Materials Literature
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Abstract Dipolar splittings with a quadratic dependence on static magnetic field strength are reported for selected pairs of nuclei in several porphyrins. These splittings are detectable as a result of a slight molecular alignment caused by the interaction of the static magnetic field with the anisotropic magnetic sus…
Transmission electron energy loss spectra were obtained from small (approximately 100-Å diam) regions of a series of single-phase silicon-containing specimens at 100-keV incident beam energy, using a field emission source transmission electron microscope fitted with a magnetic sector spectrometer. The specimen foils w…
Optical techniques have been used to study the extended persistence of luminescence in willemite phosphors coactivated with Mn and As. Absorption and photoluminescence excitation spectroscopy establish that the impurity ground state lies below the conduction bandedge in willemite. Laser pulse excitation at energies >…
Simultaneous electrochemical and ellipsometric investigations of the behavior of iron in 0.05 NaOH solution ( p H 12) with and without the addition of EDTA showed that EDTA did not affect the passive film formation but drastically enhanced cathodic reduction of the passive film. Cathodic reduction of the passive film…
Abstract When vic ‐dihydroxychlorins undergo a pinacol‐pinacolone rearrangement, the migratory aptitudes of common porphyrin substituents follow the order: alkyl groups, propionate side chain, H > methyl group > acetate side chain. C ‐Alkylchlorins can be made by extremely short syntheses utilizing such rearrang…
Abstract Carbon 1 s (C1s) core‐level positions have been calculated for two model compounds which are similar in structure to the PMDA part of the PMDA‐ODA monomer of polyimide. It is found that either one or two N ‐phenyl imide groups fused to a benzene ring will lower the C1 s energy levels of the benzene ring. The…
Radiation grafting of monomers onto suitable trunk polymers is a useful tool for tailoring new polymers for special purposes. This technique has been used in the past for the development of biocompatible materials, e.g., by grafting hydrogels onto mechanically stable polymers. In this first part of our work, the radia…
Abstract Growth of potassium alum crystals was characterized by the advance rates of crystals on the leading edge of population distributions and by the advance rates of the modes of these distributions. Growth rates of crystals on the leading edge appeared to follow size‐dependent kinetics, but the observed spread of…
Ein isoliertes Anthracen-Radikalanion liegt im kristallinen μ-Trichloro-dimagnesium·6thf(1+)-anthracenid 2 vor. 2 kann aus Mg, Anthracen und MgCl2 oder as dem Mg-Komplex 1, Anthracen und MgCl2, jeweils in Tetrahydrofuran (THF), erhalten werden.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR spectra of low-symmetry tetrahedral high-spin cobalt(II) in a cinchoninium tetrachlorocobaltate(II) dihydrate single crystalH. Drulis, K. Dyrek, K. P. Hoffmann, Stanislaw K. Hoffmann, and A. Weselucha-BirczynskaCite this: Inorg. Chem. 1985, 24, 24, 4009–4012Publication D…
Abstract The thermal stabilities of structurally uniform polymeric phthalocyanines 2 and their lowmolecular‐weight model compounds 5 were examined. Thermal analyses under inert and oxidative conditions showed that the nature of the metal as well as that of the substituents and end groups has a decisive influence on th…
An isolated anthracene radical anion is present in the crystalline μ-trichlorodimagnesium·6 thf(1+) anthracenide 2. Compound 2 can be obtained from Mg, anthracene, and MgCl2, or from the Mg-complex 1, anthracene, and MgCl2, in each case in tetrahydrofuran (THF).
Procaryotic microorganisms accumulate several polymers in the form of intracellular inclusions as a strategy to increase survival in a changing environment. Such inclusions avoid osmotic pressure increases by tightly packaging certain macromolecules into the inclusion. In the present paper, a model describing changes…
Abstract Optically active trans-2-(arylthio or alkylthio)cyclohexanols are prepared by the asymmetric ring-opening of cyclohexene oxide with various arylthiols or alkylthiols in 52–85% ee by the use of zinc Lq-tartrate as a heterogeneous chiral Lewis acid catalyst.
Abstract In 15 Substances of general formula magnified image transition temperatures, transition enthalpies and entropies, densities and phase transition volumina, order parameters of a dissolved dye and optical refractive indices were measured. Additional miscibility and X‐ray investigations were performed. The resul…
ABSTRACT Differential scanning calorimetry was used to monitor the thermal denaturation kinetics of myofibrillar proteins in bovine muscle at pH 5.6. The activation energy, pre‐exponential factor, rate constant and mean life time for each transition were calculated by means of a dynamic method. The kinetic values and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTC2Hn fragments on metal surfacesJerome Silvestre and Roald HoffmannCite this: Langmuir 1985, 1, 6, 621–647Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissue 1 November 1985https://pubs.acs.org/doi/10.1021/la00066a001https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of the photochemical reactivity of coordination compounds by formation of supramolecular structures: the case of the hexacyanocobaltate(III) anion associated with polyammonium macrocyclic receptorsM. F. Manfrin, L. Moggi, V. Castelvetro, Vincenzo Balzani, M. W. Hosse…
Pulsed dye laser excitation spectroscopy of the 7F0----5D0 transition of Eu(III) reveals only a single peak as this ion is titrated into apocalmodulin. A titration based on the intensity of this transition shows that the first two Eu(III) ions bind quantitatively to two tight sites, followed by weaker binding (Kd = 2…
Abstract— Tetrasulfophthalocyanine and a series of its metal chelates were tested for their ability to photoinactivate V‐79 Chinese hamster cells. Incubation of cells for 1 h with tetrasulfophthalocyanine at 5 μ M effectively sensitized cells towards red light. At the 1% survival level, the dye was 4 x more efficient…