TY  - JOUR
A1  - Ramler, Jacqueline
A1  - Schwarzmann, Johannes
A1  - Stoy, Andreas
A1  - Lichtenberg, Crispin
T1  - Two Faces of the Bi−O Bond: Photochemically and Thermally Induced Dehydrocoupling for Si−O Bond Formation
JF  - European Journal of Inorganic Chemistry
N2  - The diorgano(bismuth)alcoholate [Bi((C\(_{6}\)H\(_{4}\)CH\(_{2}\))\(_{2}\)S)OPh] (1-OPh) has been synthesized and fully characterized. Stoichiometric reactions, UV/Vis spectroscopy, and (TD-)DFT calculations suggest its susceptibility to homolytic and heterolytic Bi−O bond cleavage under given reaction conditions. Using the dehydrocoupling of silanes with either TEMPO or phenol as model reactions, the catalytic competency of 1-OPh has been investigated (TEMPO=(tetramethyl-piperidin-1-yl)-oxyl). Different reaction pathways can deliberately be addressed by applying photochemical or thermal reaction conditions and by choosing radical or closed-shell substrates (TEMPO vs. phenol). Applied analytical techniques include NMR, UV/Vis, and EPR spectroscopy, mass spectrometry, single-crystal X-ray diffraction analysis, and (TD)-DFT calculations.
KW  - Bismuth
KW  - dehydrocoupling
KW  - radical reactions
KW  - chalcogens
KW  - catalysis
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-257428
VL  - 2022
IS  - 7
ER  - 
TY  - JOUR
A1  - Berger, Sarina M.
A1  - Rühe, Jessica
A1  - Schwarzmann, Johannes
A1  - Phillipps, Alexandra
A1  - Richard, Ann-Katrin
A1  - Ferger, Matthias
A1  - Krummenacher, Ivo
A1  - Tumir, Lidija-Marija
A1  - Ban, Željka
A1  - Crnolatac, Ivo
A1  - Majhen, Dragomira
A1  - Barišić, Ivan
A1  - Piantanida, Ivo
A1  - Schleier, Domenik
A1  - Griesbeck, Stefanie
A1  - Friedrich, Alexandra
A1  - Braunschweig, Holger
A1  - Marder, Todd B.
T1  - Bithiophene-Cored, mono-, bis-, and tris-(Trimethylammonium)-Substituted, bis-Triarylborane Chromophores: Effect of the Number and Position of Charges on Cell Imaging and DNA/RNA Sensing
JF  - Chemistry—A European Journal
N2  - The synthesis, photophysical, and electrochemical properties of selectively mono-, bis- and tris-dimethylamino- and trimethylammonium-substituted bis-triarylborane bithiophene chromophores are presented along with the water solubility and singlet oxygen sensitizing efficiency of the cationic compounds Cat\(^{1+}\), Cat\(^{2+}\), Cat(i)\(^{2+}\), and Cat\(^{3+}\). Comparison with the mono-triarylboranes reveals the large influence of the bridging unit on the properties of the bis-triarylboranes, especially those of the cationic compounds. Based on these preliminary investigations, the interactions of Cat\(^{1+}\), Cat\(^{2+}\), Cat(i)\(^{2+}\), and Cat\(^{3+}\) with DNA, RNA, and DNApore were investigated in buffered solutions. The same compounds were investigated for their ability to enter and localize within organelles of human lung carcinoma (A549) and normal lung (WI38) cells showing that not only the number of charges but also their distribution over the chromophore influences interactions and staining properties.
KW  - singlet oxygen
KW  - boron
KW  - bioimaging
KW  - luminescence
KW  - nucleic acid
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-256963
VL  - 27
IS  - 56
ER  -