Materials Literature
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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…
An overview of the physics of glassy polymers and the relationships between molecular mechanisms and macroscopic physical, mechanical and transport properties of polymer glasses is presented. The importance of local translational and/or rotational motions of molecular segments in the glass is discussed in terms of the…
Adsorption of CO and NO individually and as a mixture of both on palladium catalysts has been investigated by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The effect of sodium ions has been considered by comparing Pd/SiO 2 catalyst, sodium-doped Pd/SiO 2, and Pd on natural…
1H and 15N NMR studies have been undertaken on complexes of Lactobacillus casei dihydrofolate reductase (DHFR) formed with analogues of the antibacterial drug brodimoprim (2,4-diamino-5-(3', 5'-dimethoxy-4'-bromobenzyl)pyrimidine) in order to monitor interactions between carboxylate groups on the ligands and basic res…
Amorphous WO 3 films, doped with phosphorus, have been synthesized by chemical vapor deposition of volatile, low-melting P-substituted tungsten carbonyls. The presence of a small quantity of dopant released by the precursor during its decomposition is sufficient to inhibit the crystallization of the tungsten oxide on…
Chitosan crystallization, performed by simple drying of an oligomer or polymer solution on a glass or mica surface, was studied at room temperature. Polarizing microscopy revealed the formation of two-dimensional spherulites that were shown to have a negative birefringence. After metal shadowing, electron microscopy i…
We investigated binary low-molecular-weight glass formers as model systems for mixtures of small and large molecules. Tricresyl phosphate (TCP) in oligomeric styrenes (OS), benzene in OS and polystyrene (PS), and benzene in TCP were studied by applying dielectric spectroscopy as well as 1 H, 2 H, and 31 P NMR spectros…
The reaction of mononuclear [LFe(III)] where L represents the trianionic ligand 1,4,7-tris(4-tert-butyl-2-mercaptobenzyl)-1,4,7-triazacyclononane with NiCl(2).6H(2)O and subsequent oxidations with [Ni(III)(tacn)(2)](ClO(4))(3) (tacn = 1,4,7-triazacyclononane) and PbO(2)/methanesulfonic acid produced an isostructural s…
An overview of the physics of glassy polymers and the relationships between molecular mechanisms and macroscopic physical, mechanical and transport properties of polymer glasses is presented. The importance of local translational and/or rotational motions of molecular segments in the glass is discussed in terms of the…