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The substitution pattern determines whether distilbenylazobenzene compounds 1 or their subsequent products, the dihydrocinnolines 2, are isolated in the cobalt-catalyzed solvent-free reaction of azo compounds with diphenylacetylene. For several derivatives a photochromic equilibrium exists between the two forms.
No bonding interactions exist between the three interpenetrating framework structures in 1, and all of the two-dimensional networks are constructed by coordinate linkages-these two principles describe the structure of 1 (shown schematically on the right). Compound 1 was prepared from K2[Cd(CN)4], Ag-NO3, and pyrazine…
Liquid-Crystalline behavior over a wide temperature range and reversible phase transitions are observed for the polymer network 1, which is held together by hydrogen bonds between benzoic acid and pyridyl units
Up to fourth-generation neutral phosphorus-containing dendrimers are prepared in good yields in the synthesis outlined here. The only byproducts are NaCl and H2O, and the products contain highly reactive functional groups along the periphery. The first-generation dendrimer is shown on the right.
Abstract The role of metalloenzymes in important biological transformations has attracted increasing attention over the past several decades. Of the many chemical transformations mediated by enzymes, few are as challenging as multielectron redox reactions. Recent studies have revealed a partial structural and mechanis…
Mechanisms of guanosine triphosphate (GTP) hydrolysis by members of the G protein alpha subunit-p21ras superfamily of guanosine triphosphatases have been studied extensively but have not been well understood. High-resolution x-ray structures of the GTP gamma S and GDP.AlF4- complexes formed by the G protein Gi alpha 1…
The ability to produce high quality films in an electron cyclotron resonance reactor is dependent on the gas distribution system. In an effort to understand gas distribution effects, a variety of gas ring injection systems were implemented during silicon nitride growth. Film refractive index, uniformity, and stress we…
The beam-bending method is very useful for the viscosity determination of glasses, but the time spent to run the measurement is usually very long. The present note describes the performance of an improved beam-bending viscosimeter at the support stand and loading rod to get the faster measurements of high viscosity gl…
Abstract The structure of perfluorinated ionomer membranes (Nafion®) incorporating large organic cations, tetraethylammonium (TEA+) and 1,1′-dialkyl-4,4′-bipyridinium cations (CnV2+, n = 3 and 8), is studied using small-angle X-ray scattering (SAXS). For TEA+- and C3V2+-form membranes, the SAXS maxima show the presenc…
Yellow zirconium silicate is a promising substitute for cadmium pigments used in plastics. However, the incorporation of zircon pigment in HDPE without loss of impact strength is required. By introducing the untreated pigment in the polymer, the impact strength reduces to 60% of the value for the unfilled polymer. Dif…
Abstract An experimental study was carried out to demonstrate the possibility of compatibilising blends of polyvinylidenefluride with minor amounts of fluorosilicone elastomer, thereby achieving better low temperature ductility without excessively reducing the melting point and degree of crystallinity of the fluoropol…
X-ray photoelectron spectroscopic (XPS) studies of inP surfaces subjected to a new method of hydrogen plasma treatment are reported here. The XPS analysis shows that the usually observed phosphorus loss can be reduced by the use of a 'sacrificial' inP immersed in the hydrogen plasmawith the test InP Sample kept away f…
Self-diffusion along the [112] Shockley parital dislocation pair (self-pipe-diffusion) in Au is studied with Nos\'e-Hoover molecular dynamics (MD) using the many-atom Ackland-Tichy-Vitek-Finnis model. We find the following formation energy difference between interstitials (i) and vacancies (v) at partial dislocations:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Reinvestigation of the Thermal Decomposition of Methylammonium NitrateWaspada Kurniadi and K. R. BrowerCite this: J. Org. Chem. 1994, 59, 18, 5502–5505Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September 1994…
The paper describes work being done in the modelling of transformers, concentrating on predicting the effects of the stray magnetic field as it relates to transient and non-sinusoidal conditions, with particular reference to traction, rectifier and other applications. Considerable progress has been made with steady-st…
The electromagnetic duality principle is used for transformer modelling. The proposed method is presented. The calculation complexity of the rectangular winding parameters is reduced using a conformal mapping method and the boundary element method. The model parameters are directly calculated from the physical geometr…
The orthorhombic - monoclinic phase transition at Tc=277. 1K in [N(CH3)4]2MnBr4 crystals have been studied by measuring dielectric constant along the a, b, and c-axes in the wide range of temperature from 350K to 10K. The anomalous parts of the dielectric constants due to the phase transition are found to show very an…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. D. Gotsis, H. C. Langelaan; Origins of nonlinear pressure profiles in the flow of nematic melt…
LARCTM-TPI is a linear aromatic polyimide that was developed at NASA Langley Research Center in the 1970's and subsequently licensed to Mitsui Toatsu Chemicals, Inc., (MTC) in Japan. This company has made it easier to process for use in application as a structural adhesive or as a composite matrix resin. The present f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergy Transfer from Metastable NF to Boron HydrideD. J. Benard, E. Boehmer, H. H. Michels, and J. A. Montgomery Jr.Cite this: J. Phys. Chem. 1994, 98, 36, 8952–8958Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 Se…