176650-93-4Relevant articles and documents
Dendritic [2]rotaxanes: Synthesis, characterization, and properties
Liu, Guoxing,Li, Ziyong,Wu, Di,Xue, Wen,Li, Tingting,Liu, Sheng Hua,Yin, Jun
, p. 643 - 652 (2014/04/03)
A series of dendritic ammonium salts have been designed and synthesized. Subsequently, they were used to construct the corresponding [2]rotaxanes by a template-directed clipping approach. Unusually, two unsymmetrical dendritic [2]rotaxanes containing fluorophore (pyrene units) were also obtained; their optical properties, such as UV/vis absorption and fluorescence, were measured. The results indicate that these two rotaxanes possess stronger intermolecular interaction in the solid state than in solution. As a result, solutions of high concentration readily formed the excimer. These special rotaxanes might be applied in dynamic fluorescence-reponsive materials, and the rotaxane structure will also be used as a strategy to adjust the aggregated behaviors of fluorescent molecules.
Dendrimer diarylethenes: The memory effect of conformation in polymer matrices
Fujimoto, Yuhei,Ubukata, Takashi,Yokoyama, Yasushi
supporting information; experimental part, p. 5755 - 5757 (2009/04/13)
Photochromic dendrimer diarylethenes with a C-2-connected bisbenzothienylethene core were synthesized; the most notable feature of them is the strong memory effect of cyclizable conformation of the open form when generated from the closed form by visible
Chromophore-labeled dendrons as light harvesting antennae
Stewart, Gina M.,Fox, Marye Anne
, p. 4354 - 4360 (2007/10/03)
A novel series of polyether dendrimer segments (dendrons) end-capped with pyrenyl, naphthyl, or methyl groups has been prepared by a convergent growth method. Steady-state fluorescence measurements indicate the absence of intramolecular naphthalene excimer in the naphthyl-capped dendrons. However, in the pyrenyl-capped dendrons, excimer emission predominates. Fluorescence from both the naphthyl monomer and pyrenyl excimer are quenched when a suitable electron donor (e.g., a 3-[dimethylamino]phenoxy group) is covalently attached at the dendron focal point. No sensitized emission from the dendron backbone is observed in the chromophore-labeled dendrons, although the control methyl-capped dendron fluoresces weakly at 310 nm when excited at 284 nm. Absorption and fluorescence spectra, fluorescence quantum yields, and fluorescence lifetimes for the chromophore-labeled dendrons axe reported.