1262014-66-3Relevant academic research and scientific papers
π-expanded α,β-unsaturated ketones: Synthesis, optical properties, and two-photon-induced polymerization
Nazir, Rashid,Bourquard, Florent,Baliunas, Evaldas,Smole, Sabina,Gray, David,Tkachenko, Nikolai V.,Farsari, Maria,Gryko, Daniel T.
, p. 682 - 690 (2015)
A library of π-expanded α,β-unsaturated ketones was designed and synthesized. They were prepared by a combination of Wittig reaction, Sonogashira reaction, and aldol condensation. It was further demonstrated that the double aldol condensation can be performed effectively for highly polarized styrene- and diphenylacetylene-derived aldehydes. The strategic placement of two dialkylamino groups at the periphery of D-π-A-π-D molecules resulted in dyes with excellent solubility. These ketones absorb light in the region 400-550 nm. Many of them display strong solvatochromism so that the emission ranges from 530-580 nm in toluene to the near-IR region in benzonitrile. Ketones based on cyclobutanone as central moieties display very high fluorescence quantum yields in nonpolar solvents, which decrease drastically in polar media. Photophysical studies of these new functional dyes revealed that they possess an enhanced two-photon absorption cross section when compared with simpler ketone derivatives. Due to strong polarization of the resulting dyes, values of two-photon absorption cross sections on the level of 200-300 GM at 800 nm were achieved, and thanks to that as well as the presence of the keto group, these new two-photon initiators display excellent performance so that the operating region is 5-75 mW in some cases.
Supramolecularly engineered aggregation of a dipolar dye: Vesicular and ribbonlike architectures
Yagai, Shiki,Nakano, Yujiro,Seki, Shu,Asano, Atsushi,Okubo, Takashi,Isoshima, Takashi,Karatsu, Takashi,Kitamura, Akihide,Kikkawa, Yoshihiro
supporting information; experimental part, p. 9990 - 9994 (2011/02/26)
It's all in the packing: Self-assembly of the title system through hydrogen bonding and then aggregation led to vesicle formation, and capping of the hydrogen-bonding moieties with subsequent aggregation led to ribbons. The resulting self-assembled archit
