Formation of hexagonal columnar phases by heterocyclic pyrimidine derivatives

Lin, Yang; Lai, Chung K.; Chang, Yun-Tzu; Liu, Kwang Ting

doi:10.1080/02678290110097800

Cited by 37 publications

(7 citation statements)

References 9 publications

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“…The ratio of C 3 -, C 2 -or non-symmetric target molecules can be controlled to a certain extent by the type and the ratio of starting materials. [28,32] However, the purification is very difficult or even impossible for mesogens with flexible chains in the periphery, unless the chemical and physical properties of the arms differentiate sufficiently.…”

Section: Synthesismentioning

confidence: 99%

“…Strategy B can be employed if the arms contain functional groups suitable to form the core unit and when the scaffold is sufficiently stable under the reaction conditions. [26,28] Thus, the core is produced in the final step by trimerisation. A divergent synthesis (Strategy C) can be performed when the arms are built stepwise around the core; [29] however, yields and purity might be low if the transformations are not quantitative in each step.…”

Section: Synthesismentioning

confidence: 99%

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Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Lehmann

2009

Chemistry A European J

105

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This concept article focuses on the simplest branched liquid crystalline (LC) molecules--the three-armed mesogens with arms symmetrically linked to the core. They are basic but fascinating mesogens for the exploration of self-assembling processes into complex, functional, soft materials. Quite a large number of elements of diversity provide the possibility to synthetically program such star-shaped molecules and to control phase formation, if aggregation processes are fully understood. Recently, ABC-cores opened the way to non-symmetric mesogens and, therefore, to the concept of multifunctional materials with defined nanostructures. In the article this outstanding family of mesogens is classified, their peculiar molecular structure and self-assembly are discussed and potential applications are presented, in which this type of mesogen may be beneficial.

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Section: Synthesismentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Lehmann

2009

Chemistry A European J

105

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“…The first method consists in the construction of the pyrimidine ring by condensation reactions [ 256 , 257 , 258 ], the second involves the functionalization of the pyrimidine ring. Trifluoromethanesulfonic anhydride appeared to be suitable for a co-condensation of benzonitriles with acetophenones yielding 2,4,6-triphenylpyrimidines 84 substituted with alkoxy side chains [ 259 ].…”

Section: Compounds With Heterocyclic Coresmentioning

confidence: 99%

Star-Shaped Conjugated Systems

2010

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The present review deals with the preparation and the properties of star-shaped conjugated compounds. Three, four or six conjugated arms are attached to cross-conjugated cores, which consist of single atoms (B, C+, N), benzene or azine rings or polycyclic ring systems, as for example triphenylene or tristriazolotriazine. Many of these shape-persistent [n]star compounds tend to π-stacking and self-organization, and exhibit interesting properties in materials science: Linear and non-linear optics, electrical conductivity, electroluminescence, formation of liquid crystalline phases, etc.

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“…Compounds 2, 6a-d and 10 were synthesised according to procedures described in the literature [31,36].…”

Section: Methodsmentioning

confidence: 99%

New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

2016

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In this study, eight new compounds derived from thiophene were synthesised and characterised. The four symmetrical compounds contain two heterocyclic 1,2,4-oxadiazole on each side of the 2,5-disubstituted thiophene, and the four non-symmetrical compounds contain alkyne groups as a spacer replacing one of these heterocycles. Some of the compounds presented liquid crystalline properties with smectic and nematic mesophases. The non-symmetrical compounds presented low emission of blue light. ARTICLE HISTORY

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Formation of hexagonal columnar phases by heterocyclic pyrimidine derivatives

Cited by 37 publications

References 9 publications

Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Star-Shaped Conjugated Systems

New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

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