Aromatic π–π driven supergelation, aggregation induced emission and columnar self-assembly of star-shaped 1,2,4-oxadiazole derivatives

Abstract

Effect of the number of flexible peripheral tails on the self-assembly of star-shaped molecules.

Hexacatenars Exhibiting π-π Driven Supergelation, Aggregation Induced Blue Light Emission and Thermochromism

“…Similarly m ‐substituted hexacatenars exhibited single absorption maximum centered at 268 nm, while the tetracatenar 2a exhibited an absorption maximum centered at 265 nm with a broad shoulder at 290 nm (Figure a, Table ). It should be noted that in the case of star shaped 1,2,4‐oxadiazole derivatives only single band was observed at 278 nm . m ‐substituted compounds exhibited blue shifted absorption maximum in comparison to p ‐substituted compounds.…”

“…Cyclic Voltammograms showed that these molecules exhibit comparable HOMO, LUMO values irrespective of the position of the substitution to the central benzene ring (HOMO: −6.04 to −6.12 eV; LUMO: −2.21 to −2.31 eV). In comparison to the star shaped derivatives these molecules exhibit higher HOMO and lower LUMO levels (HOMO: −6.17 to −6.31 eV; LUMO: −1.96 to −2.09 eV) . Though the band gaps of these compounds are high (E g,opt =3.87‐3.89 eV), they were found to be lower than the band gaps of the corresponding star shaped molecules (E g,opt ≈ 4.22 eV) .…”

“…In comparison to the star shaped derivatives these molecules exhibit higher HOMO and lower LUMO levels (HOMO: −6.17 to −6.31 eV; LUMO: −1.96 to −2.09 eV) . Though the band gaps of these compounds are high (E g,opt =3.87‐3.89 eV), they were found to be lower than the band gaps of the corresponding star shaped molecules (E g,opt ≈ 4.22 eV) . The higher band gap is the most challenging material property pursued in the advancement of deep blue PHOLEDs.…”

An overview on synthetic strategies for the construction of star-shaped molecules

“…In 1948, Schaefgen and Flory reported formation of mesophases of interesting mesomorphic and photophysical properties. [18][19][20][21][22][23][24][25][26][27][28][29][30][31] The applications of starshaped molecules as building units for dendrimers 32,33 as well as in supramolecular host-guest chemistry have been also reported. 34,35 Moreover, the interesting biological activities of some diverse multivalent scaffolds adamantane have been recently investigated.…”

Modeling of Known and New Star-Shaped Derivatives of Tristriazolotriasine and Prediction of their Columnar Mesomorphism

“…Такие материалы являются ключевыми при создании новых электронных и оптоэлектронных устройств. Так, соединения на основе 1,3,4-оксадиазола и тристриазолотриазинов находят широкое применение при разработке электронно-транспортных/дырочно-блокирующих материалов, которые служат светоизлучателями в электролюминесцентных диодах [7][8][9][10].…”