Materials Literature
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Irradiation with visible light of a mixture of an alkene in degassed aqueous acetonitrile containing tetraphenylporphyrinantimony(V) as a sensitizer, methylviologen as an electron acceptor, and hydroxide ion, induced epoxidation of the alkene accompanied by hydrogen evolution, with water acting as the electron donor.
The new complexes [FeL12] ClO4(HL1= tridentate Schiff base formed by 1 : 1 condensation of o-aminophenol and pyridine-2-carbaldehyde) and [FeL22] NCS ( HL2= tridentate Schiff base formed by 1 : 1 condensation of 8-aminoquinoline and salicylaldehyde) were synthesized. The spin-crossover behaviour between S=½ and 5//2 w…
A set of radiative wave equations including all four Stokes parameters is derived for vector electromagnetic wave propagation in dense nontenuous media. The derivation is based on the quasi-crystalline approximation with coherent potential on the first moment of the field, and the modified ladder approximation on the…
Brief case studies of the problems in identification of a wide variety of ethnographic and archaeological fibers are given. The strategy of identification varied with the purpose (choice of treatment, assessment of damage or identification of its cause, or authentication) but most of all with the condition of the fibe…
Abstract Fourier Transform Mechanical Analysis (FTMA) has been used to study the strain amplitude dependent nonlinear dynamic mechanical properties of two elastomer compounds, nitrile rubber (NBR) and Neoprene, at various frequencies up to 750 Hz. Basic theory and experimental results are presented for one‐dimensional…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHindered internal conversion in rigid media. Thermally nonequilibrated 3IL and 3CT emissions from [Cu(5-X-phen)(PPh3)2]+ and [Cu(4,7-X2-phen)(PPh3)2]+ systems in a glass at 77 KDominick J. Casadonte Jr. and David R. McMillinCite this: J. Am. Chem. Soc. 1987, 109, 2, 331–337P…
This paper reviews the state-of-the-art experimental work performed in several countries with respect to the acceptance criteria established for the emergency core cooling (ECC) in a loss-of-coolant accident (LOCA) of light water reactors (LWRs). It covers in detail oxidation, embrittlement, plastic deformation, and c…
Abstract Two distinctly different mechanisms that lead to growth rate dispersion have been observed experimentally. One of the mechanisms involves an initial growth rate distribution among nuclei, while the other allows crystal growth rates to fluctuate. The model formulated in the present work includes both phenomena…
Recent spectroscopic results obtained on UO2 single crystals are reviewed. Special emphasis is put on the various optical spectroscopies such as reflectivity, absorption, Faraday rotation, magnetic circular dichroism and Raman scattering, but also X-ray photoemission, bremsstrahlung isochromat spectra and neutron scat…
At room temperature UO2 assumes the fluorite structure with both uranium and oxygen atoms vibrating isotropically about their equilibrium positions. At higher temperatures (> 400 K) this model must be modified to account for the anharmonic, anisotropic contribution of the oxygen atoms to the Bragg intensities. Up to 1…
The marine adhesive polydecapeptide (Ala-Lys-Pro-Ser-Tyr-Hyp-Hyp-Thr-Dopa-Lys)n(n ca. 10) has been synthesized by coupling reactions, followed by polycondensation. The O-benzyl, O,O′-dibenzyl, and N-ε-2-chlorobenzyloxycarbonyl groups were used to protect the side chains of Ser, Tyr, Hyp, Thr, Dopa, and Lys. The prote…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated molecules. 67. Formation and structure of cyclic five-coordinated antimony derivatives. The first square-pyramidal geometry for a bicyclic stiboraneRobert R. Holmes, Roberta O. Day, V. Chandrasekhar, and Joan M. HolmesCite this: Inorg. Chem. 1987, 26, 1, 157…
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Oxygen self-diffusion data in the nuclear oxides UO2, ThO2 and PuO2 are summarized. The impact of such data on the understanding of defect structures is emphasised, and remaining inconsistencies which call for further clarification of experimental and/or theoretical work are pointed out.
Abstract The theory of MCSCF and CI energy derivatives with respect to geometrical variations is briefly reviewed with special attention given to the MCSCF and MRCI energy gradients. A computational procedure is proposed for MRCI energy gradients that does not require the solution to any “coupled‐perturbed MCSCF ” equ…
The catalytic properties of some mixed zirconates with the pyrochlore or fluorite structure have been investigated using CO oxidation as the test reaction. The presence of terbium ions, leading to mixed conductivity, and the extent of pyrochlore ordering affect the kinetic behaviour and the catalytic activity of the i…
Metal-free and copper(II) 1,4,8,11,15,18,22,25-octa-alkyl phthalocyanines have been prepared with alkyl chain lengths between C4 and C10; all except those with C4 and C5 chains show thermotropic liquid crystalline behaviour with one or more mesophases.
A model is presented that determines the effect of oxygen and helium on the energies of the common vacancy-cluster configurations, namely the void, dislocation loop and stacking-fault tetrahedron. Representative calculations are given for the case of irradiated copper. The presence of oxygen tends to enhance the stabi…
The synthesis, colour, and constitution of methine dyes formed by condensation of benzaldehydes and nitrosobenzenes with dicyanovinyl analogues of indane-1,3-dione have been investigated. 3-Dicyanovinylindan-1-one (3) and 1,3-bisdicyanovinylindane (5) give magenta (λmax.ca. 560 nm) and blue (λmax.ca. 600 nm) dyes resp…
This work reviews and discusses the data on the various thermodynamic properties of manganese and molybdenum available through March 1985. These include heat capacity, enthalpy, enthalpy of transitions and melting, vapor pressure, and enthalpy of vaporization. The existing data have been critically evaluated and analy…