Molecular and crystal structure of a high-temperature polymorph of chitosan from electron diffraction data
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Mortality Through 1990 Among White Male Workers at the Los Alamos National Laboratory
A cohort mortality study was conducted of 15,727 white men employed by the Los Alamos National Laboratory, a nuclear research and development facility. Some of the workers at this facility have been exposed to various forms of ionizing radiation and other potentially hazardous materials. These analyses focused on whol…
Strong Mn-Mn distance dependence of the Mn interlayer coupling inSmMn2Ge2-related compounds and its role in magnetic phase transitions
The interplay between the Mn interlayer coupling constant ${\mathit{n}}_{\mathrm{Mn}\mathrm{\ensuremath{-}}\mathrm{Mn}}$ and the thermal expansion has been investigated by means of thermal-expansion, specific-heat, and magnetization measurements. A linear relation between ${\mathit{n}}_{\mathrm{Mn}\mathrm{\ensuremath{…
Porous silicon superlattices
Porous silicon superlattices (PSSs) are a novel type of siliconbased heterostructures, in which the porosity varies periodically with depth. The two different types of PSSs and their techniques of formation are described, as are their optical properties and an example of an application: a Fabry‐Perot‐type interference…
P-T Phase Diagram and Gold Valence State of the Perovskite-Type Mixed-Valence Compounds Cs2Au2X6 (X = Cl, Br, and I) under High Pressures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTP-T Phase Diagram and Gold Valence State of the Perovskite-Type Mixed-Valence Compounds Cs2Au2X6 (X = Cl, Br, and I) under High PressuresN. Kojima, M. Hasegawa, H. Kitagawa, T. Kikegawa, and O. ShimomuraCite this: J. Am. Chem. Soc. 1994, 116, 25, 11368–11374Publication Date…
Compositional Dependence of Absorption Spectra of Ti 3+ in Silicate, Borate, and Phosphate Glasses
Absorption spectra of Ti 3+ were measured for silicate, borate, and phosphate glasses doped with 0.5 mol% Ti 2 O 3 .The absorption coefficient at the peak wavelength of the 2 T 2 → 2 E transition of Ti 3+ is used as a parameter showing the relative content of Ti 3+ ions in glass samples. The effect of glass compositio…
Ab Initio Calculation of the Magnetic Exchange Coupling in Linear Oxo-Bridged Binuclear Complexes of Titanium(III), Vanadium(III), and Chromium(III)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Calculation of the Magnetic Exchange Coupling in Linear Oxo-Bridged Binuclear Complexes of Titanium(III), Vanadium(III), and Chromium(III)K. Fink, R. Fink, and V. StaemmlerCite this: Inorg. Chem. 1994, 33, 26, 6219–6229Publication Date (Print):December 1, 1994Publi…
Using a two-dimensional detector for X-ray powder diffractometry
Special software has been developed to calculate the intensity–scattering-angle dependence. Powder diffraction patterns are obtained in a diffractometer with a two-dimensional area detector. The detector used is a planar proportional chamber with fast delay lines. The optimum sample geometry for both the transmission…
Nonionic Superbase-Promoted Synthesis of Oxazoles and Pyrroles: Facile Synthesis of Porphyrins and .alpha.-C-Acyl Amino Acid Esters
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonionic Superbase-Promoted Synthesis of Oxazoles and Pyrroles: Facile Synthesis of Porphyrins and .alpha.-C-Acyl Amino Acid EstersJiansheng Tang and John G. VerkadeCite this: J. Org. Chem. 1994, 59, 25, 7793–7802Publication Date (Print):December 1, 1994Publication History P…
Polyoxometalate-Diphosphate Complexes. 2. Structure of 18-Molybdopyrophosphate, [(P2O7)Mo18O54]4-, Which Encloses a Linear, Eclipsed Conformation of the Pyrophosphate Anion, and Preliminary Characterization of its One- and Two-Electron Heteropoly Blues
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate-Diphosphate Complexes. 2. Structure of 18-Molybdopyrophosphate, [(P2O7)Mo18O54]4-, Which Encloses a Linear, Eclipsed Conformation of the Pyrophosphate Anion, and Preliminary Characterization of its One- and Two-Electron Heteropoly BluesUli Kortz and Michael T…
Novel Nanoscopic Architectures. Linear-Globular ABA Copolymers with Polyether Dendrimers as A Blocks and Polystyrene as B Block
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Nanoscopic Architectures. Linear-Globular ABA Copolymers with Polyether Dendrimers as A Blocks and Polystyrene as B BlockIvan Gitsov and Jean M. J. FrechetCite this: Macromolecules 1994, 27, 25, 7309–7315Publication Date (Print):December 1, 1994Publication History Publ…
Syntheses, Crystal Structures, and Properties of New Layered Molybdenum(VI) Selenites: (NH4)2(MoO3)3SeO3 and Cs2(MoO3)3SeO3
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, Crystal Structures, and Properties of New Layered Molybdenum(VI) Selenites: (NH4)2(MoO3)3SeO3 and Cs2(MoO3)3SeO3William T. A. Harrison, Laurie L. Dussack, and Allan J. JacobsonCite this: Inorg. Chem. 1994, 33, 26, 6043–6049Publication Date (Print):December 1, 1994…
Acid Hydrolysis of Octahedral Mg 2+ Sites in 2:1 Layered Silicates: An Assessment of Edge Attack and Gallery Access Mechanisms
Abstract The acid hydrolysis products of trioctahedral fluorohectorite and phlogopite have been investigated by XRD, MAS NMR spectroscopy and nitrogen BET surface area analysis in an effort to assess the relative importance of edge attack and gallery access mechanisms. A dramatic loss of X-ray crystallinity and the fo…
Substituierte N,N‐Chelat‐Liganden ‐ Anwendungen in der Molybdän‐katalysierten Olefin‐Epoxidation
Abstract Substituted N,N‐Chelate Ligands ‐ Applications in Molybdenum‐Catalyzed Epoxidation of Olefins * Oxodiperoxomolybdenum complexes 4 of substituted 2‐[3(5)‐pyrazolyl]pyridines ( 2a‐g ) were synthesized in order to control the solubility of these complexes in organic solvents. Alkyl side chains (butyl, octyl, oct…
Design of antireflection gratings with approximate and rigorous methods
High-spatial-frequency gratings can be used as an alternative to thin-film antireflection coatings to reduce the reflectivity at the boundary between two different media. In the case of one-dimensional gratings, the conditions on the grating structure can be approximately determined by the effective medium theory (EMT…
Influence of vapor deposition parameters on SERS active Ag film morphology and optical properties
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of vapor deposition parameters on SERS active Ag film morphology and optical propertiesDavid J. Semin and Kathy L. RowlenCite this: Anal. Chem. 1994, 66, 23, 4324–4331Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published i…
Structural and Magnetic Effects of Successive Protonations of Oxo Bridges in High-Valent Manganese Dimers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Magnetic Effects of Successive Protonations of Oxo Bridges in High-Valent Manganese DimersMichael J. Baldwin, Timothy L. Stemmler, Pamela J. Riggs-Gelasco, Martin L. Kirk, James E. Penner-Hahn, and Vincent L. PecoraroCite this: J. Am. Chem. Soc. 1994, 116, 25,…
REPRODUCIBLE PREPARATION OF SILVER SOLS WITH UNIFORM PARTICLE SIZE FOR APPLICATION IN SURFACE‐ENHANCED RAMAN SPECTROSCOPY
Abstract This paper describes a new method for the preparation of silver colloids with a narrow range of particle size to be used in surface‐enhanced Raman spectroscopy. Using malachite green as a strongly adsorbing dye, it can be shown that colloids from different preparation batches exhibit the same enhancement fact…
A Solid-to-Solid Asymmetric Dihydroxylation Procedure for Kilogram-Scale Preparation of Enantiopure Hydrobenzoin
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Solid-to-Solid Asymmetric Dihydroxylation Procedure for Kilogram-Scale Preparation of Enantiopure HydrobenzoinZhi-Min Wang and K. Barry SharplessCite this: J. Org. Chem. 1994, 59, 26, 8302–8303Publication Date (Print):December 1, 1994Publication History Published online1 M…
Polyoxometalate Derivatives with Multiple Organic Groups. 1. Synthesis and Structures of Tris(organotin) .beta.-Keggin and .alpha.-Dawson Tungstophosphates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate Derivatives with Multiple Organic Groups. 1. Synthesis and Structures of Tris(organotin) .beta.-Keggin and .alpha.-Dawson TungstophosphatesFeibo Xin and Michael T. PopeCite this: Organometallics 1994, 13, 12, 4881–4886Publication Date (Print):December 1, 1994…