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The luminescence of Yb 2+ in alkaline earth phosphates and vanadates is reported. Particular attention has been given to those compositions possessing apatite and spodiosite structures. Emissions from Yb 2+ are broad and sensitive to host composition. Single and double emission bands are observed which exhibit a varie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetabolic fate of phenyltrimethylsilane and phenyldimethylsilaneRalph J. Fessenden and Ray A. HartmanCite this: J. Med. Chem. 1970, 13, 1, 52–54Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.…
The corrosion behavior of zinc in at 25° C was investigated through measurement of the rate of hydrogen evolution at the corrosion potential. Anodic and cathodic potentiostatic polarization curves as a function of alloying and additions to the electrolyte were obtained. It was found that the corrosion and polarization…
The crystal structure of benzylideneacetophenone (chalcone) has been solved from photographically recorded partial three-dimensional data by means of the SEARCH computer programme and refined to discrepancy indices R′= 0·017 and R= 0·055. The C–C and C–O bond lengths have been determined with estimated standard deviat…
Abstract The technique of two‐photon‐absorption spectroscopy with polarized laser‐light is applied to localized excitations of 4f‐electrons in crystals. The relevant selection rules are discussed. A method is outlined for the unique determination of the relative magnitude of partial transition‐probabilities with diffe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of 2,2',2"-terpyridineDavid W. Fink and William E. OhnesorgeCite this: J. Phys. Chem. 1970, 74, 1, 72–77Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.acs.org/doi/10.1021/j100696…
Previous measurements of the thermal conductivity of TiC, ZrC, and NbC by the present authors showed that at low temperatures the phonon‐electron scattering in these materials is strong and gives rise to an unusual temperature dependence of the lattice thermal conductivity. The Callaway analysis of those data is now e…
Tetrafluorophthalonitrile reacts with a variety of metals and metal halides to give halogenophthalocyanines. The reaction with zinc, zinc bromide, or zinc iodide gives zinc hexadecafluorophthalocyanine in good yield, but zinc chloride, iron(III) chloride, and aluminium chloride react to give mixtures of polychloropoly…
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Polycrystalline copper of 99·99% purity has been deformed in tensile creep at a variety of strain rates and temperatures. The internal stress developed during creep deformation was measured by a modified stress-relaxation technique. The magnitude of the internal stress remains constant during steady-state deformation…
Boron co-ordination compounds of the type L,BH3(L = Me3N, Et3N, Py, and Et3P) and Me3N,BH2X (X = Cl, Br, and I) are shown to form hydrogen-bonded complexes with OH (MeOH, PhOH, and p-F·C6H4·OH) in carbon tetrachloride solution. These complexes appear to be formed via OH ⋯ BH3 and OH ⋯ BH2 interactions and are readily…
The electronic spectra of the octahedral Tecl_6^(2-) and TeBr+6^(2-) complexes are reported and assigned. \nThe s → p transition a_(lg)σ^* → t_(lu)σ^* gives rise to three spin-allowed bands in TeCl_6^(2-) (32,880; 34,480; 35,680 cm^(-1)) and TeBr_6^(2-) (28,470; 29,730; 30,850 cm^(-1)). These data are taken as evi…
Divalent europium was used as an activator in Ba‐Ca, Ba‐Sr, and Ca‐Sr orthophosphate and pyrophosphate compositions. Luminescence was observed in most of the compositions and spectral energy distribution measurements were made on all samples. Changes in the mixed cation ratios produced variations in emission band inte…
Abstract Partially polarized luminescence is observed for Ga + , In + , and Tl + centres in alkali halides of CsCl‐type structure at liquid nitrogen temperature. The symmetry of excited Ga + , In + , and Tl + centres is established to be tetragonal in the most crystals investigated. The symmetry of Tl + centres in CsI…
Abstract A novel and simple fiber formation process has been developed to fabricate aromatic polyoxadiazoles. The aromatic copolyoxadiazole solution prepared from terephthalic acid, isophthalic acid, and hydrazine sulfate in fuming sulfuric acid was utilized directly as spinning solution and was successfully wet‐spun…
The preparation and physical properties are reported of a number of new binuclear µ-nitrido-complexes of osmium and ruthenium, of the form [M2IVNX8(H2O)2]3–(M = Os or Ru; X = Cl or Br); [Ru2N(NCS)8(H2O)2]3–; [Ru2N(NO2)6(OH)2(H2O)2]3–; [Os2N(NH3)8X2]3+(X = Cl, Br, l, NCS, NO3, or N3); [Ru2N(NH3)8X2]3+(X = Cl, Br, or NO…
The single-crystal polarised electronic and e.s.r. spectra of dichlorobis-(2-methylpyridine)copper(II) have been measured. The single-crystal g-values correlate with the monomeric local copper(II) co-ordinate axes and not with the co-ordinate axes of the dinuclear copper(II) species; they suggest a dx2–y2 ground state…
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Abstract The production of dry matter and the uptake of nutrients by corn ( Zea mays L.) from soil adjusted to different levels of salinity with a mixture of salts were evaluated and compared with results obtained with barley ( Hordeum vulgare L.). Soil salinity levels ranging from EC values of 0 to 16 mmhos/cm of the…