Materials Literature
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Latex prepared from 91 : 5 : 4 wt % vinylidene chloride-acrylonitrile-methyl acrylate monomer mixture by seeded semicontinuous emulsion polymerization was investigated for a change in minimum film-formation temperature (MFFT) during storage, with focus placed on polymer crystallinity in the dispersed state. MFFT rose…
We report the first example of intramolecular excimer formation in supramolecular trichromophoric systems resulting from the metal-directed self-assembly of chromophore-labeled ligand molecules. The trichromophoric gallium(III) chelate, ( 1 ) 3 Ga, shows an intense pyrene excimer fluorescence emission in acetonitrile,…
Peroxynitrite (ONOO - ) is a major cytotoxic agent that has been implicated in a host of pathophysiological conditions; it is therefore important to develop therapeutic agents to detoxify this potent biological oxidant, and to understand the modes of action of these agents. Water-soluble iron porphyrins, such as 5,10,…
The phase behavior of KDP, the principal material for manipulating laser radiation, has been the source of controversy and consternation. The deconvolution of the changes during heating due to genuine structural phase transitions from decomposition reactions previously has not been accomplished. Three newly characteri…
Titration curves show that the layered double hydroxide Zn2Cr(OH)6Cl, unlike Zn2Fe(OH)6Cl (shown) or Zn2Al(OH)6Cl (not shown) forms directly from solution, without the intermediacy of “MIII(OH)3”, when a mixture of metal chlorides is treated with base. Co(II), Ni(II), and Cu(II) behave similarly. Spectroscopic and tit…
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…