Materials Literature
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The synthesis, photophysical properties and singlet oxygen yields of a range of polyether substituted metallo and free-base phthalocyanines are reported and discussed in the context of the potential use of these compounds as alternatives to haematoporphyrin derivatives (HpD) in the photodynamic therapy (PDT) of cancer…
Abstract The volatility behavior of perfume compounds in poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide) copolymer was investigated by means of dynamic and static headspace analyses. Suppression of the volatility of perfume compounds by EO 105 PO 27 EO 105 copolymer was markedly greater than by polyeth…
Nitrogen atom transfer from salen-derived nitridomanganese(V) to manganese(III) Schiff-base complexes occurs under aerobic conditions in solution at room temperature. A mechanism involving chloride dissociation followed by the formation and decay of a binuclear μ-nitrido-activated complex accounts satisfactorily for t…
Optical interference coatings have been designed by using combinations of wavelets (fully apodized sine-wave refractive index groups). Like a single-line rugate filter, a single wavelet produces a stop band without harmonics and, in addition, has no sidelobes. The rules for combining wavelet refractive index structure…
Transferable potentials have been derived by computer modelling of the series of higher titanium oxides, from Ti 2 O 3 (with Ti 3+ ions) to TiO 2 (with Ti 4+ ions), and including the lower members of the series of phases, Ti n O 2n-1 , which have mixed oxidation states; some of these are described as crystallographic…
The first example of a spin-crossover iron(II) compound with a large negative third-order polarizability, associated with an instantaneous electronic response, is reported; magnetic measurements show that this compound, cis-bis(thio-cyanato)bis[N-(2-pyridylmethylene)aminobip henyl]iron(II), characterized by X-ray stru…
Abstract To predict B behavior in soils and its influence on plants, it is crucial to understand the mechanisms of B sorption by mineral phases. Because B reacts with clay minerals and Al and Fe oxides, it should also sorb to poorly crystalline aluminosilicates such as allophane. Boron sorption, with and following all…
The effectiveness of anti-cancer drug therapies is often limited by the difficulty of achieving drug delivery throughout solid tumors. Mathematical models permit an analysis of the factors leading to inadequate drug delivery to tumors and can suggest strategies for improving delivery. An overview is given of key facto…
Melt polymerisation of N-acryloyl-1,2-diaminoethane hydrochloride gives the hyperbranched hydrochloride salt analogues of Tomalia’s poly(amidoamine) dendrimers, for which spectroscopic analysis establishes a branching ratio close to one.
Self-assembled ordered cetyltrimethylammonium bromide (CTAB) is used as a template for the synthesis of mesoporous silicoaluminophosphates with varying Si/Al ratio.
Recently a mode coupling theory for the dynamics of solutions and melts of entangled linear chain polymers has been developed. We report the extension of this approach to macromolecular architectures different from linear chains. Specifically, this work addresses recent experimental findings on melts of ring shaped po…
Millimetre-sized mesoporous silica spheres, the sizes of which could be controlled by the mixing speed of the preparation solution, have been prepared directly from the reaction of tetraethoxysilane with tartaric acid in cyclohexanol by the sol–gel process. The silica gel spheres calcined at 400 °C showed specific sur…
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…