Synthese von 2‐Amino‐3‐cyano‐pyrrolen
Abstract Es wird eine einfache Synthese für 2‐Amino‐3‐cyano‐pyrrole beschrieben, die in der Kondensation von α‐Hydroxyketonen, primären Aminen und Malonitril besteht.
Materials Literature
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Crystal and molecular structure, electron spin resonance, and electronic spectrum of hexakis(imidazole)copper(II) nitrate
The structure of the title compound has been established by three-dimensional X-ray crystal-structure analysis from diffractometer data. Crystals are monoclinic, space group P21/c, with a= 8·65(1), b= 17·64(1), c= 8·38(1)Å, β= 93·20(10)°, Z= 2. The structure was solved by the heavy-atom approach and molecular paramete…
A Simple Two-Band Theory of Galvanomagnetic Effects in Graphite in Relation to the Magnetic Field Azimuth
A simple two-band theory of galvanomagnetic effects in graphite has been developed so as to involve not only the magnetic field intensity ( H ) but its azimuth (θ) with respect to the c-axis, which successfully accounts for the complicated behavior of transverse magnetoresistance (Δρ/ρ 0 ) in an iron-melt graphite pre…
The Difference Infrared Spectra of Titanium-Containing Vitreous Silica
Vitreous silicas containing up to 10% titania are of significant commercial importance because of their low thermal expansions. Instrumental techniques are being developed to determine the structure of the titanium groups in these glasses in order to relate their reduced thermal expansitivities with structural propert…
Identification of enantiomorphism in crystals by electron microscopy
Simple electron-microscopy techniques are described which allow one to detect the presence of two enantiomorphous forms of a structure within an apparent single crystal. The first method consists of a characterization of the interface between the two enantiomorphs. In the second method advantage is taken of violations…
New adducts of phthalocyaninatocobalt(II) with pyridine and 4-methylpyridine and their vibrational, magnetic, and electronic properties. Part I. Reactivity towards oxygen
Different reaction temperatures have allowed the isolation of 1 : 1 and 1 : 2 adducts of phthalocyaninatocobalt(II) with pyridine and 4-methylpyridine. Thermal, vibrational, and magnetic-susceptibility analyses have provided useful information about the structural properties of these complexes; e.s.r. and electronic s…
Selenium dioxide oxidation of d-limonene. Reinvestigation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelenium dioxide oxidation of d-limonene. ReinvestigationHarbo P. Jensen and K. Barry SharplessCite this: J. Org. Chem. 1975, 40, 2, 264–265Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue 1 January 1975https://doi.org/1…
The shape of the continuous X‐ray spectrum and background corrections for energy‐dispersive electron microprobe analysis
Abstract The shape of the continuous spectrum between 0.5 and 10 keV generated by 10 to 25 keV electrons has been calculated. It is shown that Kramers' law underestimates the intensity generated at low X‐ray energies. However, this is partially compensated by the greater absorption suffered by continuum X‐rays compare…
Development of skin interfacing cannula.
The skin interfacing potential of various velours, felts, foams and rough cast surfaces of some polymers was investigated by bonding these substances to solid core silastic rods using Dow-Corning Medical Adhesive Type A. These dummy cannulae were implanted as skin penetrating rods onto the dorsum of canines, goats, an…
Pair potential for alkali metal halides with rock salt crystal structure. Molecular Dynamics Calculations on NaCl and LiI
A new effective pair potential is proposed. This potential is based on the thermodynamic properties of alkali metal halides in the crystal phase and takes into account the pressure dependence of the compressibility. The form of the new potential is; ϕ(rij)=+ [graphic omitted] + [graphic omitted] exp[–k(rmij–rm0ij)]– […
Failure Mechanisms in Composite Plates Impacted by Blunt-Ended Penetrators
Tests of 0–90° ply fiberglass roving-epoxy plates, impacted by hard steel cylindrical penetrators, have revealed a sequential delamination mechanism, especially well developed in plates having more than one layer of fibers in each unidirectionally reinforced lamina. In these plates the sequential delamination mechanis…
Effect of Heat Treatment on the Martensitic Transformation in TiNi Compound
In order to clarify the effect of heat treatment on the martensitic transformation in the TiNi compound, the electrical resistivity vs temperature curves of TiNi containing hyper-stoichiometric concentration of nickel which were heat-treated under various conditions were obtained. TiNi containing more than 51 at%Ni sh…
Creep Mechanism of AI-Mg Alloys at High Temperatures
Dislocation density, ρ, during steady-state creep of A1–5.54 at.-%Mg alloy was measured as a function of applied stress (oc= 14.7–68.6N/mm2) and of test temperature (T=573–673 K). Effect of the concentration of magnesium (C=0.52–5.54 at.-%) on ρ, was also studied at 573 K. From the present results together with the da…
The Structure of the T′ Phase in the System AI-Cu-Zn
The T'' phase in the system AI-Cu-Zn has been investigated using electron diffraction, X-ray diffraction, and electronprobe microanalysis. It is established that T'' has a rhombohedral structurewith a==8''676 ÅA and α==27.41∘°. This structure is a superlattice based on an assembly of five small CsCI-type cells, joined…
Spin Susceptibilities and Phase Transitions in Some Simple Alkali-TCNQ Salts
Spin susceptibility measurements in crystalline alkali+ TCNQ− salts reveal the occurrence of continuous changes and first-order phase transitions in these salts, except Li+TCNQ−. A consideration of the total free energy of these distorted linear systems, in which the electronic energy results from an elementary one-di…
Zero field splitting of the triplet state of porphyrins. II
The zero field splitting (zfs) for porphyrin is calculated for possible transitions b2u(π), a1u(π), a2u(π) → eg(π*). Calculations are done with pi−electron orbital coefficients determined from extended Hückel calculations on the deprotonated dianion, the free base, and the acid dication. The spin dipole−dipole couplin…
Aqueous Stress Corrosion in Titanium Alloys
The fracture modes, metallurgical and environmental influences, and suggested mechanisms of aqueous stress corrosion cracking in titanium alloys are reviewed. Many observations can be rationalised, but the task of assembling a complete quantitative model is formidable.
Thermodynamic properties and self-diffusion of molten sodium chloride. A molecular dynamics study
Molecular dynamics calculations are reported for liquid sodium chloride simulated by Born–Huggins–Mayer type pair potentials. Thermodynamic properties and self diffusion constants have been obtained for 22 VT points ranging between 1000 and 2000 K and between –1 and 14 kbars. The agreement with experimental data is, o…
An overview of optical data storage technology
Optical techniques for data storage have advanced rapidly during the last decade. Optical data storage presents many unique advantages, notably the high storage density and low access time, not attainable by conventional recording techniques. The special features of optical recording, the proposed materials and techni…
Novel polyviologens: Photochromic redox polymers with film‐forming properties
Abstract Several novel polyamides containing the N , N ′‐dialkyl‐4,4′‐dipyridinium (“viologen”) system were made by interfacial condensation of N , N ′‐bis(aminoalkyl)‐4,4,‐dipyridinium salts with di‐, tri‐, or tetrafunctional acid chlorides. These materials are useful redox polymers which turn deeply colored when red…