Charge-Gating Dibenzothiophene-S,S-dioxide Bridges in Electron Donor–Bridge–Acceptor Conjugates

Published on Jun 19, 2017in Journal of Physical Chemistry C4.126
· DOI :10.1021/ACS.JPCC.7B03889
Gilles Yzambart6
Estimated H-index: 6
 (Durham University), Anna Zieleniewska7
Estimated H-index: 7
 (FAU: University of Erlangen-Nuremberg)+ 3 AuthorsDirk M. Guldi111
Estimated H-index: 111
 (FAU: University of Erlangen-Nuremberg)
Sources
Abstract
The synthesis of a series of new electron donor–bridge–acceptor (D–B–A) conjugates (18–20) comprising electron-donating zinc(II) porphyrins (ZnPs) and electron-accepting fullerenes (C60s) connected through various co-oligomer bridges containing both dibenzothiophene-S,S-dioxide and fluorene units is reported. Detailed investigations using cyclic voltammetry, absorption, fluorescence, and femto/nanosecond transient absorption spectroscopy in combination with quantum chemical calculations have enabled us to develop a detailed mechanistic view of the charge-transfer processes that follow photoexcitation of ZnP, the bridge, or C60. Variations in the dynamics of charge separation, charge recombination, and charge-transfer gating are primarily consequences of the electronic properties of the co-oligomer bridges, including their electron affinity and the energy levels of the excited states. In particular, placing one dibenzothiophene-S,S-dioxide building block at the center of the molecular bridge flanked by two...
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