Search

Your search keyword '"Ossinger, Sascha"' showing total 22 results
Start Over Author "Ossinger, Sascha"
22 results on '"Ossinger, Sascha"'

3. Three-State Switching of an Fe Spin Crossover Complex

Author

Johannsen, Sven, Schüddekopf, Sascha, Ossinger, Sascha, Grunwald, Jan, Tuczek, Felix, Gruber, Manuel, and Berndt, Richard

Subjects
General Energy, Physical and Theoretical Chemistry, Physik (inkl. Astronomie), Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Published
2022

4. Spin Crossover in a Cobalt Complex on Ag(111)

Author

Johannsen, Sven, primary, Ossinger, Sascha, additional, Grunwald, Jan, additional, Herman, Alexander, additional, Wende, Heiko, additional, Tuczek, Felix, additional, Gruber, Manuel, additional, and Berndt, Richard, additional

Published
2022
Full Text
View/download PDF

10. Effect of ligand methylation on the spin-switching properties of surface-supported spin-crossover molecules

Author

Ossinger, Sascha, primary, Kipgen, Lalminthang, additional, Naggert, Holger, additional, Bernien, Matthias, additional, Britton, Andrew J, additional, Nickel, Fabian, additional, Arruda, Lucas M, additional, Kumberg, Ivar, additional, Engesser, Tobias A, additional, Golias, Evangelos, additional, Näther, Christian, additional, Tuczek, Felix, additional, and Kuch, Wolfgang, additional

Published
2019
Full Text
View/download PDF

14. Crystal structure of bis(5-bromo-1,10-phenanthroline-κ<span class="sup">²</span><span class="it">N</span>,<span class="it">N</span>′)bis­[di­hydro­bis­(pyrazol-1-yl)borato-κ<span class="sup">²</span><span class="it">N</span><span class="sup">²</span>,<span class="it">N</span><span class="sup">2′</span>]iron(II) toluene disolvate.

Author

Ossinger, Sascha, Na¨ther, Christian, and Tuczek, Felix

Subjects
*IRON compounds, *CRYSTAL structure, *MAGNETIC measurements, *METAL complexes, *TOLUENE, *SPIN crossover
Abstract

The structure determination of the title compound was undertaken as part of a project on the modification and synthesis of new spin-crossover (SCO) compounds based on octa­hedral FeII bis­(pyrazol­yl)borate complexes. In the course of these investigations, the compound [Fe(C6H8BN4)2(C12H7BrN2)] was synthesized, for which magnetic measurements revealed an incomplete spin-crossover behaviour. Crystallization of this compound from toluene led to the formation of crystals of the toluene disolvate, [Fe(C6H8N4B)2(C12H7N2Br)]·2C7H8. Its asymmetric unit comprises two discrete metal complex mol­ecules and two toluene solvent mol­ecules. One of the latter is severely disordered and its contribution to the diffracted intensities was removed using the SQUEEZE routine [Spek (2015). Acta Cryst. C71, 9–18]. In each complex mol­ecule, the FeII cation is coordinated by the two N atoms of a 5-bromo-1,10-phenanthroline ligand and by two pairs of N atoms of chelating di­hydro­bis(pyrazol-1-yl)borate ligands in the form of a slightly distorted octa­hedron. The discrete complexes are arranged in columns along the a-axis direction with the toluene solvate mol­ecules located between the columns. The 5-bromo-1,10-phenanthroline ligands of neighbouring columns are approximately parallel and are slightly shifted relative to each other, indicating π–π inter­actions. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

15. Crystal structure of bis{(3,5-dimethylpyrazol-1-yl)- dihydro[3-(pyridin-2-yl)pyrazol-1-yl]borato}iron(II).

Author

Ossinger, Sascha, Na¨ther, Christian, and Tuczek, Felix

Subjects
*CRYSTAL structure, *X-ray powder diffraction, *CHEMICAL bond lengths, *MAGNETIC measurements, *HYDROGEN bonding, *IRON powder
Abstract

he structure determination of [Fe(C13H15BN5)2] was undertaken as part of a project on the modification of the recently published spin-crossover (SCO) complex [Fe{H2B(pz)(pypz)}2] (pz = pyrazole, pypz = pyridyl­pyrazole). To this end, a new ligand was synthesized in which two additional methyl groups are present. Its reaction with iron tri­fluoro­methane­sulfonate led to a pure sample of the title compound, as proven by X-ray powder diffraction. The asymmetric unit consists of one complex mol­ecule in a general position. The FeII atom is coordinated by two tridentate N-binding {H2B(3,5-(CH3)2-pz)(pypz)}− ligands. The Fe—N bond lengths range between 2.1222 (13) and 2.3255 (15) Å, compatible with FeII in the high-spin state, which was also confirmed by magnetic measurements. Other than a very weak C—HN non-classical hydrogen bond linking individual mol­ecules into rows extending parallel to [010], there are no remarkable inter­molecular inter­actions. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

16. Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface

Author

Kipgen, Lalminthang, primary, Bernien, Matthias, additional, Ossinger, Sascha, additional, Nickel, Fabian, additional, Britton, Andrew J., additional, Arruda, Lucas M., additional, Naggert, Holger, additional, Luo, Chen, additional, Lotze, Christian, additional, Ryll, Hanjo, additional, Radu, Florin, additional, Schierle, Enrico, additional, Weschke, Eugen, additional, Tuczek, Felix, additional, and Kuch, Wolfgang, additional

Published
2018
Full Text
View/download PDF

19. Crystal structure of bis[dihydrobis(pyrazol-1-yl)-borato-κ²N²,N2'](1,10-phenanthroline-κ²N,N0)-zinc(II).

Author

Ossinger, Sascha, Näther, Christian, and Tuczek, Felix

Subjects
*CRYSTAL structure, *ZINC compounds synthesis, *ZINC, *LIGANDS (Chemistry), *BORATES, *ATOMS
Abstract

The asymmetric unit of the title compound, [Zn(C6H8N4B)2(C12H8N2)], comprises one half of a ZnII cation (site symmetry 2), one dihydrobis(pyrazol-1-yl)borate ligand in a general position, and one half of a phenanthroline ligand, the other half being completed by twofold rotation symmetry. The ZnII cation is coordinated in form of a slightly distorted octahedron by the N atoms of a phenanthroline ligand and by two pairs of N atoms of symmetry-related dihydrobis(pyrazol-1-yl)borate ligands. The discrete complexes are arranged into columns that elongate in the c-axis direction with a parallel alignment of the phenanthroline ligands, indicating weak π-π interactions. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

20. Vacuum-Evaporable Spin-Crossover Complexes in Direct Contact with a Solid Surface: Bismuth versus Gold

Author

Ossinger, Sascha, primary, Naggert, Holger, additional, Kipgen, Lalminthang, additional, Jasper-Toennies, Torben, additional, Rai, Abhishek, additional, Rudnik, Julian, additional, Nickel, Fabian, additional, Arruda, Lucas M., additional, Bernien, Matthias, additional, Kuch, Wolfgang, additional, Berndt, Richard, additional, and Tuczek, Felix, additional

Published
2017
Full Text
View/download PDF

22. Vacuum-Evaporable Spin-Crossover Complexes in Direct Contact With a Solid Surface: Bismuth vs. Gold

Author

Ossinger, Sascha, Naggert, Holger, Kipgen, Lalminthang, Jasper-Toennies, Torben, Rai, Abhishek, Rudnik, Julian, Nickel, Fabian, Arruda, Lucas M., Bernien, Matthias, Kuch, Wolfgang, Berndt, Richard, and Tuczek, Felix

Abstract

To investigate the ability for spin-state switching of spin-crossover (SCO) complexes adsorbed to solid substrates, the SCO complex [Fe(H2B(pz)2)2(phenme4)] (pz = pyrazole, phenme4 = 3,4,7,8-tetramethyl-1,10-phenanthroline) is prepared. The new complex is investigated by magnetic susceptibility measurements and Mößbauer spectroscopy in the solid state and by temperature-dependent UV/Vis-spectroscopy in a thin film deposited by physical vapour deposition (PVD) on quartz glass. Thermal and light-induced SCO are observed in the bulk and the film on glass. Submonolayers of this complex obtained by PVD are studied by temperature-dependent near-edge x-ray absorption fine structure (NEXAFS) on Au(111) as well as Bi(111) and by scanning tunneling microscopy (STM) on Au(111). NEXAFS shows thermal and light-induced spin-state switching of the complex on Bi(111), however, with a large temperature-independent high-spin fraction (~ 50%). On the other hand, combined evidence from NEXAFS and STM indicates that on Au(111) the complex dissociates into [Fe(H2B(pz)2)2] and phenme4. Similar observations are made with the parent complex [Fe(H2B(pz)2)2(phen)], which on Bi(111) stays intact and exhibits thermal as well as light-induced SCO, but on Au(111) dissociates into [Fe(H2B(pz)2)2] and phen.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results