Alignment behaviour of symmetrical and asymmetrical triphenylenes possessing fluoroalkylated side chains on modified substrates

Terasawa, Naohiro; Monobe, Hirosato

doi:10.1080/02678290701211520

Cited by 10 publications

(11 citation statements)

References 23 publications

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“…In general, the fluoroalkyl-terminated bromides and azides seemed to form larger domains than their alkyl-terminated analogues and also a stronger homeotropic orientation towards the glass slides. [30][31][32] The final compounds TTT-3,4,5 and F-TTT-3,4 were liquid crystalline in nature; however TTT-6 and F-TTT-5,6 were not. Figure 3 shows the textures of some of these compounds.…”

Section: Polarising Optical Microscopy (Pom)mentioning

confidence: 97%

“…We and others [30][31][32] recently investigated hexaalkoxytriphenylenes (HATs) containing partially fluorinated tails and found that these compounds have a strong tendency for homeotropic alignment on a variety of substrates. Therefore, we also investigated the liquid crystalline ordering of compounds with a TTT core and three pendant triphenylenes substituted with five fluorine-containing tails (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Columnar ordering properties of fluorinated and non-fluorinated tris(hexaalkoxytriphenylene)tristriazolotriazines

2015

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Two new series of columnar discotic liquid crystalline materials based on a tristriazolotriazine (TTT) core connected to three pendant hexyloxytriphenylene or pentafluoropentyloxytriphenylene groups via a flexible alkyl spacer are synthesised and investigated. It is found that the mesophase stability is very much dependent on the spacer length. For a short spacer length (propyl or butyl), Col h phases are found in which the disc-like moieties are randomly mixed in the columns. For one compound with a pentyl spacer and pentafluoropentyloxy tails on the triphenylene groups, a Col ob phase is found in which the columns of triphenylenes and TTT moieties are separated. When the spacer is longer (hexyl), the liquid crystallinity is lost. The compounds with pentafluoropentyloxy tails on the triphenylene units have a higher thermal stability than those with hexyloxy tails.

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Section: Polarising Optical Microscopy (Pom)mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Columnar ordering properties of fluorinated and non-fluorinated tris(hexaalkoxytriphenylene)tristriazolotriazines

2015

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“…Nevertheless, the obtained results agree with the assignment of their POM textures and also with the literature on fluoroalkoxy HATs. [26,[45][46][47] The d-spacings for compounds 4b-n and 5b-n are given in Table 1. For all compounds 4b-n and 5b-n the d-spacing is approximately the same (about 17.0 Å) irrespective of the spacer length or the nature of the end-group (bromide or azide) that was used.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…In this paper we wish to report on some related systems in which the triphenylenes contain four or five fluorinated tails ( Figure 1). We and others [26,[45][46][47] recently investigated HATs containing partially fluorinated tails and found that these compounds have a strong tendency for homeotropic alignment on a variety of substrates. In addition, we also found that the number of fluorine tails influences the stability of the columnar ordering.…”

Section: Introductionmentioning

confidence: 99%

“…An interesting property of triphenylenes containing fluoroalkoxy tails is that they exhibit a stronger tendency towards homeotrophic alignments on various surfaces. [45][46][47] This may be an important property for applications in thin-film electronics, like in solar cells, where a good surface ordering and stacking of columns perpendicular on the electrodes is desired.…”

Section: Introductionmentioning

confidence: 99%

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Ordering properties of columnar discotic triazines containing three pendant triphenylenes with four or five fluorinated tails

2015

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Two series of discotic columnar liquid crystals were prepared and investigated, consisting of a triazine core to which three triphenylenes (HATs) are attached, connected via a flexible variable spacer containing a triazole group. The triphenylenes have five pentafluoropentyloxy tails or four pentafluoropentyloxy tails and one methoxy group. The compounds with four fluorinated tails on the HAT groups show a lamellar-columnar phase (Col lam ), whereas a compound with five fluorinated tails on the HAT groups shows a hexagonal-columnar (Col h ) phase. Small differences in the steric properties and fluorophobic effects can therefore have a strong influence on the ordering of the molecules in the liquid crystalline phase.

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Conjugated Triphenylene Polymers for Blue OLED Devices

Saleh

Baumgarten

Kim

et al. 2009

Macromol. Rapid Commun.

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Three polytriphenylene derivatives with phenyl and alkyl groups as side chains have been tested as blue light emitters. The best performance in terms of turn-on voltage and luminance efficiencies was obtained for poly(2-heptyl-3-(4-octylphenyl)-1,4-diphenyl-6,11-triphenylenyl-1,4-benzene) (1), which was additionally blended with an electron-transporting and a hole-injection material in the device, and had an onset of 4.6 V and reached 0.73 cd · A(-1) .

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Alignment behaviour of symmetrical and asymmetrical triphenylenes possessing fluoroalkylated side chains on modified substrates

Cited by 10 publications

References 23 publications

Columnar ordering properties of fluorinated and non-fluorinated tris(hexaalkoxytriphenylene)tristriazolotriazines

Columnar ordering properties of fluorinated and non-fluorinated tris(hexaalkoxytriphenylene)tristriazolotriazines

Ordering properties of columnar discotic triazines containing three pendant triphenylenes with four or five fluorinated tails

Conjugated Triphenylene Polymers for Blue OLED Devices

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