The stoichiometry of single nanoparticles of copper zinc tin selenide

Cu(2)ZnSnSe(4) nanoparticles have high potential to be used as ink for printable solar cells. Using transmission electron microscopy we show that these nanoparticles exhibit a broad range of chemical heterogeneity. These results are contrary to the interpretation of previous experimental work and will have considerable impact on the development of these nanoparticles.     

Electronic structure of pyridine-based SAMs on flat Au(111) surfaces: extended charge rearrangements and Fermi level pinning

Density functional theory calculations are used to investigate the electronic structure of pyridine-based self-assembled monolayers (SAMs) on an Au(111) surface. We find that, when using pyridine docking groups, the bonding-induced charge rearrangements are frequently found to extend well onto the molecular backbone. This is in contrast to previous observations for the chemisorption of other SAMs, e.g., organic thiolates on gold, and can be explained by a pinning of the lowest unoccupied states of the SAM at the metal Fermi-level. The details of the pinning process, especially the parts of the molecules most affected by the charge rearrangements, strongly depend on the length of the molecular backbone and the tail-group substituent. We also mention methodological shortcomings of conventional density functional theory that can impact the quantitative details regarding the circumstances under which pinning occurs and highlight a number of peculiarities associated with bond dipoles that arise from Fermi-level pinning.     

Einen Apparat zur Bestimmung-der Verbrennungsw?rme

Ohne Zusammenfassung     

Zur Kenntnis der Glycose

Ohne Zusammenfassung     

Ueber das Verhalten der Schellackharzs?uren bei der Trennung von Fetts?uren und Harzs?uren nach Gladding und nach Twitchell

Ohne ZusammenfassungAus dem Laboratorium des k. k. technologischen Gewerbe-Museums in Wien.     

Collisional-Radiative Recombination in Argon Plasmas

On the basis of the realistic argon atom model consisting of 65 discrete effective levels numerical results for the collisional-radiative volume recombination, ionization and decay coefficients are obtained. The computations are carried out without any approximations of integral functions. The presented comparison of theoretical and experimental results for the decay coefficient shows that the values calculated by us are in much better agreement with experimental values than those obtained by Desai and Corcoran on the assumption that the argon atom is hydrogen-like.     

Mechanismus der elektronenstossinduzierten Äathylenabspaltung aus dem Ion [C9H11]+ aus 2,5-Dimethylbenzylbromid

By the investigation of ¹³C-labelled dimethylbenzylbromide, it has been shown that the [M – Br]⁺ ion isomerises to a dimethyltrophylium cation.     

The Four Isomeric 1,3,5-Undecatrienes. Synthesis and configurational assignment

The four geometrical isomers of 1,3,5-undecatriene, 1a–d have been prepared (stereospecifically and non-stereospecifically), using either (1) the Wittig reaction, (2) thermal sigmatropic hydrogen shifts, (3) partial reduction of triple bonds by zinc, or (4) organocopper reagents. The thermal behaviour of the four 1,3,5-undecatrienes has been investigated and the products formed have been characterized. The spectra of 1a–d, and of related compounds, have been discussed in order to corroborate their configurational assignment.     

Automatische amperometrische Bestimmung von Calcium und Magnesium durch komplexometrische Titration

Zusammenfassung Eine Methode wurde entwickelt, um Calcium und Magnesium in natürlichen Wässern bei pH 10 an einer Tl₂O₃-Anode unter Verwendung von ÄDTA und ÄGTA als Titrationsmittel zu bestimmen. Die dabei verwendete Apparatur eignet sich gut für Serienbestimmungen, da die Zugabe des Titrationsmittels und die Aufzeichnung des Kurvenverlaufs automatisch erfolgen. Die Auswertung wird graphisch durchgeführt.

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Automatic amperometer determination of calcium and magnesium through complexometric titration

Summary A method has been developed for the determination of calcium and magnesium in natural waters at pH 10 on a Tl₂O₃-anode with employment of EDTA and EGTA as titration agents. The apparatus used is well suited to series determinations, because the addition of the titration agent and the recording of the course of the curve are done automatically. The evaluation is conducted graphically.