Solvent effects on the electron donor acceptor complex properties of ferrocene and tetranitromethane

Summary Spectral investigations in the 350–800 nm range of ferrocene (FcH) and tetranitromethane [C(NO₂)₄] solutions in cyclohexane and carbon tetrachloride at concentration-constant (FcH) and variable (tetranitromethane) were made. The electron donor acceptor (EDA) complex of ferrocene and tetranitromethane and its dissociation to the ferricenium cation (FcH⁺) were studied as a function of the solvent, the initial C(NO₂)₄ concentration and reaction time.     

Behaviour of copper(II) and nickel(II) dialkyldithiocarbamates on polar and non-polar stationary phases

Summary Fifteen Dialkyldithiocarbamate complexes each of copper(II) and Ni(II) have been prepared and the retention times of these complexes have been measured on the non-polar OV-101 phase and the polar NGA and OV-225 phases. The relationship has been studied between the retention characteristics of the complexes and their structure. The lenght of the alkyl substituent, regarded as a steric hindrance, turned out to affect the retention of the complexes on the non-polar phases.

---

Verhalten von Kupfer(II)- und Nickel(II)-dialkyldithiocarbamaten auf polaren und unpolaren stationären Phasen

Zusammenfassung Je 15 Dialkyldithiocarbamatkomplexe von Kupfer(II) und Nickel(II) wurden dargestellt und ihre Retentionszeiten auf der unpolaren Phase OV-101 sowie den polaren Phasen NGA und OV-225 gemessen. Die Beziehung zwischen der Retentionscharakteristik der Komplexe und ihrer Struktur wurde untersucht. Es zeigte sich, daß die Länge des Alkylsubstituenten (als sterische Hinderung) die Retention auf der unpolaren Phase beeinträchtigt.

     

Klassische Lösungen nichtlinearer Wellengleichungen im Großen

Ohne ZusammenfassungDies ist der erste Teil einer Arbeit, die von der Mathematisch-Naturwissenschaftlichen Fakultät der Georg-August-Universität zu Göttingen als Dissertation angenommen wurde. Ich erlaube mir, an dieser Stelle Herrn Prof. Dr. E. Heinz für viele wertvolle Hinweise zu danken.     

Strukturbestimmung von Kohlenwasserstoffen durch Protonenresonanz

Ohne Zusammenfassung     

Molrefraktion elementorganischer Verbindungen, 1. Mitt.: Enileitung. Die Refraktion der Sn−C-Bindung

Zusammenfassung Die Berechnung der Sn–C-Bindungsrefraktionskonstante anhand der Daten von 287 Verbindungen aus 112 Literaturzitaten ergibt die in Tabelle 5 zusammengefaßten Ergebnisse. Bei der Beteiligung eines aromatisch oder konjugiert mehrfachgebundenen Kohlenstoffatoms an der Sn–C-Bindung sind die gefundenen Sn–C-Bindungsrefraktionskonstaten wesentlich höher als im Falle eines primären oder sekundären Alkyl- oder isoliert mehrfach-gebundenen Kohlenstoffatoms.

---

Results of the calculation of Sn–C bond refraction constants for 287 compounds, based on data from 112 references, are presented in table 5. Accordingly, Sn–C bond refraction constants appear to be essentially higher for carbon atoms with aromatic or conjugated multiple bonds than for primary or secondary carbon atoms in alkyl groups or carbon atoms with isolated multiple bonds. *** DIRECT SUPPORT *** A3615129 00004

     

Atomic masses above146Gd derived from a shell model analysis of high spin states

From a shell model analysis of high-spin states in neutron deficient nuclei above¹⁴⁶Gd we have derived the ground state masses of theN=82 and 83 isotones of Eu, Tb, Dy, Ho, and Er. The results can be used to calculate the energies of aligned multiparticle yrast configurations. They also link ten α-decay chains to the nuclei with known masses, providing many new absolute mass values which are compared with predictions. An examination of the two-proton separation energies atN=82 shows an 0.5 MeV break in the nuclear mass surface atZ=64.     

Anisotropy of NMR relaxation,and diffusion,of penetrants in stretched cis-polyisoprene

We have measured ¹H and ¹⁹F NMR relaxation times T₁, T_1ρ, and T₂, and diffusion constants, in trace penetrants hexafluorobenzene and n-hexadecane dissolved in stretched cis-polyisoprene, as function of temperature, rubber elongation, and angle with respect to the stretch direction. Values of T₁ and T₂ in the rubber were also measured. At all temperatures (—40 ≤ T ≤ 85°C), T₁ in rubber and penetrants is isotropic and independent of elongation; the differences between rubber and penetrants are related to penetrant diffusion. All T₂ above—15°C are anisotropic and elongation dependent, and follow a motional narrowing model. For the penetrants, averaging the dipolar interactions implies averaging over a diffusion path; this correctly reproduces the observed much higher T₂ anisotropy in the penetrants. Penetrant diffusion rates, however, are essentially isotropic and elongation independent. These effects depend only weakly on the shape of the penetrant molecules.     

Nanosecond optical pulse shaping in cadmium-sulfide-selenide glasses

Transmission characteristics of a nonlinear Fabry-Perot interferometer containing Cd(S, Se)-glasses were measured using laser pulses of 10 ns duration. The interferometer functioned as an optical limiter and optical discriminator. Optical bistability has not been observed, probably because of the finite relaxation time of the nonlinear effects.