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Articles by Michael Daub
Nonahalogenidoarsenates(III) A 3 As 2 X 9 ( A = Rb, Cs, CH 3 NH 3 ; X = Cl─I) as Vacancy-Ordered Triple Perovskites
1 Introduction Nonahalogenidometalates of the general composition A3B2X9 are known with many different combinations of trivalent B3+ and monovalent A+ cations. As A+ cations, we find alkali-metal cations, ns2 cations of group 13 (In+ and Tl+) [1, 2], and also singly charged organic cations.
Between the Sheets: CH3SO3H Molecules Intercalating B2O3 Layers
1 Introduction Methanesulfonic acid, CH3SO3H, is the simplest organic derivative of sulfuric acid, H2SO4. It is a strong Brønsted acid (pKa = −0.6), but less oxidizing compared to H2SO4. Moreover, CH3SO3H is regarded as environmentally benign as it is biodegradable [1, 2–3]. Thus, there are a number of applications for the acid, for example, as electrolyte or as an agent in separation techniques [4, 5].
Synthesis, Crystal Structure, and Optical Properties of the Broadband Emitting [HSC(NH2)2]3PbBr5
1 Introduction Through the discovery of MAPbI3 (MA = [CH3NH3]+, methylammonium) as an absorber material in solar cells[1] and the rapid development of highly efficient perovskite solar cells,[2] metal halide perovskites and related compounds experienced an enormous degree of interest in the corresponding scientific community.[3, 4–5] Due to the excellent semiconductor properties, easy processability from solutions, and adjustable optoelectronic properties through chemical variations, the...
Structures, Bonding Analyses and Reactivity of a Dicationic Digallene and Diindene Mimicking trans‐bent Ditetrylenes
Introduction The multitude of C=C double bonded compounds on the one hand and the unsuccessful syntheses of compounds featuring double bonds between heavier main group elements resulted in the “classical double bond rule”.
Nur ein gut bezahlter Buchhalter? Das muss ein CFO können!
© photon_photo - stock.adobe.com Welche Voraussetzungen muss ein CFO mit sich bringen? In vielen Unternehmen bleibt der Stuhl des Finanzvorstands unbesetzt. Auf den strategischen Überblick eines CFOs zu verzichten, kann deshalb nicht nur wertvolle Erfolgschancen vergeben, sondern bares Geld oder gar die Existenz kosten. Definition eines Chief Financial Officers (CFO) Erstaunlich viele schnell wachsende oder inhabergeführte Unternehmen verzichten auf einen echten Finanzvorstand.
Growth and Characterization of Radiation Sensors Based on Single Crystals of Hybrid Metal-Organic Methylammonium Lead Bromide and Iodide Perovskite
Abstract The inverse temperature (T)‐dependent methods yield single crystals of methylammonium lead halide perovskite with strained lattices. In contrast, the antisolvent diffusion method (antisolvent‐vapor crystallization (AVC)) produces unstrained MAPbBr3 crystals with more uniform growth features and lower density of defects. The powder X‐ray diffraction (XRD) measurements confirm the cubic and the tetragonal structure of the MAPbBr3 and the MAPbI3 samples, respectively.
The Nature of Methylamine-MAPbI3 Complex: Fundamentals of Gas-Induced Perovskite Liquefaction and Crystallization
The Nature of Methylamine-MAPbI3 Complex: Fundamentals of Gas-Induced Perovskite Liquefaction and Crystallization The liquefaction and recrystallization of CH3NH3PbI3 perovskite with methylamine - MA0/CH3NH2 gas in solar cells have been intensively studied in the past years, yet the exact mechanisms remained hypothesized and unclear due to lack of experimental evidence.
Improvement of preventive fire protection at a tank farm
Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive fire protection is of major importance. When rehabilitation of such a tank farm is planned, contractors often recommend extensive – and thus costly – measures. A fire-protection solution developed by TÜV SÜD demonstrates that an equivalent level of safety can also be reached with a far more cost-effective solution.
Borosulfates - Synthesis and structural chemistry of silicate analogue compounds
Review Hubert Huppertz Corresponding Author E-mail address: hubert.huppertz@uibk.ac.at Universitat Innsbruck, Institut für Allgemeine, Anorganische und Theoretische Chemie, Innrain 80-82, 6020 Innsbruck, AUSTRIA Search for more papers by this author PDF PDF Share Abstract Borosulfates are oxoanionic compounds consisting of condensed sulfur– and boron–centered tetrahedra.
Borosulfates-Synthesis and Structural Chemistry of Silicate Analogue Compounds
Abstract Borosulfates are oxoanionic compounds consisting of condensed sulfur‐ and boron‐centered tetrahedra. Hitherto, they were mostly achieved from solvothermal syntheses in SO3‐enriched sulfuric acid, or from reactions with the superacid H[B(HSO4)4]. The crystal structures are very similar to those of the corresponding class of silicates and their substitution variants, especially regarding the typical structural motif of corner‐sharing tetrahedra.
Early fire detection saves cost
On the premises of a tank farm in Bavaria, Germany, defects were found in the fire extinguishing equipment. The operator commissioned TÜV SÜD Industrie Service to draw up a fire-protection concept for the refurbishment. Deviating from the technical regulations, a more cost-effective variant was proposed, coordinated with the responsible authorities and implemented. Early fire detection with thermal imaging cameras was introduced as an essential part of damage control.
Early fire detection saves cost
On the premises of a tank farm in Bavaria, Germany, defects were found in the fire extinguishing equipment. The operator commissioned TÜV SÜD Industrie Service to draw up a fire-protection concept for the refurbishment. Deviating from the technical regulations, a more cost-effective variant was proposed, coordinated with the responsible authorities and implemented. Early fire detection with thermal imaging cameras was introduced as an essential part of damage control.
Going Homoleptic: Synthesis and Full Characterization of Stable Manganese Tetranitrosyl Cation Salts
The full text of this article hosted at iucr.org is unavailable due to technical difficulties. Communication Going Homoleptic: Synthesis and Full Characterization of Stable Manganese Tetranitrosyl Cation Salts Brandon Derstine M. Sc. Jan Bohnenberger, Brandon Derstine, Dr. Michael Daub, Prof. Dr. I. Krossing, Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstr. 21, 79104 Freiburg, Germany.
Stable salts of the hexacarbonyl chromium(I) cation and its pentacarbonyl-nitrosyl chromium(I) analogue
Abstract Homoleptic carbonyl radical cations are a textbook family of complexes hitherto unknown in the condensed phase, leaving their properties and applications fundamentally unexplored. Here we report on two stable 17-electron [Cr(CO)6]•+ salts that were synthesized by oxidation of Cr(CO)6 with [NO]+[Al(ORF)4]− (RF = C(CF3)3)) in CH2Cl2 and with removal of NO gas.
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