FG Anorganische Chemie - Festkörper- und Materialchemie

81 Items

Recent Submissions
Spectroscopic and Crystal-Chemical Features of Sodalite-Group Minerals from Gem Lazurite Deposits

Chukanov, Nikita V. ; Sapozhnikov, Anatoly N. ; Shendrik, Roman Yu. ; Vigasina, Marina F. ; Steudel, Ralf (2020-11-23)

Five samples of differently colored sodalite-group minerals from gem lazurite deposits were studied by means of electron microprobe and wet chemical analyses, infrared, Raman, electron spin resonance (ESR) and UV-Visible spectroscopy, and X-ray diffraction. Various extra-framework components (SO42−, S2− and Cl− anions, S3•−, S2•− and SO3•− radical anions, H2O, CO2, COS, cis- as well as trans- o...

Einfluss des Komplexbildners Pyrophosphat auf die Abscheiderate eines elektrochemischen Zinnabscheideprozesses

Tuna, Kadir (2020)

Die vorliegende Arbeit beschäftigt sich mit der elektrochemischen Zinnabscheidung und liefert ein Konzept für den Abscheidemechanismus aus pyrophosphathaltigen Bädern. Zinnbäder basierend auf dem Komplexbildner Pyrophosphat (PP) zeigten während der Beschichtung einen starken Abfall der Abscheiderate. Untersuchungen im Elektrolyten mit der Quarzmikrowaage belegten, dass Badparameter wie pH-Wert,...

The role of polysulfide dianions and radical anions in the chemical, physical and biological sciences, including sulfur-based batteries

Steudel, Ralf ; Chivers, Tristram (2019-05-24)

The well-known tendency of sulfur to catenate is exemplified by an extensive series of polysulfide dianions [Sn]2− (n = 2–9) and related radical monoanions [Sn]˙−. The dianions can be isolated as crystalline salts with appropriate cations and structurally and spectroscopically characterized. Although the smaller radical monoanions may be stabilized in zeolitic matrices, they are usually formed ...

Physical properties and lattice dynamics of bixbyite-type V2O3

Weber, Dominik A. ; Schwickert, Christian ; Senyshyn, Anatoliy ; Lerch, Martin ; Pöttgen, Rainer (2017-06-28)

Some time ago, we reported the synthesis of bixbyite-type V2O3, a new metastable polymorph of vanadium sesquioxide. Since, a number of investigations followed, dealing with different aspects like electronic and magnetic properties of the material, the deviation from ideal stoichiometry or the preparation of nanocrystals as oxygen storage material. However, most of the physical properties were o...

Mechanochemical Synthesis of Cu2MgSn3S8 and Ag2MgSn3S8

Heppke, Eva Maria ; Klenner, Steffen ; Janka, Oliver ; Pöttgen, Rainer ; Lerch, Martin (2020-01-03)

Two new thiospinels of the type AI2BIICIV3SVI8 were successfully synthesized via a mechanochemical route using binary sulfides and sulfur. Cu2MgSn3S8 and Ag2MgSn3S8 are the first AI2BIICIV3SVI8 compounds with magnesium as divalent cation. The crystal structures of Cu2MgSn3S8 and Ag2MgSn3S8 were refined in the cubic space group Fd3m using X‐ray powder diffraction. According to UV/Vis measurement...

And yet it moves: a high-temperature neutron diffraction study of ion diffusion in the inverse perovskites BaLiX3 (X = F, H, D)

Wiedemann, Dennis ; Heppke, Eva Maria ; Franz, Alexandra (2019-12-03)

Despite the interest in (anti‐)perovskites and diverse hydrides as hydride conductors and all‐solid‐state battery materials, little experimental evidence on anion diffusion in these compounds is available. Herein, we use neutron diffraction at high temperatures to discover pathways and estimate activation barriers of anion migration in mechanosynthesized powders of BaLiF3, BaLiH3, and BaLiD3. W...

Invariom-model refinement and Hirshfeld surface analysis of well-ordered solvent-free dibenzo-21-crown-7

Wiedemann, Dennis ; Kohl, Julia (2017-08-04)

Crown ethers and their supra­molecular derivatives are well-known chelators and scavengers for a variety of cations, most notably heavier alkali and alkaline-earth ions. Although they are widely used in synthetic chemistry, available crystal structures of uncoordinated and solvent-free crown ethers regularly suffer from disorder. In this study, we present the X-ray crystal structure analysis of...

From the AsCO-anion to new functionalities for the activation of small molecules

Ballestero Martínez, Ernesto (2019)

In recent years, the widespread utility of the [ECO]− (E =P, As) anions has been well received to introduce E atoms into molecules, generating new unusual Main Group and Transition Metal compounds. In this thesis, these anions have been used to synthesize several zinc complexes, some of which can react with silylenes and AlI complexes, forming interesting Lewis species that show new patterns of...

Beiträge zur Chemie neuer Modellverbindungen für Silica mit Sauerstoffdefizit

Paulmann, Jan (2019)

This dissertation provides new insights into the chemistry of silicon suboxide model compounds and a new pathway to silicon monoxide. The investigation of oxygen deficient defects in silica is limited due to their local density and the amorphous character of silica. The synthesis of novel model compounds will support new insights for the investigations of these defects as well as assist the cha...

Structural complexities and sodium-ion diffusion in the intercalates NaxTiS2: move it, change it, re-diffract it

Wiedemann, Dennis ; Suard, Emmanuelle ; Lerch, Martin (2019-09-03)

After momentary attention as potential battery materials during the 1980s, sodium titanium disulphides, like the whole Na–Ti–S system, have only been investigated in a slapdash fashion. While they pop up in current reviews on the very subject time and again, little is known about their actual crystal-structural features and sodium-ion diffusion within them. Herein, we present a short summary of...

Synthesis, characterization, and crystal structure of aqua­bis­­(4,4′-dimeth­­oxy-2,2′-bi­pyridine)[μ-(2R,3R)-tartrato(4−)]dicopper(II) octa­hydrate

Wiedemann, Dennis ; Kulko, Roman-David ; Grohmann, Andreas (2019-06-11)

Typical electroless copper baths (ECBs), which are used to chemically deposit copper on printed circuit boards, consist of an aqueous alkali hydroxide solution, a copper(II) salt, formaldehyde as reducing agent, an L-(+)-tartrate as complexing agent, and a 2,2′-bi­pyridine derivative as stabilizer. Actual speciation and reactivity are, however, largely unknown. Herein, we report on the synthesi...

Untersuchungen zur Züchtung von CuAlO2-Einkristallen

Wolff, Nora (2019)

Die vorliegende Arbeit entstand während meiner Tätigkeit als wissenschaftliche Mitarbeiterin am Leibniz-Institut für Kristallzüchtung in Berlin. Das Ziel der Arbeit war Bedingungen zu definieren, unter denen CuAlO2-Einkristalle aus dem Eigenfluss gezüchtet werden können. Zusätzlich wurden Untersuchungen zum Mischkristallsystem CuAlO2-CuFeO2 gemacht. Mithilfe thermodynamischer Messungen (DTA-TG)...

Commensurate Nb2Zr5O15: Accessible Within the Field Nb2ZrxO2x+5 After All

Wiedemann, Dennis ; Orthmann, Steven ; Mühlbauer, Martin J. ; Lerch, Martin (2019-04-04)

Doped niobium zirconium oxides are applied in field-effect transistors and as special-purpose coatings. Whereas their material properties are sufficiently known, their crystal structures remain widely uncharacterized. Herein, we report on the comparably mild sol–gel synthesis of Nb2Zr5O15 and the elucidation of its commensurately modulated structure via neutron diffraction. We describe the stru...

Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, I Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnV2O4-ZnFe2O4

Riedel, Erwin ; Dützmann, Till ; Pfeil, Norbert (1980)

The spinel system Zn[FexV2-x]O4 has been prepared by heating mixtures of ZnV2O4 and ZnFe2O4 at 1000 °C. The lattice constants increase linearly with x by 3.6 pm, the oxygen parameters are constant with a mean value u = 0.384s. The parameters of room temperature Mössbauer spectra show that in the whole series V(III) and Fe(III) are present.

Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, II Röntgenographische Untersuchung, Seebeck Koeffizienten, Mößbauer-und IR-Spektren der Mischkristallreihen Fe2VO4-ZnV2O4 und Fe2VO4-ZnFe2O4

Riedel, Erwin ; Pfeil, Norbert (1980)

The spinel series Fe2VO4-ZnV2O4 and Fe2VO4-ZnFe2O4 have been prepared and investigated. The lattice constants and Mössbauer spectra lead to a distribution of cations which proves that Fe2VO4 is a partially inverse spinel with Fe(II) and Fe(III) on the tetrahedral site. The Seebeck effect is interpreted with a model of both tetrahedral and octahedral conduction based on charge hopping.

Röntgenstrukturanalyse und Schwingungsspektren von Trischwefeldistickstoffdioxid, S3N2O2 [1]

Steudel, Ralf ; Steidel, Jürgen ; Rautenberg, Norbert (1980)

A redetermination of the crystal and molecular structure of the chain-like molecule S(NSO)2 resulted in the following molecular parameters: d(SO) = 146.5(2), d(S = N) = 153.4(2), d(S-N) = 165.7(2) pm, bond angles OSN = 117.5(1)°, SNS = 123.6(2)°, and NSN = 97.2(1)°, torsion angles OSNS = -0.3(2)°, and SNSN = -177.7(2)° (molecular symmetry C2). Infrared and Raman spectra of S(NSO)2 are reported ...

Di-μ-iodo-bis [dicarbonyl(di-tert-butylphosphin)ruthenium(I)] (Ru-Ru) und Bis(tri-tert-butylphosphonium)-di-μ-iodo-bis[carbonyl-diiodo- (di-tert-butylphosphin)ruthenium(II)]

Schumann, Herbert ; Opitz, Joachim (1980)

[(t-C4H9)3PH]2[{Ru(μI)I2(CO)[P(t-C4H9)2H]}2] is prepared by the reaction of RUC13 · (H2O)x with CO, NaI, and P(t-C4H9)3 in 2-methoxyethanol. Its IR, Raman, and NMR spectra are reported and discussed. [Ru(μ-I)(CO)2P(t-C4H9)2H)2 is obtained by the reaction of [Ru(μ-I)I(CO)3]2 with P(t-C4H9)3 in 2-methoxyethanol. The X18MAA′M′X′18 spin system of its 1H NMR spectrum is analysed.

Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, III Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnFeVO4-Fe3O4

Riedel, Erwin ; Anik, Hümeyra ; Dützmann, Till (1981)

The spinel system Zni_zFe2:[Fei+2;Vi_I]04 has been prepared by heating mixtures of ZnFeV(>4 and Fe3Ü4 at 1000 °C. The lattice constants, the oxygen parameters and the Mössbauer parameters show that a transition from a nearly normal to an inverse distribu-tion of Fe(II) and Fe(III) exists.

Nachweis von Se6, Se7 und Se8 in Lösungen yon Selen mittels Hochdruckflüssigkeitschromatographie

Steudel, Ralf ; Strauss, Eva-Maria (1981)

Dissolution of crystalline Se8 or extraction of glassy or red amorphous selenium, prepared from aqueous SeO2 by reduction, by organic solvents yields solutions containing Se6, Se7 and Se8 in equilibrium as shown by HPLC. The equilibrium explains the concentration dependence of the molar absorbance of such solutions observed earlier. Since the Raman spectrum of red amorphous selenium does not sh...

Metallkomplexe mit Hexamethylentetramin als Ligand: Kristallstruktur des Cadmiumiodid-Addukts 3Cdl2 • 2 C6H12N4 • 4 H2O

Pickardt, Joachim (1981)

The reaction of aqueous solutions of cadmium iodide and hexamethylenetetramine yields crystals of an adduct 3CdI2 • 2CeH12N4 • 4H2O. The crystals are monoclinic, space group P 21/n, Z = 2, a = 811.5(2), b = 1049.2(4), c = 1849.5(6) pm, β = 97.73(2)°. The adduct is polymeric and may be regarded as built up from groups of two tetrahedrally and one octahedrally coordinated Cd(II) ions in which the...