Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unusually stable manganese(II)manganese(III) complex with novel EPR spectra: synthesis, structure, magnetism, and EPR analysisHsiu Rong. Chang, Habibe. Diril, Mark J. Nilges, Xiaohua. Zhang, Joseph A. Potenza, Harvey J. Schugar, David N. Hendrickson, and Stephan S. IsiedC…
The purpose of the paper is to give the theoretical basis for the design and optimization of X-UV interference mirrors. To achieve this original results are presented and the « state of the art » methods are reviewed. A new formulation of the Bragg conditions is obtained on the basis of the « Hill method » to solve th…
This study investigated the effect of protective clothing ensembles (against chemical agent and cold weather) on the energy cost of a bench stepping task (20 steps/min on a 0·305 m high bench). Twelve male soldiers (mean age 25·5 years; mean weight 75·4 kg) performed the task at an ambient temperature of 10°C in each…
The first observation of a new director orientation within nematic droplets is reported. This orientation consists of the nematic director field arranged concentrically around a central core running through the center of the droplet, with tangential alignment of the nematic at the droplet surface. It is shown that for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtremely weak magnetic exchange interactions in terpy-containing copper(II) dimer. Crystal and molecular structure of Cu(terpy)(CA).H2O and [Cu2(terpy)2(CA)](PF6)2 complexes (terpy = 2,2':6',2"-terpyridine, CA = dianion of chloranilic acid)Jose V. Folgado, Rafael Ibanez, Eu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal asymmetric transformations at interfaces with centrosymmetric crystals: role of hydrophobic and kinetic effects in the crystallization of the system glycine/.alpha.-amino acidsI. Weissbuch, L. Addadi, L. Leiserowitz, and M. LahavCite this: J. Am. Chem. Soc. 1988, 110,…
U.v. photolysis of homogeneous solutions containing tetrakis(tetrabutylammonium)decatungstate(VI), [NBu4]4[W10O32], and olefins in acetonitrile leads to dimerization of olefins via abstraction of an allyl hydrogen, with accompanying formation of reduced decatungstates, up to two electrons. Coexistence of heterogeneous…
The core structure of hedgehog point disclinations in magnetic and nematic liquid crystal systems is investigated within Landau theory. Exact spherically symmetric solutions are found, with isotropic cores. In the nematic hedgehog the solution is uniaxial everywhere. Nematic hedgehogs are very much larger than magneti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContrasting one- and two-cation binding behavior in syn- and anti-anthraquinone bibracchial podand (BiP) mono- and dianions assessed by cyclic voltammetry and electron paramagnetic resonance spectroscopyMilagros. Delgado, Deborah A. Gustowski, Hyunsook K. Yoo, Vincent J. Gat…
In Escherichia coli, a single operon encodes the metabolic and regulatory enzymes of the glyoxylate bypass. The metabolic enzymes, isocitrate lyase and malate synthase, are expressed from aceA and aceB, and the regulatory enzyme, isocitrate dehydrogenase kinase/phosphatase, is expressed from aceK. We cloned this opero…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercalation of cationic, anionic, and molecular species by organic hosts. Preparation and crystal structure of [NH4]6[calix[4]arenesulfonate][MeOSO3].cntdot.(H2O)2Simon G. Bott, Anthony W. Coleman, and Jerry L. AtwoodCite this: J. Am. Chem. Soc. 1988, 110, 2, 610–611Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinitiated charge separation in a carotenoid-porphyrin-diquinone tetrad: enhanced quantum yields via multistep electron transfersDevens. Gust, Thomas A. Moore, Ana L. Moore, Donna. Barrett, Larry O. Harding, Lewis R. Makings, Paul A. Liddell, F. C. De Schryver, M. Van de…
Abstract Polysiloxanes with oligo‐oxyethylene side chains of the type —O(CH 2 CH 2 O) 7 CH 3 and —(CH 2 ) 3 O(CH 2 CH 2 O) n CH 3 (average n ≈ 7 and 11) were synthesized from poly(hydrogenmethylsiloxane) and characterized by 1 H n.m.r., 29 Si n.m.r., i.r. and g.p.c. Cyclic analogues were used as model compounds and sy…
The mechanical properties of ceramic brackets, particularly fracture toughness, are so different from those of metal brackets that their selection and handling requires a completely different set of criteria and techniques.
Abstract Addition type imide resins are finding increased use as matrix resins for advanced composites. Many different chemical approaches have been used to synthesize imide resins which are easy to process (similar to epoxies) but higher in temperature resistance. This paper outlines recent advances in thermosetting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymer blends. 2. TheoryPaul C. Painter, Yung Park, and Michael M. ColemanCite this: Macromolecules 1988, 21, 1, 66–72Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of hydrophobically associating block polymersP. L. Valint Jr. and J. BockCite this: Macromolecules 1988, 21, 1, 175–179Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrregular spin state structure in trinuclear species: magnetic and EPR properties of manganese(II)-copper(II)-manganese(II) and nickel(II)-copper(II)-nickel(II) compoundsYu Pei, Yves Journaux, and Olivier KahnCite this: Inorg. Chem. 1988, 27, 2, 399–404Publication Date (Prin…
The relaxation processes responsible for the finite lifetime of excited vibrational states in molecular crystals are discussed on the basis of recent experimental and theoretical developments. Experimental information on the lifetime of optically active phonons is obtained in the time domain by time-resolved CARS spec…
The subject of the viscous and viscoelastic behavior of ionomer systems is addressed from a general point of view. Following some introductory material concerning terminology and characteristics of ionomers that are pertinent for later discussion, the format will be to first briefly consider the glassy state followed…