite-type orthorhombic (with a ≈ b) phase La0.5Sr0.5CoO2.25 (or La8Sr8Co16)36) has been determined for the first time with the combined use o…
The important surface energy and acid-base properties for pine wood (Pinus silvestris L.) have been estimated by using two contact angle techniques (CAT), e.g., the sessile drop method and the Wilhelmy plate method, respectively. According to the results, the pine wood may be characterized as a low surface energy poly…
5,10,15,20-Tetraphenylsapphyrin (TPSH3, I0) presents an unusual structural skeleton with an inverted pyrrole ring lying opposite to the bipyrrolic unit. The acid–base chemistry of sapphyrin, involving hydrogen chloride, dichloroacetic acid or trifluoroacetic acid in chloroform, dichloromethane (293 and 203 K) and DMSO…
The sorption of chromate and dichromate ions by a [Zn-Al-Cl] layered double hydroxide was investigated. The anionic clay, prepared by coprecipitation at pH 8, was found to be pure upon characterization by X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetry and to have low BET surface area…
The combination of anisometric sub-units with an additional intramolecular functionality has frequently resulted in the creation of supramolecular systems not only able to form thermotropic mesophases due to their anisotropic molecular shape but also capable of structure formation resulting from their amphiphilic prop…
Two new pentaerythritol-functionalised 2,2′:6′,2″-terpyridine (tpy) derivatives have been prepared. One contains four tpy metal-binding domains, whereas the other contains one tpy domain and three pendant CH2OH groups. The combination of these components with ruthenium-containing building blocks has allowed the specif…
Giganticine (1), a novel nonprotein amino acid, has been isolated from a methanol extract of the root bark of Calotropis gigantea and its structure established by spectroscopic methods. It exhibited a significant antifeedant activity against nymphs of the desert locust Schistocerca gregaria.
Hybrid materials have been prepared through the sol–gel route from poly(tetraethylene glycol malonate) (PTEGM) and titanium isopropoxide (TIP) in acidic media. The bulk gels were characterised by thermal analysis (TG, DSC and TMA), wide-angle X-ray scattering (WAXS), transmission electron microscopy (TEM) and FTIR. Th…
For the rehabilitation of the degraded and abandoned land in the tropical area, it needs to define the various characteristics of remaining natural forests. This work was done to find out a physical hazard for root elongation of plant at Lambir Hills National Park, Miri, Sarawak, Malaysia, with special reference to so…
There has been extensive work done in recent years on the analysis and synthesis of systems having memoryless, sector bounded nonlinearities and uncertainties. In this paper we take a fundamentally different approach to develop tests of the stability of systems with hysteresis nonlinearities which, in general, have me…