Synthesis and characterization of mesogenic triphenylene-perylene dyads with phenoxy-alkoxy linkers

Kong, Xiangfei; Dai, Shengping; Wang, Guixia; Zhang, Zhouyang; Zhang, Laiqi; Liao, Peihai; Liu, Wenting

doi:10.1080/15421406.2017.1328218

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…In this subsection, the last developments regarding the synthesis of novel discotic mesogenic materials will be described. Triphenylene derivatives still remain the most studied compounds and they have been used to develop new materials, testing new side chains, or new cores [ 191 , 192 , 193 , 194 , 195 , 196 ], to be linked with other cores to prepare dyads and triads [ 67 , 197 , 198 , 199 , 200 ] or materials giving segregate columns [ 201 , 202 ]. Triphenylenes were also doped with nanoparticles or used to prepare blends with other mesogenic molecules [ 203 , 204 , 205 ].…”

Section: Recent Advances In the Study Of Discotic Liquid Crystalsmentioning

confidence: 99%

“…Triphenylene was also used as a constituent of dyads and triads, often in molecular system in which an electron donor (D) is covalently linked to an electron acceptor (A), with the aim of obtaining a “molecular heterojunction” [ 168 , 197 , 198 , 200 , 206 , 207 ]. This kind of molecular system can be a good candidate to produce optoelectronic devices, such as organic light-emitting diodes (OLED) and organic solar cells (OSC).…”

Section: Recent Advances In the Study Of Discotic Liquid Crystalsmentioning

confidence: 99%

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Charge Mobility in Discotic Liquid Crystals

Termine

Golemme

2021

IJMS

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Discotic (disk-shaped) molecules or molecular aggregates may form, within a certain temperature range, partially ordered phases, known as discotic liquid crystals, which have been extensively studied in the recent past. On the one hand, this interest was prompted by the fact that they represent models for testing energy and charge transport theories in organic materials. However, their long-range self-assembling properties, potential low cost, ease of processability with a variety of solvents and the relative ease of tailoring their properties via chemical synthesis, drove the attention of researchers also towards the exploitation of their semiconducting properties in organic electronic devices. This review covers recent research on the charge transport properties of discotic mesophases, starting with an introduction to their phase structure, followed by an overview of the models used to describe charge mobility in organic substances in general and in these systems in particular, and by the description of the techniques most commonly used to measure their charge mobility. The reader already familiar or not interested in such details can easily skip these sections and refer to the core section of this work, focusing on the most recent and significant results regarding charge mobility in discotic liquid crystals.

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Section: Recent Advances In the Study Of Discotic Liquid Crystalsmentioning

confidence: 99%

Section: Recent Advances In the Study Of Discotic Liquid Crystalsmentioning

confidence: 99%

Charge Mobility in Discotic Liquid Crystals

Termine

Golemme

2021

IJMS

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“…Some D-A DLCs yield dual pathways along molecular columns to transfer electrons and holes [34,35]. At present, the discogens used in these D-A DLCs are limited in triphenylene, anthraquinone, perylene and BODIPY derivatives [36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Mesogenic complementary absorbing dyads based on porphyrin and perylene units

Kong

Gong

Dai

et al. 2018

J. Porphyrins Phthalocyanines

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Five novel dyads, consisting of a tetraphenylporphyrine unit connected to a perylene monoimide diester unit via a flexible bridge -CONH-(CH 2 ) n -(n = 4, 6, 8, 10 and 12), have been synthesized. Their structures were characterized by 13 C and 1 H nuclear magnetic resonance spectroscopy, infrared spectroscopy, mass spectrometry and elemental analysis. The UV-vis absorption spectra revealed these dyads have broad optical absorption in the ultraviolet and visible regions due to the complementary absorption of the two units. The differential scanning calorimetry traces and polarized optical microscopy textures showed all these dyads have columnar liquid crystal phases. Cyclic voltammetry revealed the highest occupied molecular orbitals of the dyads located on the porphyrin units, and the lowest unoccupied molecular orbitals located on the perylene units. In addition, these results were in agreement with that of the theoretical modeling. When excited at 423 or 473 nm, the photoluminescent emission spectra showed that the degree of fluorescence quenching of porphyrin units increased as the spacers became shorter. This quenching was ascribed to intramolecular photoinduced electron transfer, which also induced the dyad molecules to form the charge-separated states. The charge-separated molecules were further confirmed by the photocurrent response curves. These behaviors of broad absorption of the ultraviolet-visible light, yielding the charge-separated states of the molecules when excited and the formation of columnar liquid crystal phase made these dyads candidates for single-component photovoltaic active materials.

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