Charge carrier transport in perylene-based and pyrene-based columnar liquid crystals

• Alessandro L. Alves,
• Simone V. Bernardino,
• Carlos H. Stadtlober,
• Edivandro Girotto,
• Giliandro Farias,
• Rodney M. do Nascimento,
• Sergio F. Curcio,
• Thiago Cazati,
• Marta E. R. Dotto,
• Juliana Eccher,
• Leonardo N. Furini,
• Hugo Gallardo,
• Harald Bock and
• Ivan H. Bechtold

Beilstein J. Org. Chem. 2023, 19, 1755–1765, doi:10.3762/bjoc.19.128

• ; columnar liquid crystal; organic electronics; perylene; pyrene; Introduction Conjugated organic molecules have been widely investigated due to their interesting transport properties and promising applications as active layer in organic photovoltaics (OPVs), organic field effect transistors (OFETs

• the charge carrier mobility (parallel vs perpendicular to the columnar axis) of up to ten orders of magnitude [3][4][5][6][7]. In 1994, Adam and collaborators obtained a hole-mobility of up to 0.1 cm2 V−1 s−1 for a triphenylene-based columnar liquid crystal [8], motivating intense research activity to

• from strong π–π interactions [7][21][22][23][24]. In this work, we investigated a perylene and a pyrene-based columnar liquid crystal in hole-only and electron-only devices to compare their charge carriying properties. The molecular organization and photophysical performances are coherent with the

Amphiphilic dendritic peptides: Synthesis and behavior as an organogelator and liquid crystal

• Baoxiang Gao,
• Hongxia Li,
• Defang Xia,
• Sufang Sun and
• Xinwu Ba

Beilstein J. Org. Chem. 2011, 7, 198–203, doi:10.3762/bjoc.7.26

• experiments. Amphiphilic dendritic peptides G3 show good organogel properties with a minimum gelation concentration as low as 1 wt %. Furthermore, amphiphilic dendritic peptides G3 can form a hexagonal columnar liquid crystal assembly over a wide temperature range. Keywords: amphiphilic; dendritic peptides

• characteristic of hexagonal columnar liquid crystals. The conic fan-shaped textures of G3 grow (Figure 6B), and no longer change at 50 °C (Figure 6C). Figure 7 shows the XRD scan for the birefringent phase of G3 at 50 °C. The birefringent phases of G3 were further confirmed as a hexagonal columnar liquid crystal