Materials Literature
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Nuclear magnetic resonance (NMR) measurements have been used as a microscopic probe of the static and dynamic behavior of unstretched and stretched films of complexes. The stretched sample was previously reported to exhibit a fivefold increase in the ionic conductivity at ambient temperatures. The NMR data indicate th…
Polarizing microscope textures of the twist grain boundary A* (TGBA*) phase are reviewed for two different compounds in different geometries with different surface treatments giving monostable planar and homeotropic boundary conditions. The textures are discussed in the light of the helical structure of the TGBA* phas…
Adsorption of NO on Co-ZSM-5 leads to formation of Co2+(NO)2 dinitrosyls [νs(NO) at 1895 cm-1 and νas(NO) at 1812 cm-1], Co3+–NO linear species [ν(NO) at 1950 and 1937 cm-1] and NO+ occupying cationic zeolite positions [ν(NO) at 2133 cm-1]. The NO+ and Co3+–NO species are of low stability and can be removed by evacuat…
Tetrahedral pentaerythritol tetrabenzoates with semi-fluorinated alkyl chains have columnar liquid-crystalline phases with dramatically enhanced mesophase stabilities compared to the parent hydrocarbon derivatives.
A theoretical density functional study of the exchange coupling has been carried out for binuclear copper(II) compounds with oxamidate and related bridging ligands: oxalate, oxamate, ethylenetetraamidate, dithiooxamidate, dithiooxalate, tetrathiooxalate, bipyrimidine and bisimidazole. Model calculations have been used…
The rutile TiO2(110) (1×1) surface is considered the prototypical ‘well-defined’ system in the surface science of metal oxides. Its popularity results partly from two experimental advantages: (i) bulk-reduced single crystals do not exhibit charging, and (ii) stoichiometric surfaces, as judged by electron spectroscopie…
The rare earth vanadate TbVO4, undergoes a crystallographic phase transition below 33 K induced by a cooperative Jahn-Teller effect. Twinning of the crystal occurs upon this transition from the tetragonal high temperature phase to the orthorhombic low temperature phase resulting in a domain structure. Single crystal x…
The synthesis of p-tert-butyltetramercaptotetrathiacalix[4]arene 1 bearing eight sulfur atoms was achieved in high overall yield (80%); the synthetic strategy used was based on the synthesis of p-tert-butyltetrathiacalix[4]arene 2, treatment of the latter with N,N-dimethylthiacarbamoyl chloride under mild conditions,…
The oxozirconium clusters Zr6O2(OPr)16(OOC–C10H6O)2(PrOH)2 and Zr10O6(OH)4(OOC–C6H4OH)8(OOC–C6H4O)8· 6 PrOH were obtained in quantitative yield, when Zr(OPr)4 was reacted with a 10-fold excess of 1-hydroxy-β-naphthoic acid and salicylic acid, respectively. The naphthoate-substituted cluster has a rather open structure…
The mesoporous silica molecular sieve MCM-41 can be obtained in a highly ordered form with various pore diameters if micelle packing is suitably controlled with a mixture of n-alkyltrimethylammonium bromide and n-alkyltriethylammonium bromide according to the length of the C12–C22 alkyl groups.
This paper summarizes the result of the questionnaire on current status of non-ceramic (composite) insulators in the world conducted by the Non-ceramic (composite) Insulators Technical Committee, Japan. Current use status, reasons for use, maintenance, failure occurrence and research activity of 16 responding utilitie…
The dependence of macropore formation in n‐silicon on substrate orientation was investigated. Samples were cut from a large crystal in various orientations between {100} and {111}. Macropores were obtained by electrochemical etching in diluted following standard techniques. The growth direction of the macropores was f…
The stochastic differential equations for a model of dissipative particle dynamics, with both total energy and total momentum conservation at every time step, are presented. The algorithm satisfies detailed balance as well as the fluctuation–dissipation theorems that ensure that the proper thermodynamic equilibrium ca…
Potassium sulfate was crystallized in a seeded batch cooling crystallizer with no temperature control or natural cooling. Above a critical seed concentration, uni-modal product of grown seeds was obtained even under a natural cooling mode with practically no nucleation. This ideal growth of seed crystals is contrary t…
The new [Ti17O24(OPri)20] cluster 1, that can be described as a non-charged lacunar super-Keggin complex, adopts a pseudo-D2d symmetry as established by X-ray diffraction and solution NMR studies.
Novel subphthalocyanines with long thioalkyl chains exhibit hexagonal columnar mesophases at room temperature; their inherent first hyperpolarizability values (β) measured by hyper-Rayleigh scattering (HRS) with fluorescence suppression are (189 ± 30) × 10–30 esu at 1300 nm.
[Ethylpyridinium][Ni(mnt) 2 ] has been prepared by electrochemical oxidation of the corresponding dianionic salt. The X-ray structure has been determined. Three different environments were observed for the paramagnetic anions with two in a stacking mode and one approximately orthogonal to the stack. The stacking showe…
A terpy-functionalised phospholipid has been incorporated into lecithin vesicles and iron(II)-directed aggregation processes have been studied.
Single crystals of complexes [{Mn(dmbpy)(N3)2}n] 1 and [{Cu(dmbpy)(N3)2}n] 2 (dmbpy = 4,4′-dimethyl-2,2′-bipyridine) were obtained from aqueous solutions containing 4,4′-dimethyl-2,2′-bipyridine, metal ions and sodium azide, and their structures determined by X-ray diffraction methods. The structure of 1 is a neutral…
A protein with a low molecular mass of 6027 was purified from cocoon shell of silkworm, Bombyx mori. Two-dimensional polyacrylamide gel electrophoresis (2D/PAGE) resolved this protein into a single spot with pI 4.3 and Mr 6000. Amino acid sequence analysis revealed that this protein consists of 55 amino acids, six of…