TY  - JOUR
A1  - Rauch, Florian
A1  - Endres, Peter
A1  - Friedrich, Alexandra
A1  - Sieh, Daniel
A1  - Hähnel, Martin
A1  - Krummenacher, Ivo
A1  - Braunschweig, Holger
A1  - Finze, Maik
A1  - Ji, Lei
A1  - Marder, Todd B.
T1  - An Iterative Divergent Approach to Conjugated Starburst Borane Dendrimers
T2  - Chemistry – A European Journal
N2  - Using a new divergent approach, conjugated triarylborane dendrimers were synthesized up to the 2nd generation. The synthetic strategy consists of three steps: 1) functionalization, via iridium catalyzed C−H borylation; 2) activation, via fluorination of the generated boronate ester with K[HF\(_{2}\)] or [N(nBu\(_{4}\))][HF\(_{2}\)]; and 3) expansion, via reaction of the trifluoroborate salts with aryl Grignard reagents. The concept was also shown to be viable for a convergent approach. All but one of the conjugated borane dendrimers exhibit multiple, distinct and reversible reduction potentials, making them potentially interesting materials for applications in molecular accumulators. Based on their photophysical properties, the 1st generation dendrimers exhibit good conjugation over the whole system. However, the conjugation does not increase further upon expansion to the 2nd generation, but the molar extinction coefficients increase linearly with the number of triarylborane subunits, suggesting a potential application as photonic antennas.
KW  - density functional calculations
KW  - electron storage
KW  - luminescence
KW  - redox
KW  - triarylborane
Y1  - 2020
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/21834
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-218345
VL  - 26
IS  - 57
SP  - 12951
EP  - 12963
ER  -