Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Straightforward Synthesis of 3,4-DifluoropyrroleEric K. Woller, Valeriy V. Smirnov, and Stephen G. DiMagnoView Author Information Department of Chemistry, University of NebraskaLincoln, Lincoln, Nebraska 68588-0304 Cite this: J. Org. Chem. 1998, 63, 16, 5706–5707Publication D…
The trinuclear [Gd(3)(H(-)(3)taci)(2)(H(2)O)(6)](3+) complex has been characterized in aqueous solution as a model compound from the point of view of MRI: the parameters that affect proton relaxivity have been determined in a combined variable temperature, pressure, and multiple-field (17)O NMR, EPR, and NMRD study. T…
Density and Brillouin-scattering measurements of hydrous andesite glasses at ambient conditions showed that dissolved water has a concentration-independent partial molar volume of 12 +/- 0.5 cubic centimeters per mole and a bulk modulus of 18 +/- 3 gigapascals. Dissolved as hydroxyl ions or as molecular water, water h…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Application of the First Chiral and Highly Lewis Acidic Silyl Cationic CatalystMogens Johannsen, Karl Anker Jørgensen, and Günter HelmchenView Author Information Center for Metal Catalyzed Reactions Department of Chemistry, Aarhus University DK-8000 Aarhu…
[Co(bpy)3]3+ and ClO4- ions occupy the vacancies of the chiral 3-dimensional oxalate-bridged [Co2(ox)3]2- net in the compound [Co(bpy)3][Co2(ox)3]ClO4 (1). Magnetic studies for 1 and the isostructural [M(bpy)3][Co2(ox)3] [M = Fe (2) and Ni (3)] complexes show the occurrence of weak ferromagnetism in 1 (Tc = 9.0 K) and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCones and Tubes: Geometry in the Chemistry of CarbonThomas W. EbbesenView Author Information ISIS, Louis Pasteur University, 4 rue Blaise Pascal, 67000 Strasbourg, France, and NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540 Cite this: Acc. Chem. Res.…
A general procedure for ecological and economic assessment during process design is presented. General objective functions to be used in the integrated development of fine chemical processes are defined. These are intended to accompany and guide process design from the very early design stages onward. The method uses…
The crystal structures of AuCN and AgCN have been determined by powder neutron diffraction measurements. The structure of AuCN consists of rows of linear AuCN chains parallel to [001] with alternating long Au-C = 2.06(2) and short Au-N = 1.82(2) Å. The Au atoms form sheets and are bonded to 6 other Au atoms at a dista…
We have synthesized [Pt(CN- iso -C 3 H 7 ) 4 ][M(CN) 4 ] (M = Pt, Pd) and studied their reversible hydration and sorption properties with UV−vis, FT-IR spectroscopy, and X-ray diffraction. Powder diffraction studies show that anhydrous [Pt(CN- iso -C 3 H 7 ) 4 ][Pt(CN) 4 ] and [Pt(CN- iso -C 3 H 7 ) 4 ][Pd(CN) 4 ] cry…
We study the Landau model for uniaxial incommensurate-commensurate systems of the I class by keeping Umklapp terms of third and fourth order in the expansion of the free energy. It applies to systems in which the soft mode minimum lies between the corresponding commensurate wave numbers. The minimization of the Landau…
This book is a comprehensive introduction to the mechanical properties of ceramics, and is designed primarily as a textbook for undergraduate and graduate students in materials science and engineering. Over the past 25 years ceramics have become key materials in the development of many new technologies as scientists h…
Two types of crosslinked polyurethanes (PU) have been synthesized: (a) PU crosslinked by metal ions (Cu2+ and Co2+), and (b) PU crosslinked by the complexes of metals with crown ether. Using X-ray scattering under small and wide angles the peculiarities of the structure of networks have been investigated. It was found…
The electronic energy-band structure for ${\mathrm{RbLaNb}}_{2}{\mathrm{O}}_{7},$ which is closely related to the layered perovskite niobate superconducting ${\mathrm{KCa}}_{2}{\mathrm{Nb}}_{3}{\mathrm{O}}_{10}$ and metallic ${\mathrm{KLaNb}}_{2}{\mathrm{O}}_{7}$ with Li intercalation, has been calculated by using the…
The temperature dependence of the Soret band of various metal-octaethylporphyrins [i.e., Ni(II), Cu(II), and Pd(II)] dissolved in the glass-forming mixture 50% (v/v) isopentane/ethyl ether in the temperature range 300−40 K was studied. Co(II)-octaethylporphyrin dissolved in dichloromethane was also investigated in the…
Attempts have been made to synthesize polyphosphazenes with pendent tertiary amino side units via macromolecular substitution. Incorporation of −OCH 2 CH 2 N(CH 3 ) 2, −OCH 2 CH 2 OCH 2 CH 2 N(CH 3 ) 2, and −NHCH 2 CH 2 N(CH 3 ) 2 groups was studied. Polymers in which all the side groups consisted of one type of aliph…
The response to plate impact loading of three aluminas with varying glass content and porosity has been investigated. Spall strengths have been shown to be dependent on the amplitude and duration of the compression pulse which precedes the tensile loading, but insensitive to the rate of release. Some tensile strength…
The ionic conductivity of glassy, fast-ion-conducting materials can show non-Arrhenius behavior and approach saturation at sufficiently high temperatures [J. Kincs and S. W. Martin, Phys. Rev. Lett. 76, 20 (1996)]. The Ngai coupling model was soon applied to explain some of these observations [K. L. Ngai and A. K. Riz…
The results of an infrared spectroscopic characterization of poly(vinyl cinnamate) (PVCIN) and its blends with poly(4-vinyl phenol) (PVPh) are reported before and after photo-crosslinking the PVCIN by exposure to UV radiation. The purpose of this article is to demonstrate methodology, and it is shown that quantitative…
Photoacoustic and Raman spectroscopy as well as photoluminescence (PL) measurements have been used to investigate the effect of band-gap widening in porous GaP. A correlation between a blueshift of the absorption edge observed during photoacoustic measurements, accompanied by PL emissions in the blue and ultraviolet r…
The electronic structure and properties of ferromagnetic mixed–valence manganites with the perovskite structure are briefly reviewed. The importance of disorder–induced localization is emphasized, and it is proposed magnetic disorder is effective in this sense on three different length scales. First, spin disorder on…