Liquid crystals in the series of 2,4,6-tristyryl-1,3,5-triazines

Holst, Hans Christof; Pakuła, Tadeusz; Meier, Herbert

doi:10.1016/j.tet.2004.06.031

Cited by 61 publications

(40 citation statements)

References 17 publications

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“…Während hexaalkyliertes Hexa-peri-hexabenzocoronen (HBC-C 10,6 , 1; Abbildung 2) ein Elektronendonor ist, handelt es sich bei den eingesetzten Perylendiimid(PDI)- [10] Die geschichtete Verteilung der Reflexe in der meridionalen Richtung des 2D-WWRD-Musters in Abbildung 3 c wurde mithilfe der Millerschen Indizes (hkl) bezeichnet und der entsprechenden intrakolumnaren Packung zugeordnet. [11] Die Generell gilt, dass HBCs mit sterisch nicht anspruchsvollen Alkyl-Substituenten sich homöotrop auf einer Substratoberfläche anordnen, sobald sie aus der isotropen Schmelze auskristallisieren. [15] Bei stark reduzierten pWechselwirkungen zwischen den aromatischen Kernen, wie das in der isotropen Phase der Fall ist, richten sich die Moleküle homöotrop aus.…”

Section: Im Gedenken An Tadeusz Pakulaunclassified

Ausgeprägte supramolekulare Ordnung in diskotischen Donor‐Acceptor‐Mischungen

et al. 2006

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Durch Mischen eines Hexa‐peri‐hexabenzocoronen(HBC)‐Derivats mit einem Perylen‐ oder Terrylendiimid entstehen komplexe helicale Anordnungen in den kolumnaren Überstrukturen. Wegen der schwachen Donor‐Acceptor‐Wechselwirkungen zwischen dem elektronenreichen HBC und den elektronenarmen Rylen‐Farbstoffen bilden sich streng alternierende, weitreichend geordnete Kolumnen. Die Mischungen zeigen eine homöotrope Orientierung auf Oberflächen (Beispiel siehe Bild).

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Section: Im Gedenken An Tadeusz Pakulaunclassified

Ausgeprägte supramolekulare Ordnung in diskotischen Donor‐Acceptor‐Mischungen

et al. 2006

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“…High-loading resins functionalized with 1,3,5-triazine dendrimers can be used as scavenger resins for combinatorial chemistry [496,497]. 1,3,5-Triazines have been used to form new classes of star-shaped discotic liquid crystals (LC) for potential nonlinear optical applications [498][499][500][501][502]. Substituted 1,3,5-triazines have been used as chiral solvating agents for chiral discrimination [503][504][505][506].…”

Section: Relevant Natural and Useful Compoundsmentioning

confidence: 99%

Six‐Membered Heterocycles: Triazines, Tetrazines and Other Polyaza Systems

Oliva¹,

Laza²,

Ocáriz³

2011

Modern Heterocyclic Chemistry

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“…Evidence for the E-shaped conformers was obtained from the discovery of a helical crystal phase, formed from the monotropic hexagonal mesophase upon annealing at ambient temperature [62][63][64]. Helical mesophases were recently found for similar compounds: in the series of stilbenoid derivatives [28,29], cyclotriphosphazenes [43,44] and in wedge-shaped molecules [11,12]. Such a packing seems to be rather general when space-filling and nano-segregation needs to be balanced in thermotropic liquid crystal phases [57].…”

Section: Columnar Liquid Crystals From Star-shaped Mesogensmentioning

confidence: 99%

Polymorphism in liquid crystals from star-shaped mesogens

Gemming¹,

Popov²,

Lehmann³

2007

Philosophical Magazine Letters

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Star-shaped molecules, based on a phloroglucinol core with three oligobenzoate arms, are powerful mesogens that can be combined to columnar liquid crystalline materials and soft organic crystals. The structural properties of such modern materials exhibit polymorphism at two different length scales. On the molecular level, the mesogens are highly flexible molecules with a large variety of almost isoenergetic conformers of varying propensity towards regular stacking in the bulk phase. On the supramolecular level, polymorphic structures occur, which comprise different liquid crystalline phases with anisotropic columnar order and soft crystals with a more isotropic three-dimensional ordering. For the smallest mesogen, the present results are evidence that the two forms of polymorphism are linked. Columnar liquid crystals are formed from a low-symmetry, folded conformer, which already accounts for the nano-segregation of the planar aromatic centre and the flexible aliphatic chain parts of the mesogen, whereas the soft, more isotropic crystals are grown from the C 3 -symmetric, star-shaped conformer of a derivative with shorter alkyl chains. Molecular dynamics simulations confirm the stability of each structure at room temperature.

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Liquid crystals in the series of 2,4,6-tristyryl-1,3,5-triazines

Cited by 61 publications

References 17 publications

Ausgeprägte supramolekulare Ordnung in diskotischen Donor‐Acceptor‐Mischungen

Ausgeprägte supramolekulare Ordnung in diskotischen Donor‐Acceptor‐Mischungen

Six‐Membered Heterocycles: Triazines, Tetrazines and Other Polyaza Systems

Polymorphism in liquid crystals from star-shaped mesogens

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