Block copolymer adsorption in a selective solvent: a kinetic study
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Optical and magnetic properties of the halogen-bridged metal complexes modified by hydrogen bondings: {M(1R,2R-cyclohexanediamine)2Br}Br2(M=Pt, Pd, and Ni)
Polarized reflection and ESR measurements have been carried out on single crystals of newly synthesized halogen-bridged one-dimensional (1D) metal complexes {M(chxn${)}_{2}$Br}${\mathrm{Br}}_{2}$ (M=Pt, Pd, Ni; chxn=1R,2R-cyclohexanediamine), which have tight hydrogen bonds between ligands (chxn) and counter anions ($…
Amine‐Template‐Directed Synthesis of Cyclic Porphyrin Oligomers
The dimers 1 can be prepared in 70% yield by Glaser coupling, if the reaction is carried out in the presence of 4,4′-bipyridine as template. With a tripyridyltriazine as template, formation of the corresponding trimer (52%) is favored. Without template the reaction is unselective: Dimer and trimer are formed together…
Multipole corrections to the angular distribution of photoelectrons at low energies
Higher multipole corrections to the dipole-approximation result for angular distributions of photoelectrons at low photon energies are discussed. The first-order corrections lead to a simplified formula for the angular distribution, which extends the dipole results for linearly, unpolarized, and partially polarized li…
A tetranuclear hydroxo-bridged copper(II) cluster of the cubane type. Preparation and structural and magnetic characterization of tetrakis[(2,2'-bipyridyl)hydroxocopper(II)] hexafluorophosphate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA tetranuclear hydroxo-bridged copper(II) cluster of the cubane type. Preparation and structural and magnetic characterization of tetrakis[(2,2'-bipyridyl)hydroxocopper(II)] hexafluorophosphateJorunn Sletten, Astrid Soerensen, Miguel Julve, and Yves JournauxCite this: Inorg.…
PLANAR PATTERNS WITH FIVEFOLD SYMMETRY AS SECTIONS OF PERIODIC STRUCTURES IN 4-SPACE
Two quasiperiodic planar patterns with fivefold symmetry are derived from the root lattice A 4 in 4-space. A detailed analysis of the geometry of the A 4 Voronoi complex and its dual complex is presented with special emphasis on fivefold symmetry. By means of the general dualization method, 2D patterns are obtained, o…
Observation of strain-induced β form in poly(β-hydroxyalkanoates)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of strain-induced β form in poly(β-hydroxyalkanoates)W. J. Orts, R. H. Marchessault, T. L. Bluhm, and G. K. HamerCite this: Macromolecules 1990, 23, 26, 5368–5370Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inis…
Intrinsic electron and hole defects in stabilized zirconia single crystals
Intrinsic defects have been produced in yttria- and calcia-stabilized zirconia (YSZ or CaSZ) single crystals either by x irradiation at 300 and 77 K or by thermochemical reduction at 1370, 1670, and 1870 K. The spectroscopic properties of the defects have been studied by electron paramagnetic resonance (EPR), optical…
Electrical and Magnetic Properties and X‐Ray Structure of a Highly Conductive 4:1 Complex of Tetracyanoquinodimethane and a Tetrathiafulvalene Derivative
Despite strong twisting of the conjugated system, the tetrathiafulvalene homologue 1 reacts with the electron acceptor tetracyanoquinonodimethane to give the dication 12⊕. The anthracene moiety is embedded in the 12⊕ [(TCNQ)4]2⊖, and the dithiol rings are twisted 86° with respect to the anthracene plane: The 1:4 stoic…
Domain boundaries in convection patterns
Domain boundaries (DB's) in convection patterns are studied near the onset of convection within the framework of amplitude equations of the Newell-Whitehead-Segel type. It is demonstrated that DB's of an arbitrary direction are possible between domains occupied by convection rolls with different orientations. Those DB…
Nuclear Shapes in Mean Field Theory
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
New route to unsymmetrical phthalocyanine analogs by the use of structurally distorted subphthalocyanines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew route to unsymmetrical phthalocyanine analogs by the use of structurally distorted subphthalocyaninesNagao Kobayashi, Ryoko Kondo, Shinichiro Nakajima, and Tetsuo OsaCite this: J. Am. Chem. Soc. 1990, 112, 26, 9640–9641Publication Date (Print):December 1, 1990Publication…
NMR and crystallographic studies of a p-sulfonatocalix[4]arene-guest complex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR and crystallographic studies of a p-sulfonatocalix[4]arene-guest complexSeiji Shinkai, Koji Araki, Tsutomu Matsuda, Nobuaki Nishiyama, Hirotaka Ikeda, Isao Takasu, and Masakazu IwamotoCite this: J. Am. Chem. Soc. 1990, 112, 25, 9053–9058Publication Date (Print):December…
Editorial
DRX study of the effects of aluminates and ferrites additions over bicalcium silicates formations
It must be measured the height that is obtained in the peaks indicated in the diffractograms of the compounds: CaO, SÍO2, β-C2S γ-C2S, C3A, C2F and C4AF, with the finality of study their mutual influences, and also study the aluminoferrites over such bicalcic silicates, obtained from differents raw mix. The adquired k…
Macroscopical morphology of deterioration of the stone in the Cathedral of Cádiz, Spain
Two factors have determined the actual deterioration state of the Cathedral of Cádiz, one is natural and the other is anthropogenic. On one hand, the presence of salts conditioned by atmospherical environment and saline solutions of the rising damp; on the other hand, the vicissitudes suffered by the temple during its…
Comportamiento hídrico de pizarras de techar
The hidric behaviour of two slaty rocks from the NW of Spain (phyllite of Rande —La Coruña— and slate of Luarca —Asturias—) used as ornamental and roof slate is studied. An experimental methodology for proper interpretation of the hidric phenomena to which they can be subjected due to their particular use in the build…
Concrete blocks. Analysis of UNE, ISO en standards and comparison with other international standards
This paper attempts to describe the recently approved UNE standards through a systematic analysis of the main specifications therein contained and the values considered for each of them, as well as the drafts for ISO and EN concrete block standards. Furthermore, the study tries to place the set of ISO standards in the…
Noticias
The flow of powders and of liquids of high viscosity
It is argued that powders have so many particles per unit volume that they can be treated in a manner similar to conventional liquids. They have an entropy S(V,N), but as energy is not important the place of temperature delta E/ delta S is taken by delta V/ delta S. Equations capable of giving plug flow are derived. I…