Materials Literature
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The synthesis, X-ray structural characterization, and Mössbauer and magnetic properties of the two pentanuclear complexes [Fe 5 (μ 3 -F) 2 (XDK) 2 (L) 4 (O 2 CPh) 4 ], where L = pyridine (py) or N -methylimidazole ( N -MeIm), are described. Reaction of [Fe(H 2 O) 6 ](BF 4 ) 2, the deprotonated dinucleating dicarboxyla…
Methyltrioxorhenium has been supported on silica functionalized with polyether tethers; in the absence of an organic solvent, this catalytic assembly catalysed the epoxidation of alkenes with 30% aqueous H2O2 in high selectivity compared to the ring opening products observed in homogeneous media.
Mesoporous silica (FSM-16) catalyses metathesis of propene under photoirradiation at a higher activity than amorphous silica whereas microporous silica crystals (silicalite-1) do not catalyse the reaction.
The formation of a black patina on copper in humid air containing traces of SO 2 was investigated using on‐line analysis of SO 2 and corrosion product characterization (x‐ray photoelectron spectroscopy, Fourier transform infrared absorption spectroscopy, x‐ray diffraction, and quantitative analysis of sulfite). In hum…
SnO 2 films have been succesfully prepared by chemical vapour deposition (CVD) by reaction of SnCl 2 with O 2 and a value of the activation energy of 58 kJ mol -1 has been measured. The temperature range 450–500 °C has been found to be the optimum for the reaction with resistivities of the films of 9×10 -4 Ω cm on sil…
A molecular clip is described which binds aromatic guests by an induced fit mechanism. It contains twelve long aliphatic chains and can evoke liquid-crystalline properties in a variety of molecules, including polymers and porphyrins, by a process of molecular recognition.
The problem for assessment of similarity between dissolution profiles of two drug products is considered. The commonly used classical methods including model-dependent and model-independent approaches are reviewed. Most methods encountered the difficulties of no well-defined equivalence limits and the correlation betw…
We have prepared nylon 11 thin films containing individually isolated Au particles with various volume fractions ranging from 1.7 to 8.3% by means of a consecutive evaporation followed by heat treatment. The films obtained were characterized by TEM, XPS and UV–VIS absorption spectroscopy. Au particles were homogeneous…
Enhanced electrochemical charge transport rates in a conjugated metallopolymer formed by complexation of [Ru(2,2′-bpy) 2 ] 2+ moieties to donor N-atoms in the backbone of a benzimidazole-based polymer provide strong evidence for electronic communication between metal centres.
Fourier-transform infared (FT-IR) time-resolved spectroscopy was used to study the segmental mobility of two low molecular weight nematic liquid-crystals ( p -cyanophenyl p -( n -hexyl)benzoate, 6CPB, p -cyanophenyl p -( n -heptyl)benzoate, 7CPB) and a nematic liquid crystalline polymer (poly[ p -( n -hexyl)( p -(cyan…
Due to the lack of detailed information surrounding the inhibition phenomenon in hot-dip galvannealing, and the microstructure and morphology of the Fe-Al inhibition compounds, this study was initiated to investigate the inhibition layer formed under the low bath Al content, short-dipping-time conditions typical of co…
Tirapazamine (SR 4233; 3-amino-1,2,4-benzotriazine-1,4-di-N-oxide) is a bioreductive agent exhibiting up to 200 x greater toxicity for hypoxic cells as compared to oxygenated cells. In murine studies, a selective increase in tumor kill was observed when tirapazamine was coadministered with other agents, notably cispla…
pH is critical in the formation of new mixed-valence vanadium oxides, NMe 4 V 3 O 7 , NMe 4 V 4 O 10 and the dioxide Li x V 2 O 4 ·H 2 O, with NMe 4 + cations or water molecules residing between vanadium oxide layers.
The dielectric permittivity between 500 Hz and 1 GHz and pyroelectric properties of (${\mathrm{ND}}_{3}$ ${\mathrm{CH}}_{2}$ COOD)${\mathrm{D}}_{2}$ ${\mathrm{PO}}_{3}$ (DGPI) single crystals in the vicinity of ferroelectric phase transition (322 K) are measured. The spontaneous polarization along the b axis is found…
Ferrimagnetic coupling in a mesogen is reported for the first time for the compound Mn III [((OC 12 H 25 ) 4 TPP)](TCNE) · 2 touluene (where TPP = tetraphenyl porphyrin, TCNE – tetracyanoethylene), which displays liquid crystal properties above 381 K and ferrimagnetic properties below 21.4 K. The results from differen…
Partial table of contents: Polyacetylene (S. Curran, et al.). Electrically Conductive Polyacetylene Copolymers (L. Leung). Synthesis and Properties of Processable Polythiophenes (K. Kaeriyama). Molecular Conductive Materials: Polythiophenes and Oligothiophenes (S. Hotta). Polythiophene and Polypyrrole Copolymers (R. G…
The scope, usability, limitations and predictive power of four modeling methodologies are analyzed in this paper: mathematical models, empirical models, computer simulation models, and artificial neural network models. The predictive power of each of the four is estimated by comparing predicted yarn strength with expe…
Polyaniline emeraldine base 1 can be easily modified by pyrrolidine and other nucleophiles, e.g. piperidine, morpholine, alkane-1-thiols and mercaptoacetic acid, presumably via a concurrent reduction and substitution mechanism.
The second-order nonlinear optical (NLO) and electronic properties of stilbenes (CC bridge), benzylideneanilines (CN and NC bridges) and azobenzenes (NN bridge) containing either an N,N-dimethylamino donor and/or a nitro acceptor were investigated using EFISH, UV spectroscopy, cyclic voltammetry and PPP/SCF calculatio…
The reaction of thulium(II) iodide with 2 equiv. of lithium naphthalenide in dme (dme = 1,2-dimethoxyethane) yields a binuclear thulium(III) complex with one bridging and two terminal dianions of naphthalene [{Tm(dme)} 2 (η 2 -C 10 H 8 ) 2 (η 2 -η 4 :η 4 -C 10 H 8 )] 1.