5259-09-6Relevant academic research and scientific papers
Highly Luminescent Encapsulated Narrow Bandgap Polymers Based on Diketopyrrolopyrrole
Leventis, Anastasia,Royakkers, Jeroen,Rapidis, Alexandros G.,Goodeal, Niall,Corpinot, Merina K.,Frost, Jarvist M.,Bu?ar, Dejan-Kre?imir,Blunt, Matthew Oliver,Cacialli, Franco,Bronstein, Hugo
supporting information, p. 1622 - 1626 (2018/02/17)
We present the synthesis and characterization of a series of encapsulated diketopyrrolopyrrole red-emitting conjugated polymers. The novel materials display extremely high fluorescence quantum yields in both solution (>70%) and thin film (>20%). Both the absorption and emission spectra show clearer, more defined features compared to their naked counterparts demonstrating the suppression of inter and intramolecular aggregation. We find that the encapsulation results in decreased energetic disorder and a dramatic increase in backbone colinearity as evidenced by scanning tunnelling microscopy. This study paves the way for diketopyrrolopyrrole to be used in emissive solid state applications and demonstrates a novel method to reduce structural disorder in conjugated polymers.
Synthesis, structure, and binding properties of lipophilic cavitands based on a calix[4]pyrrole-resorcinarene hybrid scaffold
Galán, Albano,Escudero-Adán, Eduardo C.,Frontera, Antonio,Ballester, Pablo
, p. 5545 - 5557 (2014/07/08)
We report the synthesis, structural characterization, and binding properties of a series of unprecedented cavitands based on a meso-dodecyl-calix[4]pyrrole-resorcin[4]arene hybrid scaffold. The reported structural and conformational features of the prepared cavitands are derived from results obtained in solution, solid state, and molecular modeling studies. In the solid state, these cavitands are exclusively observed in the kite C 4 structure and as a racemic mixture of two cyclochiral conformers, which are interconverting fast on the 1H NMR time scale, according to solution studies. In agreement, molecular modeling studies assign an energy preference for the kite conformer of the cavitands. The polar interior of the synthesized containers allows for the inclusion of a series of pyridine N-oxide derivatives. This results in the formation of 1:1 complexes that are kinetically and thermodynamically highly stable. The putative switching process between the vase and kite forms of these cavitands is investigated in solution by means of variable temperature 1H NMR experiments. N-Oxide guests that are size and shape complementary to the volume of the cavity of the vase form are also employed to facilitate its emergence. All of the results obtained indicate the existence of a remarkable preference toward the kite conformation both in free and bound calix[4]pyrrole-based cavitands.
Synthesis of doubly strapped meso-meso-linked porphyrin arrays and triply linked conjugated porphyrin tapes
Ikeda, Toshiaki,Lintuluoto, Juha M.,Aratani, Naoki,Zin, Seok Yoon,Kim, Dongho,Osuka, Atsuhiro
, p. 3193 - 3204 (2007/10/03)
1,10-Dioxydecamethylene doubly strapped ZnII-porphyrin S1 was prepared and treated with AgPF6 to give meso-meso-linked porphyrin oligomers Sn (n = 2, 3, 4, 6, 8, and 12), which were converted to triply linked porphyrin tapes TSn by m
5-Alkylresorcinols from Hakea trifurcata that cleave DNA
Lytollis, William,Scannell, Ralph T.,An, Haoyun,Murty,Reddy, K. Sambi,Barr, John R.,Hecht, Sidney M.
, p. 12683 - 12690 (2007/10/03)
A dichloromethane extract of Hakea trifurcata that mediated relaxation of ?X174 replicative form DNA at micromolar concentrations in the presence of Cu2+ was resolved into six active components by bioassay-guided fractionation. Five of the acti
