Materials Literature
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The photophysical properties of a multicomponent array consisting of a free-base aryl-porphyrin and a gold(III) aryl-porphyrin, assembled via a central bis(terpyridine) ruthenium(II) complex, PH 2 −Ru−PAu, have been studied in low-temperature glassy media by steady state and time-resolved methods. Comparison of the ph…
A finite element implementation is reported of the Fleck–Hutchinson phenomenological strain gradient theory. This theory fits within the Toupin–Mindlin framework and deals with first-order strain gradients and the associated work-conjugate higher-order stresses. In conventional displacement-based approaches, the inter…
The exact physical and chemical nature of 55 million gallons of radioactive toxic waste held in 177 underground waste tanks at the Hanford Site is not known with sufficient detail to support the safety, retrieval, and immobilization missions presented to Hanford. The purpose of this study is to estimate probability di…
Experimental solubilities are reported for anthracene dissolved in ternary 2-butoxyethanol + cyclohexane + 1-propanol, 2-butoxyethanol + cyclohexane + 2-propanol, 2-butoxyethanol + heptane + 1-propanol, and 2-butoxyethanol + heptane + 2-propanol solvent mixtures at 298.15 K. Nineteen compositions were studied for each…
Reactions with semiconductor surfaces are important for many processes such as epitaxial growth, dopant incorporation, and patterning that underlie semiconductor technology. Recent advances in scanning tunneling microscopy techniques have enabled substantial progress in identifying the underlying processes. The studie…
The phase separation of a thin polymer blend layer undergoing a simultaneous transesterification reaction is examined by a variety of experimental techniques [neutron and X-ray reflectivity, optical microscopy, atomic force microscopy (AFM)] to determine morphological features unique to reactive phase separation. Neut…
Results of investigations of the gas-phase reactions of nickel and nickel oxide ions with NO 2 are reported in this final part of a four-part series. A fast flow reactor−quadrupole mass spectrometer system coupled with a laser vaporization source is used to study reactions of nickel and nickel oxide cluster ions with…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAn Electrosynthetic Path toward PentaporphyrinsLaurent Ruhlmann, Sylvie Lobstein, Maurice Gross, and Alain GiraudeauView Author Information Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, U.M.R. No. 7512, CNRS, Université Louis Pasteur, 4 rue Blaise Pascal, F…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOxo-Like Reactivity of High Oxidation State Osmium Hydrazido ComplexesMy Hang V. Huynh, El-Sayed El-Samanody, Konstantinos D. Demadis, Thomas J. Meyer, and Peter S. WhiteView Author Information Venable and Kenan Laboratories Department of Chemistry The University of No…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinding of Organic Nitroso Compounds to MetalloporphyrinsGeorge B. Richter-AddoView Author Information Department of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, Oklahoma 73019 Cite this: Acc. Chem. Res. 1999, 32, 6, 529–536Publication Dat…
A new solvothermal pressure-relief (SPR) process was successfully developed for synthesis of La2O2S at relatively low temperature (300 °C) by using La(NO3)3·nH2O and NH2CSNH2 as reactants in organic media. In contrast, the normal solvothermal and hydrothermal process can only produce La(OH)CO3 and La(OH)SO4, respectiv…
Phe161 and Arg166 of p-hydroxybenzoate hydroxylase from Pseudomonas fluorescens belong to a newly discovered sequence motif in flavoprotein hydroxylases with a putative dual function in FAD and NADPH binding [1]. To study their role in more detail, Phe161 and Arg166 were selectively changed by site-directed mutagenesi…
This paper is based on the recent discovery that the thermal decomposition of poly(methylsilsesquicarbodiimide), [CH 3 Si(N C N) 1.5 ] n, leads to amorphous silicon carbonitride (SiCN) ceramics. In the present study the polymer-to-ceramic transformation is characterized using analytical and spectroscopic methods. In p…
The accumulation and toxicity of the weak base doxorubicin has been investigated as a function of extracellular pH, intracellular pH and the cellular pH gradient in cells previously cultured under normal (pH 7.4) and low-pH (6.8) conditions. Low-pH-adapted cells exhibit transmembrane pH gradients which substantially d…
The atomic motions in crystals are correlated. In this paper we demonstrate that information about the correlated motion of atoms, and consequently about the bonding within the crystal, can be obtained by analyzing the peak width of the atomic pair distribution function (PDF). We have measured the PDFs of Ni and InAs…
The increase in proportion of the non-biological (D-) isomer of aspartic acid (Asp) relative to the L-isomer has been widely used in archaeology and geochemistry as a tool for dating. the method has proved controversial, particularly when used for bones. The non-linear kinetics of Asp racemization have prompted a numb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthetic and Structural Chemistry of Heme Derivatives with Nitric Oxide LigandsW. Robert Scheidt and Mary K. EllisonView Author Information The Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556 Cite this: Acc. Chem. Res. 1999,…
The design of predictable multichromophoric supramolecular arrays of freebase and metallo porphyrins constitutes an essential first step toward the synthesis of light-harvesting complexes. We now report crystal engineering strategies to achieve the synthesis of controllable and predictable porphyrinic multichromophore…
For mercury-free fluorescent lamps and plasma display panels, alternative luminescent materials are required for the efficient conversion of vacuum ultraviolet radiation to visible light. Quantum cutting involving the emission of two visible photons for each vacuum ultraviolet photon absorbed is demonstrated in Eu3+-d…
Cellulose samples were found to be soluble in PF/DMSO to form a genuine dilute solution without suffering obvious degradation under adequate conditions. The Mark-Houwink-Sakurada equation for cellulose in PF/DMSO at 30°C obtained here was [η] = 3.01 × DP0.81 where [η] is in the unit of cm3·g−1. The intrinsic viscosity…