Materials Literature
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Paramagnetic complexes of manganese(II), iron(III), and gadolinium(III) with many ligands appear to undergo ligand substitution in vivo, producing biodistribution data similar to the hydrated metal ions. To identify ligands likely to be valuable in the preparation of paramagnetic contrast agents, a series of aminopoly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-mediated trans-cis isomerization of substituted tetrathiafulvalenes. Selective precipitation of the trans isomerAbdelaziz Souizi, Albert Robert, Patrick Batail, and Lahcene OuahabCite this: J. Org. Chem. 1987, 52, 8, 1610–1611Publication Date (Print):April 1, 1987Public…
Abstract Self aggregation of 4,4′,4″,4'″-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis[1-methylpyridinium] cation (TMPyP4+) in water has been verified by means of fluorescence and 1H NMR spectroscopy. The novel fluorescence behavior of TMPyP such as extraordinarily red-shifted Q(0-0) fluorescence band, blue shift of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of carboxylate complexes. VII. Partial valence trapping in a trinuclear mixed-valence iron(III,III,II) cluster: vibrational spectra of [Fe3O(OOCCH3)6L3] and related mixed-metal complexesL. Meesuk, U. A. Jayasooriya, and R. D. CannonCite this: J. Am. Chem.…
Cytochrome c oxidase contains four redox-active metal centers: two heme irons, cytochromes a and a3, and two copper ions, CuA and CuB. Due to the paucity of spectroscopic signatures for both copper sites in cytochrome c oxidase, the ligands and structures for these sites have remained ambiguous. The specific depletion…
In den letzten fünfzehn Jahren wuchs die Einsicht in die Notwendigkeit eines effizienten Umweltschutzes. Konkrete Maßnahmen setzen allerdings eine umfassende Analyse der gegebenen Umweltsituation und die Abschätzung sowohl der positiven Auswirkungen als auch der Risiken einer geplanten Veränderung voraus. Dies ist nur…
An electron spectrometer is described for use in threshold photoionisation studies. The spectrometer incorporates a penetrating field extractor stage, a 127 degrees cylindrical deflection analyser and an electrostatic lens system to match the two together. The high collection efficiency, resolution, transmission and s…
Unidirectional L-phenylalanine transport into six brain regions of pentobarbital-anesthetized rats was studied using the in situ brain perfusion technique. This technique allows both accurate measurements of cerebrovascular amino acid transport and complete control of perfusate amino acid composition. L-Phenylalanine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopic, and structural studies of extremely short chain basket handle porphyrins and their zinc(II) complexesUrsula Simonis, F. Ann Walker, Patricia Lani Lee, Bernard J. Hanquet, Dieter J. Meyerhoff, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1987, 1…
The map of the intermolecular overlap integrals(S) of the lowest unoccupied molecular orbital(LUMO) of Ni(dmit) 2 was calculated by varying the intermolecular configuration parameters in order to examine the dimensionality of the electronic band structure of the molecular conductors based on Ni(dmit) 2 . Despite the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of tautomerism in 2-substituted 5,10,15,20-tetraphenylporphyrins: directionality of proton transfer between the inner nitrogensMaxwell J. Crossley, Leslie D. Field, Margaret M. Harding, and Sever SternhellCite this: J. Am. Chem. Soc. 1987, 109, 8, 2335–2341Publicati…
Abstract not Available.
Three grades of polyethylene differing mainly in their molecular weight were irradiation and peroxide crosslinked. Their gel content, degree of swelling, melting temperature, degree of crystallinity, and tensile properties were determined. The irradiation and peroxide crosslinking of the same polymers makes it possibl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of orthosilicic acid, silanol, and H3SiOH.cntdot.AlH3 complex: models of surface hydroxyls in silica and zeolitesJoachim. SauerCite this: J. Phys. Chem. 1987, 91, 9, 2315–2319Publication Date (Print):April 1, 1987Publication History Published online1 May…
Abstract Geveral new polyimides were prepared from the reaction of four aromatic dianhydrides with four new diamines containing carbonyl and ether connecting groups between the aromatic rings. The diamines were prepared from the reaction of 4‐aminophenol with activated aromatic difluoro compounds in the presence of po…
[111]-oriented PZT films have been successfully grown with good epitaxy onto epitaxial platinum film substrates by the rf-magnetron sputtering method using Pb enriched PZT(90/10) targets. The sputtering conditions for growing epitaxial films were investigated. Crystallographic identifications of the films were made by…
Abstract Pillaring of montmorillonite and beidellite with aluminum polyhydroxypolymer takes place first by the saturation of the cation-exchange capacity by monomeric and/or dimeric aluminum hydroxide species and then the intercalation of the so-called Al 13 -polyhydroxypolymer. The clay slurry must have a solid conce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically controlled release of hexacyanoferrate(4-) from polypyrroleLarry L. Miller, Baruch Zinger, and Qin Xin ZhouCite this: J. Am. Chem. Soc. 1987, 109, 8, 2267–2272Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…
Abstract Reaction of 2,6-diacetylpyridine with 1,3-diamino-2-propanol in the presence of lanthanoid(III) ions gave complexes of (2+2) macrocyclic tetraimine ligand, H2apdapy. Complexes synthesized have the composition of Ln2(apdapy)(NO3)4(H2O)5 (Ln=La or Pr) or Ln2(apdapy) (NCS)4 (H2O)4 (Ln=La, Pr, Nd, Sm, or Eu). It…
Deformation properties of forsterite have been deduced simultaneously from X-ray diffraction data affected by extinction in Bonn-Pittsburgh (B), and in Groningen (G). For the G crystals, GI and GII, extinction is anisotropic and considerably larger than for crystal B. Measurements were made with Mo radiation for B, an…