Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel carbonyl [Ni(CO)4] and iron carbonyl [Fe(CO)5]: molecular structures in the solid stateDario Braga, Fabrizia Grepioni, and A. Guy OrpenCite this: Organometallics 1993, 12, 4, 1481–1483Publication Date (Print):April 1, 1993Publication History Published online1 May 2002…
Reaction‐bonded Al 2 O 3 (RBAO) ceramics were fabricated starting from mechanically alloyed Al 2 O 3 /Al, Al 2 O 3 / Al/ZrO 2 , and Al 2 O 3 /Al/ZrO 2 /Zr mixtures. Isopressed compacts were heat‐treated in air up to 1550°C. Reaction‐bonding mechanisms, kinetics, and the influence of ZrO 2 and Zr additions are investig…
We recently found, using cultured mouse cell systems, that newly synthesized catalytic (C) subunits of cyclic AMP-dependent protein kinase undergo a posttranslational modification that reduces their electrophoretic mobilities in sodium dodecyl sulfate (SDS)-polyacrylamide gels and activates them for binding to a Sepha…
An unusual two-dimensional mesh of CuII ions is found in complex 1(see picture); the metal atoms are bridged by oxalato (ox) and bipyrimidine (bpym) ligands to form ringshaped hexamers. Variable-temperature magnetic susceptibility measurements indicate that antiferromagnetic coupling between the Cu atoms occurs.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAre the equilibrium concentrations of carbon monoxide and hydrogen exceeded during the oxidation of methane over a nickel/ytterbium oxide catalyst?Dhammike Dissanayake, Michael P. Rosynek, and Jack H. LunsfordCite this: J. Phys. Chem. 1993, 97, 15, 3644–3646Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental/theoretical studies of the paramagnetic 52/53-electron triangular metal [Ni3(.eta.5-C5H5)3(.mu.3-S)2]n series (n = 1+, 0) containing weak metal-metal bonding interactions: Fenske-Hall MO analysis of the trimetal-antibonding frontier orbitals involved in the reve…
The ligand sarcophagine ( sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6] icosane ) rapidly reacts with [ Mn (OH2)6]2+ to form the nearly colourless [ Mn ( sar )]2+ ion, which can readily be oxidized to the bright orange [Mn ( sar )]3+ ion (E°'+0.53 V v. n.h.e. in 0.1 mol l-1 CF3SO3H at 295 K). A single-crystal structure…
Contrary to the traditional view, unnotched direct tension test specimens of quasi‐brittle materials that exhibit post‐peak strain softening do not deform symmetrically. After passing the peak load, the equilibrium path bifurcates and the secondary postbifurcation branch represents flexing to the side. The bifurcation…
Indentation crack initiation and propagation in tempered glass surfaces are examined and the results compared to those in annealed and in ion‐exchange‐strengthened glasses. The presence of surface compression due to tempering inhibits median crack initiation during the loading cycle of the indentation and depresses th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe layered ternary germanium tellurides ZrGeTe4, HfGeTe4, and TiGeTe6: structure, bonding, and physical propertiesArthur Mar and James A. IbersCite this: J. Am. Chem. Soc. 1993, 115, 8, 3227–3238Publication Date (Print):April 1, 1993Publication History Published online1 May…
This work treats many-body aspects in an idealized class of reversible binding problems involving a static binding site with many diffusing point particles. In the noncompetitive limit, where no restriction exists on the number of simultaneously bound particles, the problem reduces to reversible aggregation. In the co…
It is known from crystallographic investigations that there are two distinct Pt–S modifications, PtS and PtS2 [see R. Collins, R. Kaner, P. Russo, A. Wold, and D. Avignant, Inorg. Chem. 18, 727 (1979); A. Finley, D. Schleich, J. Ackerman, S. Soled, and A. Wold, Mater. Res. Bull. 9, 1655 (1974); S. Soled, A. Wold, and…
X-ray photoemission measurements of high purity CuCl are presented. XPS studies of Cu compounds have been motivated in this laboratory by the need to identify species on high temperature superconductor surfaces which have been chemically etched [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (…
A derivation of the relaxation strength for anelastic and dielectric relaxation of point defects is proposed, and the calculation is extended to cases not yet treated; the formulas reported in the literature can be obtained as particular cases. The relaxation strength is expressed as the sum of the contributions of al…
X-ray photoemission measurements of high purity CuI are presented. XPS studies of Cu compounds in this laboratory have been motivated by the need to identify species on chemically etched high temperature superconductor surfaces [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (1989)].
A series of fluorinated polyinides and fluorinated polyimides containing heterocyclic moieties were prepared and investigated to determine their dielectric constants, dielectric constants as a function of relative humidity (RH) and thermal properties. Thle fluorinated polyimides containing heterocyclic moieties were p…
Abstract The Rietveld method requires a two-part starting model (see Chapter 1 and elsewhere), a structural model based on approximate atomic positions and a non-structural model which takes into account the contributions of individual line profiles in terms of analytical or other differentiable functions. Both must b…
Abstract Since the initial studies of chlorite polytypes, it has been suggested that the stability of the various polytypes may be a function of the temperature at which the mineral formed; however, few studies have been performed in which polytypes of chlorite in a specific suite of samples have been determined and c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of an optically active helical bis-cobaltocenium ionAdam M. Gilbert, Thomas J. Katz, William E. Geiger, Matthew P. Robben, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1993, 115, 8, 3199–3211Publication Date (Print):April 1, 1993Publication Hi…
The hpaB gene encoding an aromatic hydroxylase of Escherichia coli ATCC 11105, a penicillin G acylase-producing strain, has been cloned and expressed in E. coli K-12. This gene was located near the pacA gene coding for penicillin G acylase. The hydroxylase has a molecular mass of 59,000 Da, uses NADH as a cosubstrate,…