Materials Literature
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Extensive optimization on the fabrication of Mo/Si multilayer systems is carried out at the FOM Institute Rijnhuizen using e-beam evaporation. The process is being optimized including parameters such as variation of the mirror's center wavelength, the metal fraction, deposition parameters, and the layer composition. R…
The EPR of NO. can be detected in the liquid and solid states when crystal fields are sufficient to remove the axial symmetry and separate the (pi*)x and (pi*)y orbitals by a few hundred reciprocal centimeters. The theory of the EPR spin Hamiltonian of bound NO. is reviewed, further developed, and then applied to the…
The electronic absorption and magnetic circular dichroism spectral data of a phthalocyanine dicopper complex that is deduced to be very planar and to share a common benzene ring have been studied by band deconvolution analysis. The results were compared with those of the molecular orbital (MO) calculations within the…
We develop a coarse-grained model to investigate the influence of nanoscale particles on the phase separation and the morphology of symmetric AB diblock copolymer films. The microphase separation is modeled by the cell dynamical systems (CDS) equations, while the particle dynamics is described by the Langevin equation…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEfficient Synthesis of Well-Defined, High Molecular Weight, and Processible Polyanilines under Mild Conditions via Palladium-Catalyzed AminationXiao-Xiang Zhang, Joseph P. Sadighi, Thomas W. Mackewitz, and Stephen L. BuchwaldView Author Information Department of Chemis…
An easy synthesis of core-modified meso-aryl smaragdyrins containing oxygen and sulfur in addition to pyrrole nitrogens has been achieved through an alpha-alpha coupling involving modified tripyrrane and dipyrromethane. The complexation behavior of these macrocycles toward anions (Cl-, F-, AMP-) and metal cations (Rh(…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPeroxidase Activity in Heme Proteins Derived from a Designed Combinatorial LibraryDavid A. Moffet, Laura K. Certain, Allison J. Smith, Adam J. Kessel, Katharine A. Beckwith, and Michael H. HechtView Author Information Department of Chemistry, Princeton University Princ…
We report defect-resonance patterns associated with two kinds of low-concentration defects typically found in metallocene-synthesized isotactic polypropylenes (iPP's). These defects are the simple mrrm stereo defect and the regio 2,1-erythro defect. This work is a critical part of our effort to determine the extent to…
A cobalt porphyrin equipped with two different but geometrically complementary pyridine ligands self-assembles to form an unusually stable complex with approximately 12 porphyrin monomers arranged in a macrocyclic array.
The aerobic reaction of Cr(CO)6 with tris(pentafluorophenyl)corrole (H3(TpFPC)) in toluene gives the dark red oxochromium(V) compound (TpFPC)Cr(O), which has been characterized by X-ray crystallography, electrochemistry, and EPR spectroscopy. Short Cr-N (1.927-1.943 A) bonds as well as relatively large 14N and small 5…
We have performed a molecular dynamics simulation study of atactic polystyrene (a-PS) and its dimer 2,4-diphenylpentane (DPP) using a previously derived quantum chemistry based explicit atom force field. The X-ray structure factor of a-PS obtained from simulations was found to be in good agreement with experiment, rep…
A family of diphenylethyne-linked porphyrin dimers and trimers has been prepared via a building block approach for studies of energy-transfer processes. The dimers contain Mg and Zn porphyrins (MgZnU); the trimers contain an additional free base porphyrin (MgZnFbU). In both the dimers and trimers, sites of attachment…
A bulk polycrystalline sample of YBa_{2}Cu_{3}O_{7-δ} (δ\approx 0.1) has been irradiated by γ-rays with ^{60}Co source. Non-monotonic behavior of T_c (defined as the temperature at which normal resistance is halved) with increasing irradiation dose Φ(up to about 220 MR) is observed: T_c decreases at low doses (Φ\leq 5…
We present analytic approximations for the field, temperature, and orientation dependences of the interface velocity in a two-dimensional kinetic Ising model in a nonzero field. The model, which has nonconserved order parameter, is useful for ferromagnets, ferroelectrics, and other systems undergoing order-disorder ph…
The self-aggregation of cationic porphyrins in aqueous solution has been studied by means of absorption, 1 H NMR, and resonance light scattering spectroscopy. The aim of the present study is clarification of the factors which most influence porphyrin self-aggregation in water. Cationic 5,10,15,20-tetrasubstituted porp…
Standard electrochemical data for high-quality, boron-doped diamond thin-film electrodes are presented. Films from two different sources were compared (NRL and USU) and both were highly conductive, hydrogen-terminated, and polycrystalline. The films are acid washed and hydrogen plasma treated prior to use to remove no…
Two years after the first light of UT1 a summary of the On- site optical maintenance situation seems necessary. A comparison with the Maintenance Program developed in Europe will be commented. Measured data on the large mirrors and the efforts to maintain and improve the on-site contamination at a low level will be pr…
The structural, kinetic and photophysical properties of bimetallic lanthanide complexes with simple calix[n]arenes (n = 5 and 8) are discussed. The intensity of the f-f transitions of the Eu(III)-containing edifices strongly depends on the mixing between 4f and ligand-to-metal charge-transfer (LMCT) wave functions. In…
Poly(ethylene glycol) (PEG) has long been recognized for its unusual ability to resist protein adsorption. This is attributed to the repulsion of proteins by the polymer segments. Despite its successes, there are several reports that PEG does weakly bind proteins. This work tests the hypothesis that the PEG can bind t…
Transport behavior of trivalent solutes across mesoporous Anopore γ-alumina membranes was investigated as a function of pore diameter, pH, ionic strength, and nature of the salt in solution. Radiotracers, 55 Fe, 152 Eu, 157 Tb, and 241 Am, were present in the feed solutions at concentrations ranging from 10 - 8 to 10…