Materials Literature
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Many new step-growth polymers containing one or more types of linkages such as amide, ester, urea, and methanes were biodegradable by fungi and enzymes. Suitable substituents, combinations of hydrophilic and hydrophobic segments and long repeating units, contribute to the increase of biodegradability of the polymers.…
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The resistivity of various Fe-Ni-Cr alloys, electron-irradiated at 4·2 K, has been investigated during annealing from 4·2 to 1300 K. The annealing behaviour for these alloys is completely different from that of pure metals, except in the temperature range below 100 K. A large resistivity increase and decrease was obse…
Formation of M(CNPh) 5 py and M(CNIph) 5 py occurs upon 436-nm irradiation of M(CNPh) 6 and M(CNIph) 6 (M = Cr, Mo, W; Iph = 2,6-diisopropylphenyl) in pyridine, with quantum yields descreasing according to [Cr(CNPh) 6 ] (0.23) ~ [Cr(CNIph) 6 ] (0.23) > [Mo(CNPh) 6 ] (0.055) > [Mo(CNIph) 6 ] (0.022) > [W(CNPh) 6 ] (0.0…
The mechanism of antimicrobial activity of the peroxidase-hydrogen peroxide (H(2)O(2))-iodide (I(-)) system was investigated. Inhibition of respiration and loss of viability of Escherichia coli were used as measures of antimicrobial activity. Because the bacteria destroyed H(2)O(2), peroxidase antimicrobial action dep…
Tris(organothiyl)methyl radicals, RnMSC(SR )2, have been generated by the addition of a variety of transient RnM-radicals to the thione sulfur of three trithiocarbonates (dimethyl trithiocarbonate (2), 1,3-dithiolane-2-thione (3), and 1,3-dithiole-2-thione (4)) and their EPR parameters have been measured. All adducts…
Abstract The luminescence behavior of 2-(2-hydroxyphenyl)benzothiazole at 77 K was studied in detail, special attention being paid to dual fluorescence at ≈500 and ≈370 nm and also to phosphorescence at ≈500 nm. From the dependence of these emission bands upon the hydrogen-bonding ability of solvents and the excitatio…
Abstract On heating at temperatures below 600°C kaolinite reacts with salts of alkali metals according to the equation 2SiO 2 · Al 2 O 3 · 2H 2 O + 2 n MX → 2SiO 2 · Al 2 O 3 · n M 2 O + 2 n HX + (2− n )H 2 O The reaction commences with the dehydroxylation of the clay and is favoured by high solubility of the salt and…
Abstract Four ternary compounds with the formulas CaMn 2 P 2 , CaMn 2 As 2 , SrMn 2 P 2 , and SrMn 2 As 2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl 2 Si 2 -type structure (space group P3̅m 1-D 3 3 d) with the lattice constants: CaMn 2 P 2 a = 4,096 ± 0…
The metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed. At 1.25 K oriented single crystals exhibit a two-step metamagnetic transition at applied fields ∼0.8 and 1.6 kG along the b-axis, a single transition at ∼0.7 kG for applied fields along the a* axis, and a singl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and structural relationships among the oligomeric compounds MFe(CO)4 (M = zinc, cadmium, mercury), iron lead tetracarbonyl, cobalt silver tetracarbonyl, and their Lewis base adductsRichard D. Ernst and Tobin J. MarksCite this: Inorg. Chem. 1978, 17, 6, 1477–1484Publ…
The room-temperature (295 K) crystal structures of potassium ferricyanide, K3[Fe(CN)6], have been determined for the simplest monoclinic (a reinvestigation) and orthorhombic polytypes by single- crystal X-ray diffraction. The monoclinic form is P21/c, a 7.047(3), b 10.400(3), c 8.384(3) ?, ß 107.29(3)°, Z 2. The iron…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of para substituent on rates of phenyl ring rotation in gallium complexes of para-substituted tetraphenylporphyrinsS. S. Eaton, D. M. Fishwild, and G. R. EatonCite this: Inorg. Chem. 1978, 17, 6, 1542–1545Publication Date (Print):June 1, 1978Publication History Publis…
Abstract Als erstes Rubidiumthioantimonit wurde aus wäßriger Sulfidlösung Rb 2 Sb 4 S 7 dargestellt und seine Kristallstruktur aufgeklärt. Die Substanz kristallisiert triklin in der Raumgruppe P 1 mit den Gitterkonstanten a = 968,0(5) pm, b = 1193,4(5) pm, c = 723,1(5) pm, α = 87,68(5)°, β = 101,39(5)° und γ = 102,66(…
The main electrochemical requirement for a dissolution-controlled cracking mechanism is considered to be a critical delay in the repassivation time during which a certain coulombic charge flows. The strain rate at the crack tip and the repassivation rate are in a permanent critical state of imbalance. After considerat…
Abstract Als erstes Cäsiumthioantimonit wurde die Verbindung Cs 2 Sb 4 S 7 aus wäßriger Sulfidlösung dargestellt und ihre Kristallstruktur aufgeklärt. Sie kristallisiert monoklin in der Raumgruppe P2 1 / c mit den Gitterkonstanten: a = 1111,2(5) pm. b = 1227,1(5) pm, c = 1163,7(5) pm, ß = 97,60(5)°. Die Elementarzelle…
It is observed that for the same peak flux density and the same operating frequency, the core loss induced by a square-wave voltage drive is less than the loss induced by a sinusoidal voltage drive, which is contrary to what one would normally anticipate. To the best of the author's knowledge, there Is no theory that…
Abstract A mechanism for the degradation of polymer molecules in ultrasonic cavitation has been proposed which takes into account the energy released by imploding cavitation bubbles in the form of hydrodynamic waves. Relationships for degradation rate constant and limiting chain length linking with the cavitation ener…
The levitation forces on metal spheres in magnetic fields of axial symmetry are derived theoretically. Criteria for stability of the center of mass are obtained. It is shown for nonmagnetic samples that the desirable coil configurations are those which provide a constant field gradient along the symmetry axis. The for…
Abstract Depending on the method of preparation ,,NiO”-single crystals of different colours can be synthesized. It is shown by ligand field spectroscopy that the ligand field and interelectronic repulsion parameters are the same for the green, yellow and brown crystals. There is definite spectroscopic evidence, that t…