Materials Literature
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CeO2–ZrO2 aerogels (prepared by supercritical drying of the precursor hydrogels produced by either co-precipitation or deposition-precipitation) have been characterised in order to elucidate the effect of the structural homogeneity on the stability of their total surface areas at high temperatures. Co-precipitated aer…
The synthesis and detailed structural characterization of phthalocyanine derivatives substituted by six dodecyloxy side chains and a single poly(oxyethylene) moiety are described. All of the materials possess columnar mesogenic properties. The phthalocyanines attached to short poly(oxyethylene)s possess an ordered hex…
6,6′-Diamino-2,2′-bipyridine (1a) has been found to exhibit a strong fluorescence in the near-UV region. Some amino and/or chloro substituted bipyridines (bpys) have been synthesized and studied to show that only 6-amino-substituted derivatives exhibited a strong emission. The emission of 6-amino-6′-chloro-bpy (3a) wa…
A combined experimental and theoretical study was carried out to analyze the effect of residual thermal stresses on the interfacial bonding in particulate metal-ceramic matrix composites, in particular, ductile phase toughened ceramics. The metal-ceramic microstructure studied is a two phase NiAl2O3 system produced by…
The crystal structures of four [dicyanoargentato(I)]cadmium(II) complexes with the mixed ligation of imidazole (imH: C 3 H 4 N 2 ) or N -methyl- or 2-methylimidazole ( N -Meim or 2-MeimH: C 3 H 6 N 2 ) on the cadmium(II), [Cd(imH) 4 {Ag(CN) 2 } 2 ] ( 1a ), [Cd(imH) 5 {Ag(CN) 2 }][Ag(CN) 2 ] ( 1b ), [Cd( N -Meim) 4 {Ag…
This Handbook/Databook contains hundreds of completely updated figures and tables. The authors are among the most prominent in the field - and each is a specialist in the subject matter of his peer reviewed contribution.
The compound CsTh(2)Te(6) has been synthesized at 800 degrees C by the reaction of Th with a Cs(2)Te(3)/Te melt as a reactive flux. The compound crystallizes in the space group -Cmcm of the orthorhombic system with two formula units in a cell of dimensions a = 4.367(2) Å, b = 25.119(10) Å, c = 6.140(3) Å, and V = 673.…
The reaction of octaethylporphyrin iron(III) chloride with potassium crown ether (18-crown-6) nitrite in N-methylpyrrolidone-1% acetic acid under argon generates the iron(III) nitrite salt (PFeNO(2)). The latter is a unique and selective oxygen atom transfer reagent. The reaction of a broad range of substrates (S) pro…
The electromigration-induced ionic drift velocity and critical length-current density product, (jl/sub c/) of Cu thin film conductors, were measured using the Blech-Kinsbron edge-displacement technique. Unencapsulated Cu edge-displacement segments on TiN conductors were stressed in vacuum at a modest current density o…
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…