Materials Literature
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Abstract This paper is a report on the structure determination by X-ray analysis of the nickel(II)-1,8,8,13,13-pentamethyl-5-cyano-trans-corrin chloride, the synthesis of which is described by Eschenmoser et al. in the preceding paper. There are two reasons that led us to carry out this work. In the first place, it wa…
Abstract In 1963 a description of the work in progress at the laboratories of the E.T.H. towards the synthesis of corrins was presented (Eschenmoser 1963). At that time, we were able to report the synthesis of the analytically and spectroscopically well defined crystalline nickel complex I; however, the ultimate probl…
Received 18 October 1965DOI:https://doi.org/10.1103/PhysRevLett.15.784©1965 American Physical Society
The infrared-absorption spectra of a selection of aluminum-doped and nominally boron-doped semiconducting synthetic diamonds have been measured from 1 to 10 \ensuremath{\mu} at temperatures near 100\ifmmode^\circ\else\textdegree\fi{} and 300\ifmmode^\circ\else\textdegree\fi{}K. These spectra are shown to be very simil…
Alignment by electric or magnetic fields of molecules comprising the liquid crystalline phase of a nematogenic material is manifested in proton magnetic resonance spectroscopy by the appearance of nuclear dipole-dipole fine structure. Additionally, much larger splittings ranging up to 300 G are observed in the deuteri…
Using a recently proposed procedure, the localized molecular orbitals are determined for minimal-basis-set LCAO—SCF wavefunctions of the molecules LiH, BH, NH, FH, Li2, B2, Be2, N2, F2, CO, BF, LiF. In all cases, well-defined inner-shell, lone-pair, and bond orbitals are found. They exhibit a considerable degree of tr…
The defect distribution in an ionic crystal is calculated for both pure crystals and crystals containing divalent cationic impurities. By taking the electrostatic energy into account explicitly, it is shown that bulk electrical neutrality and space-charge regions surrounding the vacancy sources are an inherent aspect…
A nuclear-magnetic-resonance method is explored, which effectively attenuates the dipolar interaction in solids. The experimental technique corresponds to the observation of a free-induction decay in a frame of reference rotating with the frequency of an applied rf field. When the amplitude ${H}_{1}$ of this field is…
Distribution of magnesium and strontium was determined between waters and calcites secreted by the oyster species Crassostrea virginica and C. rhizophorae in natural habitats at eight localities, from Maine to Puerto Rico. The concentration of strontium in the calcite shells increases with increasing temperature in th…
The Wagner equation for the isothermal oxidation of metals is re-established. One of the assumptions used in deriving the equation is removed.
In this study of Neoprene W, it has been possible to show that this elastomer possesses a fairly wide distribution of molecular weights and presents some degree of branching. The relationship \documentclass{article}\pagestyle{empty}\begin{document}$\left[ {\bar \eta } \right]$\end{document} = 2.90 × 10−3M has been est…
Abstract A number of N,N‐dialkylamides have been prepared, characterized and evaluated as plasticizers for poly (vinyl chloride‐vinyl acetate) copolymer. Among these are the N‐oleoyl derivatives of diisopropyl, dibutyl, diisobutyl, diamyl, dihexyl, diheptyl, dioctyl, di‐2‐ethylhexyl and didecylamines. Also included ar…
Lifetimes and relative quantum yields of phosphorescence were measured over the temperature range −10° to −196°C for solutions of palladium (II) mesoporphyrin IX, dimethyl ester, and ρ-phenylbenzophenone in methylphthalylethylglycolate. The observed variation in the rate constants for the unimolecular decay of the tri…
Donella H. Turner, E. S. Blanch, Martin Gibbs, J. F. Turner; Triosephosphate Isomerase of Pea Seeds 12, Plant Physiology, Volume 40, Issue 6, 1 November 19
In a previous paper the correlation function formula for the thermal conductivity was used to derive equations for the lowest-order contribution to the lattice thermal conductivity Kij. An explicit but formal solution of these equations is obtained here, and it is shown how this solution simplifies in the limit of inf…
Mathematical descriptions of the stress-strain-time behavior of plastic crystals are developed using a statistical approach to dislocation dynamics. First, the ``easy-glide'' portions of stress-strain curves are described in terms of glide band propagation. Then, three models of strain hardening are developed and used…
Transmittance measurements of optical materials were made at 25°C, 100°C, 200°C, 300°C, and 400°C in the 1-μ to 12-μ range with a Perkin-Elmer Model 21 spectrophotometer. A continuous proportioning temperature control system, using a modified Loyola LC-2 4KVA Power Manipulator in conjunction with a Wheelco Capacitrol,…
The breakdownof the air-formed oxide film on iron is greater upon immersion in corrosive than inhibitive solutions; it is retarded by dissolved oxygen and in some solutions marginally affected by the age, or thickness,of the film. The breakdown is not due to direct solution, as with aluminium, but to reductive dissolu…
The effect of pressure, up to 50 kbar, on the low-frequency dielectric constant $\ensuremath{\epsilon}$ of SrTi${\mathrm{O}}_{3}$ has been measured at 25\ifmmode^\circ\else\textdegree\fi{}C. $\ensuremath{\epsilon}$ decreases with increasing pressure according to the relation $\ensuremath{\epsilon}=\frac{{C}^{*}}{(p\en…
Article Die Absorption der Röntgenstrahlen im Dreistrahlfall der Interferenz was published on November 1, 1965 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 121, issue 1-6).