Materials Literature
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The 1H n.m.r. spectra of some lanthanide(III) complexone complexes have been studied. The investigation showed that these complexes exist in states of fast exchange between different conformations on the surface of the metal ion. Measurements of the relaxation enhancements of water in the presence of these complexes s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron reduction of ferrideuterioporphyrin IX and reaction of the oxidized and reduced forms with chlorinated methyl radicalsD. Brault, C. Bizet, P. Morliere, M. Rougee, E. J. Land, R. Santus, and A. J. SwallowCite this: J. Am. Chem. Soc. 1980, 102, 3, 1015–1020Publica…
Article The Identification of Diatoms Isolated as Endosymbionts from Larger Foraminifera from the Gulf of Eilat (Red Sea) and the Description of 2 New Species, Fragilaria shiloi sp. nov. and Navicula reissii sp. nov. was published on January 1, 1980 in the journal Botanica Marina (volume 23, issue 1).
The crystal and molecular structure of [{CuBr(OCH2CH2NEt2)}4]·4CCl4(A) has been determined from three-dimensional X-ray diffractometer data and refined to R 0.061 using 1 581 independent reflections. The tetragonal unit cell of space group I41/a with dimensions a= 19.47(2) and c= 15.78(1)Å contains four oxygen-bridged…
In low‐alloy steels under accelerated atmospheric corrosion conditions the type of weathering, particularly the ratio of the time of wetness to the drying time, has a greater influence on the corrosion behavior than does the composition of the alloys. Electrochemical measurements show that the rust protection is not o…
Abstract [Au 9 L 8 ] 3+ reacts with L to give [Au 8 L 8 ] 2+ via the intermediate [Au 8 L 7 ] 2+ . The reaction of [Au 9 L 8 ] 3+ with SCN − and Cl − results in the formation of [Au 11 L 8 (SCN 2 ] + and [Au 11 L 8 Cl 2 ] + , respectively. [Au 8 L 8 ] 2+ acts as an intermediate in this conversion of Au 9 into Au 11 .…
This study was carried out to examine a possibility of evaluating the SCC susceptibility of stainless steels in high-temperature water by EPR test (Electrochemical Potentiokinetic Reactivation method). The effect of alloying elements of carbon, nitrogen and molybdenum on the extent of sensitization was evaluated by EP…
Molecular relaxations in the glassy state of amorphous polymers are discussed, and related to the energy requirements of the various possible molecular motions involved under two broad headings: those occurring in groups pendant to the main chain and those occurring in the main chain units themselves. A variety of mot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatic and Dynamical Properties of Polystyrene in trans-Decalin. 4. Osmotic Compressibility, Characteristic Lengths, and Internal and Pseudogel Motions in the Semidilute RegimeB. Chu and T. NoseCite this: Macromolecules 1980, 13, 1, 122–132Publication Date (Print):January 1,…
The crystal structure of silver(I) imidazole perchlorate reveals the presence of a planar (Ag+)6, cluster, in which three radiating pairs of Ag+ ions 3.051(1)Å apart are disposed on the corners of an equiliateral triangle, the inner Ag+ ions being 3.493(1)Å apart. Each silver ion carries two linearly co-ordinated imid…
The crystal and molecular structure of the β-polymorphic form of phthalocyaninatocobaIt(II), [Co(pc)], has been determined by single-crystal neutron-diffraction methods at 4.3 K. Crystals are monoclinic, space group P21/c, with a= 14.495(5), b= 4.742(4), c= 19.107(5)Å, β= 120.76(2)°, and Z= 2. Automatic diffractometry…
Abstract Die Zustandsdiagramme AsS und AsSe wurden in einem Differential‐Scanning‐Calorimeter bestimmt. Es wurde gezeigt, daß die Käfigmoleküle As 4 Se 3 und wahrscheinlich As 4 Se 3 im Gleichgewichtsphasendiagramm enthalten sind. Die verschiedenen Modifikationen des As 4 S 4 , As 4 S 3 und As 4 Se 3 wurden rein dar…
The initial oxidation of plutonium metal at 27°C has been studied using AES and XPS. Initially a ’’clean’’ plutonium surface was prepared by prolonged Ar+ bombardment followed by 500°C anneal and Ar+ bombardment cleaning cycles. Changes occurring in the plutonium Auger electron spectra in the energy range of 40–120 eV…
Transmission electron microscopy is used to investigate the spatial arrangement of the small gas bubbles produced in several fcc metals by 30 keV helium ion irradiation to high dose at 300 K. In what is a new result for this important class of metals it is found that the helium gas bubbles lie on a superlattice having…
The object of the Rietveld method is to produce refined values of crystal structural parameters from powder diffraction data. Many materials of great interest can not be made available for study in single crystal form. This may be because it is not possible to prepare a single-crystal form at all (e.g., human tooth en…
Abstract The crystal structure of Zn 4 O(BO 2 ) 6 has been redetermined and refined to an R value of 0.044. The new parameters and the interatomic distances and angles are given.
Conference International Conference on Surface and Colloid Science, International Conference on Surface and Colloid Science, ICSCS, Surface and Colloid Science, Third, Stockholm, Sweden, 1979-08-20–1979-08-25 Published Online: 2009-01-01 Published in Print: 1980-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Measurements of the proton relaxation rates of lanthanide (III) aquo-ion solutions show that the correlation times, which govern the proton relaxation times in these solutions, are very short (ca. 10–13s), and are predominantly due to the electron-spin relaxation times of the cations. The variations in the relaxation…
The vibrational spectra of normal and 2H-enriched carbonate perhydrates M2[CO3]·nH2O2(Na,n= 1.5; K, Rb, or Cs, n= 3; NH4n= 1) and those of the normal and 13C-enriched peroxodicarbonates M2[C2O6](M = Na, K, Rb, or Cs), normal and 13C-enriched Li2[CO4]·H2O, and the salts M[MCO4]·nH2O (Na, n= 1; K, or Rb, n= 0) have been…
The crystal structure of the title compound has been determined by single-crystal X-ray diffraction at 295(1) K and refined by least squares to a residual of 0.034 for 2 874 ‘observed’ reflections. Crystals are triclinic, space group P1, with a= 10.790(2), b= 9.395(3), c= 8.941 (3)Å, α= 60.98(2), β= 88.50(2), γ= 62.31…