Christoph Schoo
Karlsruhe Institute of Technology
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Featured researches published by Christoph Schoo.
Chemical Communications | 2016
Christoph Schoo; Sebastian Bestgen; Monika Schmidt; Sergey N. Konchenko; Manfred Scheer; Peter W. Roesky
Reduction of [Cp*Fe(η5-E5)] (E = P, As) with divalent lanthanide reagents usually leads to reduction of [Cp*Fe(η5-E5)] followed by a Ln-E bond formation. In contrast, by using the sterically encumbered reagent [(DippForm)2Sm(thf)2] (DippForm = {(2,6-iPr2C6H3)NC(H)[double bond, length as m-dash]N(2,6-iPr2C6H3)}-), ring-opening of thf and reduction of the polypnictide is observed. This leads to two new 3d/4f polyphosphide or polyarsenide complexes [(DippForm)2Sm(Cp*Fe)E5{(CH2)4O}{(DippForm)2Sm(thf)}], in which [(DippForm)2Sm(thf)2] and [Cp*Fe(η5-E5)] are linked by a ring-opened thf molecule and no Ln-E bond formation is observed.
Chemistry: A European Journal | 2016
Sebastian Bestgen; Christoph Schoo; Christina Zovko; Ralf Köppe; Rory P. Kelly; Sergei Lebedkin; Manfred M. Kappes; Peter W. Roesky
OH functionalized triarylphosphines were used to assemble zirconocene-based metalloligands with phosphine donor sites in varying positions. These complexes were subsequently treated with different gold precursors to obtain early-late heterometallic compounds in which the metal atoms exhibit different intermetallic distances. All compounds were fully investigated by spectroscopic techniques, photoluminescence measurements and single crystal X-ray diffraction. Quantum chemical calculations were also performed. Some compounds show bright emission even at room temperature with quantum yields of up to 19 % (excitation at 350 nm). Furthermore, the reactivity of dimethyl zirconocene derivatives towards gold complexes was investigated, revealing simultaneous ligand exchange and transmetallation reactions.
Angewandte Chemie | 2018
Christoph Schoo; Sebastian Bestgen; Alexander Egeberg; Svetlana V. Klementyeva; Claus Feldmann; Sergey N. Konchenko; Peter W. Roesky
Zintl ions in molecular compounds are of fundamental interest for basic research and application. Two reactive antimony sources are presented that allow direct access to molecular polystibide compounds. These are Sb amalgam (Sb/Hg) and ultrasmall Sb0 nanoparticles (d=6.6±0.8 nm), which were used independently as precursors for the synthesis of the largest f-element polystibide, [(Cp*2 Sm)4 Sb8 ]. Whereas the reaction of the nanoparticles with [Cp*2 Sm] directly led to [(Cp*2 Sm)4 Sb8 ], Sm/Sb/Hg intermediates were isolated when using Sb/Hg as the precursor. These Sm/Sb/Hg intermediates [{(Cp*2 Sm)2 Sb}2 (μ-Hg)] and [{(Cp*2 Sm)3 (μ4 ,η1:2:2:2 -Sb4 )}2 Hg] were synthetically trapped and structurally characterized, giving insight in the formation mechanism of polystibide compounds.
Inorganic Chemistry | 2018
Nicolai D. Knöfel; Caroline Schweigert; Thomas J. Feuerstein; Christoph Schoo; Niklas Reinfandt; Andreas-Neil Unterreiner; Peter W. Roesky
A diphenylphosphine functionalized benzoic acid was applied for the synthesis of a homoleptic dimolybdenum-based metalloligand, exhibiting four symmetrically placed phosphine donor sites. This allowed subsequent treatment with gold(I), rhodium(I), and iridium(I) precursors to obtain early-late heterometallic complexes as well as Lewis acid-base adducts with BH3. The compounds were in-depth investigated by spectroscopic techniques, single-crystal X-ray diffraction, and femtosecond laser spectroscopy. The coordination of different metal fragments to the dimolybdenum metalloligand leads to a fine-tuning of the systems optical properties, which correlates well with fluorescence quantum yield measurements. Nevertheless, triplet dynamics still remain the dominating channel in these systems with an intersystem crossing time constant below 1 ps.
Angewandte Chemie | 2018
Sebastian Bestgen; Christoph Schoo; B. Lilli Neumeier; Thomas J. Feuerstein; Christina Zovko; Ralf Köppe; Claus Feldmann; Peter W. Roesky
The positively charged and weakly polarizable s-block metals commonly do not usually have phosphine ligands in molecular complexes. Herein, we report mono- and dinuclear small diamidophosphine complexes of the alkaline-earth metals Mg, Ca, and Sr, which were prepared from simple precursors and a phosphine-functionalized diamine ligand N,N-bis(2-(diphenyl-phosphino)phenyl)ethane-1,2-diamine (PNHNHP). The alkaline-earth metal based complexes [(PNNP)Mg]2 and [(PNNP)M(thf)3 ] (M=Ca, Sr), exhibit unusual coordination spheres and show bright fluorescence, both in the solid state and in solution. For comparison, the even stronger luminescent Al and Zn complexes [(PNNP)Zn]2 and [(PNNP)AlCl] were prepared. Emission lifetimes in the nanosecond range and high photoluminescence quantum yields up to 93 % are observed at room temperature.
Chemical Communications | 2016
Christoph Schoo; Svetlana V. Klementyeva; Michael T. Gamer; Sergey N. Konchenko; Peter W. Roesky
Chemical Communications | 2018
Christoph Schoo; Sebastian Bestgen; Ralf Köppe; Serygey N. Konchenko; Peter W. Roesky
Chemistry: A European Journal | 2018
Christoph Schoo; Ralf Köppe; Martin Piesch; Michael T. Gamer; Sergey N. Konchenko; Manfred Scheer; Peter W. Roesky
Chemistry: A European Journal | 2018
Christoph Schoo; Ralf Köppe; Martin Piesch; Michael T. Gamer; Sergey N. Konchenko; Manfred Scheer; Peter W. Roesky
Angewandte Chemie | 2018
Sebastian Bestgen; Christoph Schoo; B. Lilli Neumeier; Thomas J. Feuerstein; Christina Zovko; Ralf Köppe; Claus Feldmann; Peter W. Roesky