Star-shaped and linear π-conjugated oligomers consisting of a tetrathienoanthracene core and multiple diketopyrrolopyrrole arms for organic solar cells

• Hideaki Komiyama,
• Chihaya Adachi and
• Takuma Yasuda

Beilstein J. Org. Chem. 2016, 12, 1459–1466, doi:10.3762/bjoc.12.142

• (40–60 nm). Keywords: bulk heterojunction; diketopyrrolopyrrole; organic solar cells; star-shaped oligomers; tetrathienoanthracene; Introduction Solution-processable organic semiconductors have been intensively studied as key materials for low-cost, flexible, and large-area optoelectronic devices

Star-shaped tetrathiafulvalene oligomers towards the construction of conducting supramolecular assembly

• Masahiko Iyoda and
• Masashi Hasegawa

Beilstein J. Org. Chem. 2015, 11, 1596–1613, doi:10.3762/bjoc.11.175

• single crystals was σrt = 1.8 × 10−2 S cm−1 and the fiber was 1.9 × 10−2 S cm−1, whereas the amorphous film was 2.5 × 10−3 S cm−1. The difference in the conductivity reflects the molecular level alignments. Other star-shaped oligomers 39–44 also formed nanostructures fibers, particles and film, and

Incorporation of perfluorohexyl-functionalised thiophenes into oligofluorene-truxenes: synthesis and physical properties

• Neil Thomson,
• Alexander L. Kanibolotsky,
• Joseph Cameron,
• Tell Tuttle,
• Neil J. Findlay and
• Peter J. Skabara

Beilstein J. Org. Chem. 2013, 9, 1243–1251, doi:10.3762/bjoc.9.141

• ; star-shaped molecules; synthesis; truxene; Introduction Star-shaped oligomers share a common central unit with multiple arms branching from the core [1]. The morphology and electronic properties of these oligomers often vary from the linear versions of the arms alone. 10,15-Dihydro-5H-diindeno[1,2-a;1

• examples of unsaturated alkyl [7] and phenyl [8] substituents at these positions. Cross-coupling reactions at the C2, C7 and C12 positions is the usual method of attaching “arms” to the core to form the star-shaped oligomers, such as T1 and T4 (Figure 1), extending the conjugation length and altering the

• conjugation of the molecule in T1-4FTh compared to T1-3FTh. This reaffirms that the thiophene unit of T1-3FTh is too twisted to contribute significantly to the conjugation of the molecule. Conclusion In conclusion we have presented three new star-shaped oligomers, namely T1-3FTh, T1-4FTh, and T4-4FTh. For the