Oligo , donor-acceptor

In the context of oligo-fluorene (oFL) molecular wires, we will conclude with an outlook that focuses on donor-acceptor conjugates bearing Ceo electron-accepting units and zinc porphyrin (ZnP) or ferrocene (Fc) electron-donating moieties, respectively. Both, the donor and acceptor are covalently connected by oFL bridges of variable length. 

Oligo-Phenylene Vinylene A Model System for Donor—Acceptor Interactions... 

Fig. 25 The series of dyads, 29(n), possessing the oligo-p-phenylenevinylene bridge that were used to investigate the switchover from superexchange characteristics to molecular wire behaviour in the photoinduced electron transfer reaction, from the locally excited state of tetracene (TET) donor to the pyromellitimide (PI) acceptor.148 Also, shown are a schematic of the photoinduced charge separation rate versus, donor-acceptor distance (lower left-hand side) and the LUMO energies of TET and the various bridges (lower right-hand side).

Ramakrishnan reported donor-acceptor polymers that contain three folding elements alternating aromatic donors and acceptors, linked by oligo(oxyethylene) groups [43]. Folding was driven by the solvophobic effect, or by alkali-metal ion complexation, and characterized by the upfield shift of the NMR signals of aromatic protons shifts or by substantial changes in the UV-Vis spectra. 

Neuteboom EE, Meskers SCJ, Van Hal PA, Van Duien JKJ, Meijer EW, Janssen RAJ, Dupin H, Pourtois G, Comil J, Lazzaroni R, Bredas J-L, Beljonne D (2003) Alternating oligo(p-phenylene vinylene)-perylene bisimide copolymers synthesis, photophysics, and photovoltaic properties of a new class of donor-acceptor materials. J Am Chem Soc 125 8625... 

DAOPE Oligo(phenyleneethynylene) with terminal donor-acceptor substitu-... 

Furthermore, we extend the system to a more realistic nanowire complex shown below in which the polyacetylene of above example was replaced by head-to-tail coupled polythiophene derivatives—[oligo(2,5-thienylene-ethynylene)-](OTE)-terminated by the same fullerene and H2TPP. The OTE wire part is a class of conjugated oligomers with a high shape-persistence as rigid rods and special attention is focused on the systems with terminal donor-acceptor substitution because of a strong push-pull effect [57-59]. 

---