56486-55-6Relevant articles and documents
Hydrogen Bond-Induced Rigid Oligoanthranilamide Ribbons That Are Planar and Straight
Wu, Zong-Quan,Jiang, Xi-Kui,Zhu, Shi-Zheng,Li, Zhan-Ting
, p. 229 - 232 (2004)
(Matrix presented) A new series of oligoanthranilamides has been synthesized starting from suitably modified p-phenylenediamine and p-phthalic acid derivatives. Due to strong intramolecular three-center hydrogen bonds, the new oligomers self-assemble into highly stable straight and planar molecular ribbons, which have been characterized by X-ray crystallography and 1H NMR, IR, and UV-vis spectroscopy.
(Poly)terephthalates with Efficient Blue Emission in the Solid State
Shimizu, Masaki,Shigitani, Ryosuke,Kinoshita, Takumi,Sakaguchi, Hiroshi
, p. 1792 - 1800 (2019/01/08)
We prepared dimethyl and diaryl 2,5-dialkoxytere-phthalates from dimethyl 2,5-dihydroxyterephthalate in good-to-high yields via alkylation or a sequence of alkylation, hydrolysis, chlorination, and condensation. The absorption spectra of the dialkoxyterephthalates contain a small band at 332–355 nm, which could be assigned to intramolecular charge-transfer transition from the alkoxy to alkoxycarbonyl groups on the basis of theoretical calculations using density functional theory. The dialkoxyterephthalates exhibited blue fluorescence with moderate-to-excellent quantum yields not only in solution but also in the solid state, such as a poly(methyl methacrylate) (PMMA) film and a powder. The solid-state quantum yields of the diisopropoxy-substituted terephthalates were similar or considerably higher than those of the dimethoxy-substituted counterparts. Copolymerization of 2,5-diisopropoxyterephthaloyl chloride and 1,4-butanediol with or without terephthaloyl chloride gave brilliantly blue fluorescent polymers, whose quantum yields were 0.72 and 0.71 in toluene and 0.46 and 0.40 in the neat film, respectively. Furthermore, white emission was achieved when a fluorescent yellow 2,5-diaminoterephthalate was doped into the thin film of the blue fluorescent polymer at 0.4 wt %.
Synthesis, spectroscopic and electrochemical properties of mononuclear and dinuclear bis(bipy)ruthenium(II) complexes containing dimethoxyphenyl(pyridin-2-yl)-1,2,4-triazole ligands
Passaniti, Paolo,Browne, Wesley R.,Lynch, Fiona C.,Hughes, Donal,Nieuwenhuyzen, Mark,James, Paraic,Maestri, Mauro,Vos, Johannes G.
, p. 1740 - 1746 (2007/10/03)
The ligands HL1 and H2L2 and the complexes [Ru(bipy)2L1]PF6·2H2O 1, [(Ru(bipy)2)2L2](PF6)2·7H 2O 2, { where HL1 = 3-(2′,5′-dimethoxyphenyl)-5-(pyridin-2″-yl)-1 H-1,2,4-triazole, H2L2 = 1,4-bis(5′-(pyridin-2″-yl)- 1′H-1′,2′,4′-triazol-3′-yl)-2,5-dimethoxybenzene and bipy = 2,2′-bipyridyl}, have been prepared and characterised, by NMR, UV-vis and emission spectroscopies and by electrochemical measurements. X-Ray crystal structures of ligands HL1, H2L2 and of the complex 1 are also reported. The dinuclear complex (2) exhibits a weak electronic interaction between the metal centres, which is modulated by the protonation state of the 1,2,4-triazole rings. The extent of the metal-metal interaction in these systems is compared with that observed in other pyridyl-1,2,4-triazole based dinuclear compounds of differing metal-metal distances.
