199531-82-3Relevant academic research and scientific papers
Aromatic π-π Driven supergelation, aggregation induced emission and columnar self-assembly of star-shaped 1,2,4-oxadiazole derivatives
Pathak, Suraj Kumar,Pradhan, Balaram,Gupta, Ravindra Kumar,Gupta, Monika,Pal, Santanu Kumar,Achalkumar, Ammathnadu S.
, p. 6546 - 6561 (2016)
A new family of star shaped 1,2,4-oxadiazole derivatives with the variation in the number of flexible peripheral tails have been synthesized and characterized. It is interesting to note that the number of flexible tails at the periphery dictated the self-
Highly luminescent liquid crystals by connecting 1,3,4-oxadiazole with thiazolo[5,4-d]thiazole units
Bechtold, Ivan H.,Cazati, Thiago,Curcio, Sergio F.,Eccher, Juliana,Falc?o, Eduardo H. L.,Farias, Giliandro,Gallardo, Hugo,Girotto, Edivandro,Malvestiti, Ivani,Manfredi, Alex M.,Salla, Cristian A. M.,Santos, Arthur B. S.,Westphal, Eduard
, (2020/12/17)
The direct bonding between a thiazolo[5,4-d]thiazole and two 1,3,4-oxadiazole units allowed us to create a new and versatile rigid core for luminescent liquid crystal, which showed interesting and variable mesomorphic and photophysical properties. From the 5-bis(5-phenyl-1,3,4-oxadiazol-2-yl)thiazolo[5,4-d]thiazole new core, three molecules with different number of alkoxy chains were synthesized and had their properties correlated with the molecular structure. The molecule with two chains showed a smectic C mesophase, while the mesogens with four and six chains presented hexagonal columnar mesomorphism, which was confirmed by POM and XRD measurements. In addition, the molecule with six chains presented liquid crystalline behavior close to room temperature. In solution, the molecules presented strong photoluminescence ranging from blue to yellow, with quantum yields higher than 0.6. Excited state lifetimes allowed to correlate the fluorescence component associated to the different emitting species to the molecular organization in spin coated films. The molecular energy levels, together with thermal stability and possible charge carrier transport due to molecular packing, suggest that these molecules are promising for optoelectronic applications. Overall, this work contributes to the development of the use of thiazolo[5,4-d]thiazole in liquid crystals, demonstrating its great efficiency and versatility.
Selective NIR chromophores: Bis(pyrrolopyrrole) cyanines
Fischer, Georg M.,Daltrozzo, Ewald,Zumbusch, Andreas
, p. 1406 - 1409 (2011/04/18)
Very invisible: Bis(pyrrolopyrrole) cyanines are extended chromophores based on diketopyrrolopyrroles (general structure shown). The compounds are characterized by extremely high extinction coefficients, narrowband absorption in the near-IR range, and str
Room-temperature discotic liquid-crystalline coronene diimides exhibiting high charge-carrier mobility in air
An, Zesheng,Yu, Junsheng,Domercq, Benoit,Jones, Simon C.,Barlow, Stephen,Kippelen, Bernard,Marder, Seth R.
experimental part, p. 6688 - 6698 (2010/05/19)
Six N,N′,5,11-tetrasubstituted coronene-2,3,8,9-tetracarboxydiimides have been synthesised incorporating 3,4,5-tri(n-dodecyloxy)phenyl or 2-(n-decyl)-n-tetradecyl groups in various positions. Differential scanning calorimetry, polarised optical microscopy, and X-ray diffraction indicate that all form columnar discotic mesophases from around room temperature to around 200 °C. Charge-carrier mobility values, which energetic considerations suggest are electron mobility values, have been determined in non-aligned samples cooled from the isotropic melt using the space-charge-limited current technique. The highest mobility, 6.7 cm2 V-1 s-1, was found in N,N′-bis(n-2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecylfluorooctyl)-5,11- bis(3-[{3,4,5-tri(n-dodecyloxy)phenyl}carbonyloxy]-n-propyl)coronene-2,3,8, 9-tetracarboxydiimide, which X-ray diffraction suggests is the most highly ordered of the materials examined.
Perylene Charge-Transport Materials, Methods of Fabrication Thereof, and Methods of Use Thereof
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Page/Page column 12-13, (2008/12/07)
Briefly described, embodiments of this disclosure include perylenetetracarboxylic diimide charge-transport materials, methods of forming perylenetetracarboxylic diimide charge-transport materials, and methods of using the perylenetetracarboxylic diimide charge-transport materials.
