As eries of donor-p-acceptor-p-donor (D-p-A-p-D) benzoazole dyes with 2H-benzo[d][1,2,3]triazole or BTD cores have been prepared and their photophysical properties characterized. The properties of these compounds display remarkable differences, mainly as ar esult of the electron-donor substituent. Dyes with the best properties have visible-light absorptionover l = 400 nm, large Stokess hifts in the range of about3 500-6400 cm À1 ,a nd good fluores-cence emissionw ith quantum yields of up to 0.78. The twophotona bsorption propertiesw ere also studied to establish the relationship betweens tructure and properties in the differentc ompounds synthesized. Theser esults provided cross sections of up to 1500 GM, with ap redominance of S 2 ! S 0 transitions andahigh charge-transfer character.T ime-dependent DFT calculations supported the experimental results.
In this work, as an equivocal proof of the potential of microwave irradiation in organic synthesis, a complex pyrazine-decorated benzotriazole derivative that is challenging to prepare under conventional conditions has been obtained upon microwave irradiation, thus efficiently improving the process and yields, dramatically decreasing the reaction times and resulting in an environmentally friendly synthetic procedure. In addition, this useful derivative could be applied in organic electronics, specifically in organic field-effect transistors (OFETs), exhibiting the highest electron mobilities reported to date for benzotriazole discrete molecules, of around 10−2 cm2V−1s−1.
We report here the preparation of co-assembled microcrystals by employing an easy, reproducible and cost-effective technique, namely slow diffusion. 2,3]triazole and benzo [c][1,2,5]thiadiazole were chosen as host and guest skeletons, respectively. Structural similarities allowed the correct co-assembly of the two structures. The co-assemblies were studied by different techniques that included Raman spectroscopy and X-ray diffraction, amongst others. The waveguiding properties and the emission colour of the doped organic microcrystals were also investigated. It was found that changes in the molar ratio of the different doping agents could tune the light emission. Fluorescence microscopy images of the co-assembled microcrystals revealed light colour changes from green to whitish, up to CIE coordinates of (0.370, 0.385). These tunable colour-active materials could be useful in the fields of optoelectronics or lab-on-a-chip for integrated optical circuits at micro-/nanoscale.
Two non-fullerene acceptors, A-D-A'-D-A systems, with an identical central 2-(3,5-bis(trifluoromethyl)phenyl)-2H-benzo[d][1,2,3]triazole (CF3-BTA) (A') connected with 4,4-bis (2-ethylhexyl) -4H-cyclopenta[2,1-b]3,4-b']dithiophene (CPDT) (D), to differents end capped acceptor units, namely tricyanoethylene (TOCR1) and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-yldene)malononitrile...
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