TY  - JOUR
A1  - Griesbeck, Stefanie
A1  - Michail, Evripidis
A1  - Rauch, Florian
A1  - Ogasawara, Hiroaki
A1  - Wang, Chenguang
A1  - Sato, Yoshikatsu
A1  - Edkins, Robert M.
A1  - Zhang, Zuolun
A1  - Taki, Masayasu
A1  - Lambert, Christoph
A1  - Yamaguchi, Shigehiro
A1  - Marder, Todd B.
T1  - The Effect of Branching on the One‐ and Two‐Photon Absorption, Cell Viability, and Localization of Cationic Triarylborane Chromophores with Dipolar versus Octupolar Charge Distributions for Cellular Imaging
JF  - Chemistry – A European Journal
N2  - Two different chromophores, namely a dipolar and an octupolar system, were prepared and their linear and nonlinear optical properties as well as their bioimaging capabilities were compared. Both contain triphenylamine as the donor and a triarylborane as the acceptor, the latter modified with cationic trimethylammonio groups to provide solubility in aqueous media. The octupolar system exhibits a much higher two‐photon brightness, and also better cell viability and enhanced selectivity for lysosomes compared with the dipolar chromophore. Furthermore, both dyes were applied in two‐photon excited fluorescence (TPEF) live‐cell imaging.
KW  - boranes
KW  - cell imaging
KW  - fluorescence
KW  - lysosome
KW  - two-photon excited fluorescence
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-212887
VL  - 25
IS  - 57
SP  - 13164
EP  - 13175
ER  - 
TY  - JOUR
A1  - Griesbeck, Stefanie
A1  - Michail, Evripidis
A1  - Rauch, Florian
A1  - Ogasawara, Hiroaki
A1  - Wang, Chenguang
A1  - Sato, Yoshikatsu
A1  - Edkins, Robert M.
A1  - Zhang, Zuolun
A1  - Taki, Masayasu
A1  - Lambert, Christoph
A1  - Yamaguchi, Shigehiro
A1  - Marder, Todd  B.
T1  - The Effect of Branching on One- and Two-Photon Absorption, Cell Viability and Localization of Cationic Triarylborane Chromophores with Dipolar versus Octupolar Charge Distributions for Cellular Imaging
JF  - Chemistry - A European Journal
N2  - Two different chromophores, namely a dipolar and an octupolar system, were prepared and their linear and nonlinear optical properties as well as their bioimaging capabilities were compared. Both contain triphenylamine as the donor and a triarylborane as the acceptor, the latter modified with cationic trimethylammonio groups to provide solubility in aqueous media. The octupolar system exhibits a much higher two‐photon brightness, and also better cell viability and enhanced selectivity for lysosomes compared with the dipolar chromophore. Furthermore, both dyes were applied in two‐photon excited fluorescence (TPEF) live‐cell imaging.
KW  - boranes
KW  - cell imaging
KW  - fluerescence
KW  - lysosome
KW  - two-photon excited fluorescence
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-204829
VL  - 25
IS  - 57
ER  - 
TY  - JOUR
A1  - Belaidi, Houmam
A1  - Rauch, Florian
A1  - Zhang, Zuolun
A1  - Latouche, Camille
A1  - Boucekkine, Abdou
A1  - Marder, Todd B.
A1  - Halet, Jean-Francois
T1  - Insights into the optical properties of triarylboranes with strongly electron-accepting bis(fluoromesityl)boryl groups: when theory meets experiment
JF  - ChemPhotoChem
N2  - The photophysical properties (absorption, fluorescence and phosphorescence) of a series of triarylboranes of the form 4-D-C\(_6\)H\(_4\)-B(Ar)\(_2\) (D=\(^t\)Bu or NPh\(_2\); Ar=mesityl (Mes) or 2,4,6-tris(trifluoromethylphenyl (Fmes)) were analyzed theoretically using state-of-the-art DFT and TD-DFT methods. Simulated emission spectra and computed decay rate constants are in very good agreement with the experimental data. Unrestricted electronic computations including vibronic contributions explain the unusual optical behavior of 4-\(^t\)Bu-C\(_6\)H\(_4\)-B(Fmes)\(_2\) 2, which shows both fluorescence and phosphorescence at nearly identical energies (at 77 K in a frozen glass). Analysis of the main normal modes responsible for the phosphorescence vibrational fine structure indicates that the bulky tert-butyl group tethered to the phenyl ring is strongly involved. Interestingly, in THF solvent, the computed energies of the singlet and triplet excited states are very similar for compound 2 only, which may explain why 2 shows phosphorescence in contrast to the other members of the series.
KW  - boron
KW  - density functional calculations
KW  - luminescence
KW  - phosphorescence
KW  - photophysics
KW  - activated delayes flourescence
KW  - 3-coordinate organoboron compounds
KW  - light-emitting-diodes
KW  - phosphorescene spectra
KW  - molecular structures
KW  - high efficiency
KW  - pi-conjugation
KW  - trivalent boron
KW  - single photon
KW  - donor
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-205600
VL  - 4
IS  - 3
ER  -