Beilstein J. Org. Chem.2016,12, 2450–2456, doi:10.3762/bjoc.12.238
; EPR spectroscopy; extended tetrathiafulvalene; protonatedsemiquinone; Introduction
The main idea that led to the creation of the system constructed of two o-quinone terminal moieties bridged with annulated extended tetrathiafulvalene (TTF) insertion, was an attempt to explore acceptor–donor–acceptor
products [4][5][6]. This leads to the fact that the EPR signal related to a protonatedsemiquinone species is often quite weak or even undetectable. In the spectrum, two separate triplet splittings of 2.52 and 1.26 G are attributable to the hyperfine interaction with protons of the central p-phenylene ring
is largely determined by the configuration of the surrounding coordination sites at the termini of the molecule. Thus, (1.)H or (1.)H3, contain a protonatedsemiquinone at the one side and an o-quinone or catechol on the opposite side, respectively. As a result there is a non-symmetric spin-density
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Graphical Abstract
Figure 1:
The structural formula of acceptor–donor–acceptor triad 1.