Materials Literature
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Dielectric measurements of a polymerizing amine/epoxy system were carried out in the frequency interval ${10}^{3}$--${10}^{10}$ Hz. The vitrification of the system due to the increase of connectivity was analyzed by measuring the change of the shape parameters of the main relaxation, m and n, during the reaction; the…
The lattice cluster theory (LCT) is used to study the influence of structural and energetic asymmetries on the miscibilities of binary polyolefin blends. The theory describes monomer molecular structures by using a united atom model for the polyolefins, where each CH n united atom group occupies a single lattice site…
Polymethylhydrosiloxanes (PMHSs) crosslinked with hexa-l,5-diene or hexane-l,6-diol have been considered as potential precursors for Si–C–O systems. Their pyrolysis under an argon flow has been investigated mainly by 29Si MAS NMR spectroscopy. The two systems, with similar C/Si but different O/Si ratios, show differen…
Some new synthetized pyrazole organic-type compounds have been tested as inhibitors for the corrosion of iron in 1M HCl by weight-loss and electrochemical polarization methods. Both techniques gave the same order of inhibition. The compound l,3-bis(3' chloromethyl-5'-methyl-1'-pyrazolyl)propane (Inh.9) was the better…
A new synthetic route to metallo-1,2-enedithiolates is presented. The addition of 1 equiv of the α-bromo ketones Ar-C(O)CHXR (X = Br) {Ar = 2-quinoxaline, 2-, 3-, or 4-pyridine, Ph, Cl−Ph, and pyrene (R = H); Ar = 2-quinoxaline (R = Me); and Ar = R = Ph} to Cp 2 Mo(SH) 2 followed by the addition of base results in the…
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…
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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…