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The X-ray procedure for estimation of the degree of crystallinity in digoxin is based upon measurement of the total X-ray scattering and the scattering from crystalline regions of the drug. The infrared procedures are based upon measurement of the peak height ratios, 1775/1618 and 3095/1618 cm-1. Correlation between r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition metal dimers. 11. Structural and magnetic characterization of [Ni2(tren)2(C6O4Cl2)](BPh4)2 and [Cu2(Me5dien)2(C6O4Cl2)](BPh4)2. Magnetic exchange interactions propagated by the dianions of 2,5-dihydroxy-1,4-benzoquinonesCortlandt…
Titanium‐doped α‐Al 2 O 3 exhibits a high‐temperature conductivity which is ionic at high oxygen pressures and electronic at low oxygen pressures. Both are isotropic. The temperature dependence of conductivity under conditions where equilibrium with the atmosphere is not maintained indicates both the position of the e…
The high resolution photoluminescence spectra reported here reveal new details of the structure of both bound excitons and bound multiexciton complexes in donor and acceptor doped Si. The bound exciton and bound multiexciton complexes in Si containing P impurities are found to have excited states, as was postulated in…
Abstract The interaction of the nitrate, sulfate, and carbonate anion with aluminum hydroxide gel was studied by infrared spectroscopy. A lowering in the anion symmetry due to the interaction with the aluminum hydroxide surface was observed. Evidence suggests that the nitrate anion interaction is outside of the coordi…
Abstract The low electrical resistance of vulcanizates loaded with conductive carbon blacks in a given particle size range is cause by the low density of the particles, high structure, or both. In addition, the smaller the particle size of the black, the lower the resistivity. The same factors also cause high modulus…
Abstract The reaction of ethylene glycol, 1,4‐butanediol, 1,6‐hexanediol, 3,6‐dioxaoctane‐1,8‐diol (triethylene glycol), poly(ethylene oxide)s with M̄ n = 300,1000 and 3000, or with poly(propylene oxide)s with M̄ n = 425 and 2000 in excess with AIBN leads to the corresponding bis(hydroxyalkyl) 2,2′‐azodiisobutyrates (…
Adsorption of ions from aqueous solutions into pores, as narrow as 3.7Å was observed, using linear sweep cyclic voltametry. The conductivity of the solution in pores of less than 7Å diameter is several orders of magnitude lower than that of a free solution in contact with the carbon electrode. It seems negligibly slow…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron Scattering Studies on the Molecular Trajectory in Polyethylene Crystallized from Solution and MeltD. M. Sadler and A. KellerCite this: Macromolecules 1977, 10, 5, 1128–1140Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Publish…
The nature and extent of degradation incurred by glass surfaces impacted with spheres of steel and tungsten carbide were studied. The residual strength after impact depends on the velocity, radius, and density of the projectile; on the toughness and (indirectly) the hardness of the target; and, to a lesser degree, on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallinity, Supermolecular Structure, and Thermodynamic Properties of Linear Polyethylene FractionsJ. Maxfield and L. MandelkernCite this: Macromolecules 1977, 10, 5, 1141–1153Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of the gaseous metal carbonyl hydrides of manganese, iron, and cobaltE. A. McNeill and F. R. ScholerCite this: J. Am. Chem. Soc. 1977, 99, 19, 6243–6249Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfigurational Thermodynamics of the Liquid and Glassy Polymeric StatesRobert SimhaCite this: Macromolecules 1977, 10, 5, 1025–1030Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977https://pubs.acs.org/…
X-ray diffraction data for liquid benzene at 25°C are analyzed using scattering factors for C–H groups rather than for C and H atoms. This new approach permits the unique extraction of structure and correlation functions for carbon–carbon interactions from a single experiment. The data are used to find parameters for…
An examination of most of the known crystal structures of TCNQ salts is made in connexion with deter mining the amount of charge transfer. A method based on the bond lengths is shown to provide a sensitive test for determining this important quantity'. The charge distribution between different TCNQ molecules of the sa…
An enzyme system of Mycobacterium smegmatis catalyzing the elongation of medium-chain fatty acids with acetyl-CoA was obtained free from de novo fatty acid synthetase by ammonium sulfate fractionation. The system was resolved by gel filtration and DEAE-cellulose chromatography into three fractions, all of which were r…
The lattice parameter of NiO from 105 K to 813 K has been measured using the X-ray diffraction technique. An orthogonal polynomial of second-order with least square error approximation is fitted to the lattice parameter versus temperature data to obtain the thermal expansion coefficient, α. The high temperature values…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the free base porphyrin, protoporphyrin IX dimethyl esterWinslow S. Caughey and James A. IbersCite this: J. Am. Chem. Soc. 1977, 99, 20, 6639–6645Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Publis…
Formulas for the tensor permeability of partially magnetized ferrites are derived under some assumptions. The results obtained from this theory indicate that low-field losses are absent if\omega_{M}/\omega\leq\sqrt{5/3}. The theory is in good agreement with experimental results.
Abstract The < 1·0 µm fractions of three rhyolitic tephras are shown to contain multifaceted squat cylinders of halloysite at various stages of development. The < 1·0 µm fraction of one of the tephras, the Pahoia Tuff, is composed mainly of large well-ordered squat cylinders, together with amorphous silica flake…