Materials Literature
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The molecular and solid-state electronic structures of metal-free phthalocyanine and a series of linearly benzoannulated phthalocyanines have been investigated using the valence effective Hamiltonian (VEH) quantum-chemical method. Geometry optimizations show that, from the molecular structure standpoint, phthalocyanin…
The effect of microstructures on the magnetic properties in the 6.5% Si-Fe alloy was studied. The alloy was subjected to two patterns of heat treatments, and the microstructures were observed by means of TEM. The alloy after an appropriate treatment has shown excellent soft magnetic properties, with the maximum permea…
The effect of alkali metal counterion type on the crystallization kinetics of sulfonated syndiotactic polystyrene with ion contents of 1.4 mol % was investigated. For crystallization temperatures less than 180 °C, the rate of crystallization was independent of counterion type. In contrast, for temperatures greater tha…
Crystals of the title compound exist as a green monoclinic phase [space group P21/c with a= 9.046(1), b= 19.615(2), c= 9.055(1)Å, β= 116.107(5)°, Z= 2] and a purple triclinic phase. The chromophore is both planar and centrosymmetric and its dimensions indicate a tendency towards a quinoidal structure with extensive de…
The solution and solid state structures of two octahedral Ru(II) complexes, cis,cis,cis-RuCl(2)(Me(2)SO)(2)(py)(Me(3)Bzm) (Me(3)Bzm = 1,5,6-trimethylbenzimidazole, py = pyridine) (1) and cis,cis,cis-RuCl(2)(Me(2)SO)(2)(Me(3)Bzm)(2) (2), were compared. 2, the subject of a preliminary report, is described in more detail…
Tetranuclear manganese(II) alkoxide complexes were prepared from the reaction of MnCl2, a β-diketone, and lithium alkoxide in alcohol. Single-crystal X-ray diffraction studies revealed the presence of a {Mn4(OR)4}4+ core structure with the metals occupying alternating vertices of a cube. The temperature-dependent magn…
A first-generation dendrimer, which consists of electron-deficient benzene and oxadiazole rings, forms π-stacks in solution as evidenced by NMR and vapour-pressure osmometry.
This Raman spectroscopic study on selenium incorporated in Nd−Y zeolite presents new aspects of the photochemistry of selenium. The formation of the Se 2 - radical anion has been established from its resonance Raman spectrum, consisting of ten almost equidistant bands between 328 and 3220 cm - 1 on the low-energy side…
The assembly of amphiphilic phenylacetylene macrocycles (PAMs), with molecular structures that vary in terms of the nature and orientation of their pendant functional groups, has been studied on a Langmuir−Blodgett trough and after transfer onto solid substrates. These monolayer films are of interest as two-dimensiona…
A series of 4,5-η 2 -Os(II)pentaammine-3-vinylpyrrole complexes are synthesized from the corresponding 1-methylpyrrole complex by an electrophilic addition at the β-carbon, C(3), of the pyrrole ring. Four independent synthetic routes to β-vinylpyrrole complexes are described, each introducing different functionality o…
Lack of an endothelial surface is the most important variable causing the relatively poor patency of synthetic bypass grafts. This study was designed to investigate the effect of endothelial cell seeding on small-diameter Dacron grafts seeded with microvascular endothelial cells from omentum, and to evaluate two metho…
Environmental scanning electron microscopy has been used to study ‘wet’ polymer latex films. Comparison of the results obtained by imaging in nitrogen and nitrous oxide gas and water vapour has provided insight into a variety of different contrast phenomena. Notably, it was found that edge definition and fine features…
Flow deformation and relaxation of mono- and bilayer domains of a thermotropic liquid crystal at the air−water interface have been studied by means of simultaneous application of extensional flow fields and Brewster angle microscopy measurements. In an extentional flow, mono- and bilayer domains are found to be distor…
The electronic structure and spectra of a family of nickel porphyrin complexes are analyzed using approximate density functional theory (DFT). The three complexes, Ni(OEP), Ni(OEP-C 4 SiMe 3 ), and Ni(OEP)(μ-C 4 )Ni(OEP) represent a logical increase in complexity starting from a simple metalloporphyrin. The spectra of…
Description STP 1270 features the latest information from the world's leading experts on how radiation impacts a wide range of metals. This extensive volume includes 68 peer-reviewed papers organized into 8 comprehensive categories: Modeling of Controlling Mechanisms -- 8 papers explore mechanisms controlling the beha…
Adsorption of CO, used as infrared molecule probe, was performed at room temperature or at low temperature (140 K), on either chlorine-free or chlorine-containing ceria, in order to investigate both the chlorine effect and the ceria reduction state. On ceria and Pd/ceria catalysts, chlorine acts as an electronegative…
The dihalide capped trinuclear nickel clusters Ni 3 (μ 3 -X) 2 (μ 2 -dppm) 3 (X = I ( 1a ), Br ( 1b ); dppm = Ph 2 PCH 2 PPh 2 ) were synthesized and converted to their respective monocations [Ni 3 (μ 3 -X) 2 (μ 2 -dppm) 3 ] + (X = I ( 1a + ), Br ( 1b + )) via a single electron oxidation. Clusters 1a and 1a + were cha…
A phenomenological rheological model was developed to describe the molecular interactions and predict the mechanical properties of fish myofibrillar protein-based films, irrespective of their thickness. The model was built of a parallel array of Maxwell and elastic elements in which a fracture element was introduced.…
Cross-linking of the seed latex polymer introduces elastic forces into the thermodynamic analysis of the morphology of composite particles. By determining the elastic storage energy necessary to maintain a deformation within the seed latex particle (as in an occlusion of second-stage polymer), it can be combined with…
A novel method of preparing thermally stable thin films with intrinsic second-order nonlinear optical activity is described. Design and synthesis yielded new ferroelectric bifunctional liquid crystalline acrylate monomer mixtures with a fast electro-optical response in the chiral smectic C (SmC*) phase. The ferroelect…