Imidazole-annulated tetrathiafulvalenes exhibiting pH-tuneable intramolecular charge transfer and redox properties.
In order to study the electronic interactions in donor-acceptor ensembles as a function of pH, an efficient synthetic route to three imidazole-annulated tetrathiafulvalene (TTF) derivatives 1-3 is reported. Their electronic absorption spectra, in view of photoinduced intramolecular charge transfer, and their electrochemical behavior were investigated, and pK(a) values for the two protonation processes on the acceptor unit were determined in organic solvents by photometric titration. The influence of the TTF moiety on these values is discussed.
Wu
Jincai
J
Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
Dupont
Nathalie
N
Liu
Shi-Xia
SX
Neels
Antonia
A
Hauser
Andreas
A
Decurtins
Silvio
S