Materials Literature
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Metallation of highly electron deficient 5,10,15,20-tetrakis(trifluoromethyl)porphyrin 1 with [Re2(CO)10] in refluxing PhCN resulted in a novel synthesis of oxorhenium(V) 5,10,15-tris(trifluoromethyl)corrolate 2 characterized by single crystal X-ray crystallography.
Fine and rod-like silica-based mesoporous powders with very short diameter and length have been obtained through (1) the complete dissolution of both sodium metasilicate and cationic surfactants and (2) subsequent rapid pH-adjustment for the formation of silica-surfactant mesophase products.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. A. Zaman, B. M. Moudgil; Rheology of bidisperse aqueous silica suspensions: A new scaling meth…
Conducting polymers are promising materials which show attractive electric and optical properties with potential importance in advanced technologies. Electrochromism is one of the noteworthy characteristics of conducting polymers and is effective in forming conducting polymer images and patterns on an electrode. Space…
Iron(II) cryptates, where the FeII is in the high-spin S = 2 electronic configuration, even with six sp2 N-donors, and iron(III) cryptates adopting the intermediate spin S = state have been prepared. The structure of a high-spin iron(II) cryptate utilising six sp2 N-donors shows long metal–ligand distances which effec…
The formation of the interface between aluminium and O2 or CO2 plasma-modified poly(ethylene terephthalate) (PET) has been investigated by X-ray photoelectron spectroscopy (XPS). As demonstrated by the changes in the C 1s, O 1s, and A1 2p core level spectra upon A1 deposition, the metal was found to react preferential…
A mesoporous titania was prepared from titanium tetraisopropoxide and stearic acid (STA). The pore size of the titania increases linearly from ca. 5 to 15 nm with increase in the STA/Ti ratio (X) for X < 1.5, while the change becomes negligible for X > 1.5. A mol equivalent of STA coordinates with Ti atom forming a bi…
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…