Phenylene-Bridged Perylene Monoimides as Acceptors for Organic Solar Cells: A Study on the Structure–Property Relationship

A series of non-fullerene acceptors based on perylene monoimides coupled in the peri position through phenylene linkers were synthesized via Suzuki-coupling reactions. Various substitution patterns were investigated using density functional theory (DFT) calculations in combination with experimental data to elucidate the geometry and their optical and electrochemical properties. Further investigations of the bulk properties with grazing incidence wide angle X-ray scattering (GIWAXS) gave insight into the stacking behavior of the acceptor thin films. Electrochemical and morphological properties correlate with the photovoltaic performance of devices with the polymeric donor PBDB-T and a maximum efficiency of 3.17 % was reached. The study gives detailed information about structure–property relationships of perylene-linker-perylene compounds.     

Anwendung der Massenspektrometrie zur Strukturaufklärung von Alkaloiden. 4. Mitt.: Zur Struktur des Rhazidins

Rhazidin kann durch LiAlH₄-Reduktion in Quebrachamin übergeführt werden. Für den basischen Bestandteil des Alkaloides ergibt sich daher Formel V. Umgekehrt ist die Verbindung V durch Oxydation von Quebrachamin mit Peressigsäure in guter Ausbeute zugänglich.

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Exploring thiol‐yne based monomers as low cytotoxic building blocks for radical photopolymerization

The last decade has seen a remarkable interest in the development of biocompatible monomers for the realization of patient specific medical devices by means of UV‐based additive manufacturing technologies. This contribution deals with the synthesis and investigation of novel thiol‐yne based monomers with a focus on their biocompatibility and also the mechanical properties in their cured state. It could be successfully shown that propargyl and but‐1‐yne‐4‐yl ether derivatives have a significant lower cytotoxicity than the corresponding (meth)acrylates with similar backbones. Together with appropriate thiol monomers, these compounds show reactivities in the range of (meth)acrylates and almost quantitative triple bond conversions. A particular highlight is the investigation of the network properties of photo cured alkynyl ether/thiol resins by means of low field solid state nuclear magnetic resonance spectroscopy. Additionally, dynamic mechanical analysis of those polymers revealed that monomers containing rigid backbones lead to moduli and glass transition temperatures (T_g's), sufficiently high for the fabrication of medical devices by UV based additive manufacturing methods. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 3484–3494     

Normal Spectral Emissivity at 684.5 nm of the Liquid Binary System Fe–Ni

Summary. Normal spectral emissivity at 684.5 nm of the liquid binary system Fe–Ni was measured by means of a fast ohmic pulse heating technique combined with fast ellipsometry. The experimental values observed of all liquid alloys are dependent on composition and temperature in the entire range of mixing. Spectral emissivity was measured for pure iron, Fe90Ni10, Fe80Ni20, Fe64Ni36, Fe50Ni50, Fe40Ni60, Fe30Ni70, Fe20Ni80, and pure nickel. Emissivity data as a function of temperature (at melting and in the liquid phase up to 2300 K) and as a function of the mixing ratio are presented and compared to the few existing literature-values.     

Heat Capacity of Titanium in the Temperature Range 1500 to 1900 K Measured by a Millisecond Pulse-heating Technique

Heat capacity of titanium in the temperature range 1500 to 1900 K was measured by a pulse-heating system, operating in the millisecond time regime. The measurement technique is based on selfheating of a tube-shaped specimen from room temperature to melting in approximately 500 ms and measuring current through the specimen, voltage drop along a defined portion of the specimen, and temperature of the specimen every 0.5 ms. A total of 12 measurements on 3 tube-shaped specimens was made. The reproducibility between individual measurements was 0.4%, between different specimens 0.7%. The extended measurement uncertainty (at a confidence level of 95%) is estimated to be 3%. This revised version was published online in July 2006 with corrections to the Cover Date.     

Anwendungen der Massenspektrometrie zur Strukturaufklärung von Alkaloiden, 7. Mitt.: Neue Alkaloide aus Gonioma Kamassi E. Mey

Zusammenfassung Die Strukturen der in der Rinde von Gonioma Kamassi enthaltenen drei Nebenalkaloide Fluorocarpamin (III), Indolo[2,3-a]-pyridocolin (V) und Dihydro-indolopyridocolin (VI) wurden auf Grund vorwiegend massenspektrometrischer Argumente abgeleitet.

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With the aid of mass spectrometry it was possible to determine the structures of the three minor alkaloids Fluorocarpamin (III), Indolo[2,3-a]pyridocoline (V) and Dihydro-indolopyridocoline (VI), isolated from the bark of Gonioma Kamassi.

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High-pressure,high-temperature thermophysical measurements on tungsten

Abstract

Wire shaped tungsten samples (0.25 mm diameter, 40 mm length, 99.97%) are resistively pulse heated as part of a coaxially built up capacitor discharge circuit. With heating rates of more than 10⁹ K/s, temperatures up to 12000 K are reached. The tungsten wire is contained with the surrounding medium water in a high pressure vessel with sapphire windows and a maximum pressure capability of 0.5 GPa. Time correlated measurements of the current through the wire and the voltage drop across it as well as surface radiation and wire expansion can be performed simultaneously and allow the determination of thermophysical properties for the liquid tungsten (see key words). All measuring systems have rise times less than 10 ns.     

Anwendung der Massenspektrometrie zur Untersuchung von Arzneimitteln, 1. Mitt.: Sulfonamide

Zusammenfassung Sulfonamide geben sehr charakteristische Massenspektren, in denen die für das Sulfanilamid typischen Schlüssel-Bruchstücke überwiegen. Sulfonamide, die am N-1 stark elektrophile Substituenten tragen und dadurch an dieser Stelle des Moleküls eine partielle positive Ladung besitzen, zerbrechen bevorzugt unter Eliminierung des stabilen SO₂-Moleküls.Mit 13 Abbildungen