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Dialkyl fumarates with bulky ester substituents were found to homopolymerize easily in the presence of 2,2′-azobisisobutyronitrile. Among these fumarates, diisopropyl fumarate (DiPF) homopolymerized with the above initiator (20mmol/1) in bulk at 40∼60°C to give homopolymers with number-average molecular weight of 70 0…
Molecular field theory is used to determine the temperature-composition phase diagram and component order parameters of binary mixtures of nematic liquid crystals. A rotationally invariant form of the Maier-Saupe pseudopotential is generalised to two-component mixtures; the parameters of the theory are the ratios of t…
Shells from several Mollusca collections have been examined. Efflorescence—white or grey crystalline salts on the exterior or, to a lesser extent, the interior of the shells—is a widespread problem and occurs in many shell species, both land and sea shells. The efflorescence has been identified by means of several tec…
Drei linear verbundene Cu ⊕ ‐Ionen , die von drei parallelen N 5 ‐Zickzackketten derartig koordiniert werden, daß jedes metall‐Ion trigonal‐planar von N‐Atomen umgeben ist, liegen im Pentaazadienid‐Komplex 1 vor. Die roten Kristalle von 1 zeigen schwachen Paramagnetismus; die Cu‐Cu‐Abstände in den ketten sind die kürz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic considerations in the photodisproportionation of .mu.-oxo-bis((tetraphenylporphinato)iron(III))Mark W. Peterson, David S. Rivers, and Robert M. RichmanCite this: J. Am. Chem. Soc. 1985, 107, 10, 2907–2915Publication Date (Print):May 1, 1985Publication History Pub…
Droplets of uncoated molten Si (0.4–0.8 mm diameter) have been undercooled 250 °C. Ge droplets of similar size have been undercooled 280 °C in a B2O3 flux. The observed nucleation onset temperatures of both Si and Ge droplets are at or below the predicted amorphous phase melting temperatures Ta1. The solidified struct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the psammaplysinsDeborah M. Roll, Clifford W. J. Chang, Paul J. Scheuer, George A. Gray, James N. Shoolery, Gayle K. Matsumoto, Gregory D. Van Duyne, and Jon ClardyCite this: J. Am. Chem. Soc. 1985, 107, 10, 2916–2920Publication Date (Print):May 1, 1985Publicati…
Abstract Low antiferromagnetism of μ-alkoxo-μ-carboxylatodicopper(II) complexes were reasonably explained in terms of the orbital countercomplementary effect based on Hoffmann’s theory for superexchange interaction.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxochromium compounds. 2. Reaction of oxygen with chromium(II) and chromium(III) porphyrins and synthesis of a .mu.-oxo chromium porphyrin derivativeDavid J. Liston and Bruce O. WestCite this: Inorg. Chem. 1985, 24, 10, 1568–1576Publication Date (Print):May 1, 1985Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved procedure for the tungstate-catalyzed epoxidation of .alpha.,.beta.-unsaturated acidsKenneth S. Kirshenbaum and K. Barry SharplessCite this: J. Org. Chem. 1985, 50, 11, 1979–1982Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Publis…
The selection of an optimal parametric angle θ describing a closed magnetic flux surface is considered with regard to accelerating the convergence rate of the Fourier series for the Cartesian coordinates x(θ,φ)≡R−R0 and y(θ,φ)≡Z−Z0. A system of algebraic equations, which are quadratic in the Fourier amplitudes of x an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver particles on stochastic quartz substrates providing tenfold increase in Raman enhancementM. Meier, A. Wokaun, and T. Vo-DinhCite this: J. Phys. Chem. 1985, 89, 10, 1843–1846Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published ini…
We discuss the ground-state phase diagram of the molecular-crystal model for electron-phonon interactions in the presence of on-site (U) and nearest-neighbor (V) electron-electron interactions in the half-filled-band sector. The system is analyzed as a function of the phonon frequency (\ensuremath{\omega}), electron-p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization and reactions of (C5H5)(CO)2Fe:C(CH3)2+ and (C5H5)(CO)2Fe:CH-CH:C(CH3)2+Charles P. Casey, William H. Miles, and Hideyuki TukadaCite this: J. Am. Chem. Soc. 1985, 107, 10, 2924–2931Publication Date (Print):May 1, 1985Publication History Published o…
Abstract Since 1963, production of all epoxy esters has ranged from 60 to 150 million lb annually, a steady 7% of the 1 to 2 billion lb of annual plasticizer production. Growth rates in production averaged 4.3% for all plasticizers, 3.8% for all epoxy esters and 5.0% for epoxidized soybean oil (ESBO). ESBO accounted f…
Surface‐enhanced Raman scattering (SERS) has been used as a complementary in situ technique for electrochemical measurements in order to investigate five structurally related N‐heterocyclic molecules on copper. Their different abilities to act as corrosion inhibitors are discussed in view of structural information obt…
When Clostridium cellulolyticum was grown with cellulose MN300 as the substrate, the rates of growth and metabolite production were found to be lower than those observed with soluble sugars as the substrate. At low cellulose concentrations, the growth yields were equal to those obtained with cellobiose. The main ferme…
Replication functions of a bacteriophage P1 miniplasmid are carried on a 1.2-kilobase pair (kb) segment that can be subdivided into a 245-base pair (bp) replication origin and a 959-bp region that encodes a protein required for replication (RepA). The origin region contains five 19-bp direct repeats. By using primer e…
Two effects are of outstanding importance for the mechanical behaviour of polymer-additive mixtures, (a) the plasticizer effect and (b) an effect, which we shall refer to as the “β-suppression” effect: Additives can suppress the secondary (β-) relaxations of the polymer. The β-suppression effect is studied on a number…
Steadily growing, spatially periodic, two-dimensional cellular interfaces with groves up to 15 times longer than their wavelength are calculated by a novel finite-element method applied to the solutal model for solidification that includes diffusion in the solid. The deep cells are formed by either continuously decrea…