223799-08-4Relevant academic research and scientific papers
Synthesis of hyperbranched platinum-poly(yne) polymers by self polycondensation
Onitsuka, Kiyotaka,Ohshiro, Nobuaki,Fujimoto, Masanori,Takei, Fumie,Takahashi, Shigetoshi
, p. 159 - 166 (2000)
A hyperbranched polymer constructed by platinum-acetylide units has been synthezied by self polycondensation of a dinuclear platinum complex having one terminal acetylene and two platinum-chloride groups as an AB2 monomer in the presence of a c
Synthesis of conjugated aryleneethynylenesiloles dendron
Liu, Jie,Yan, Chenxu,Li, Shanshan,Wang, Chengyun,Shen, Yongjia
, p. 2861 - 2868 (2013/08/23)
Three routes were designed to synthesize a π-conjugated aryleneethynylenesiloles dendron. With the desilylation of the disilole mono(silylethynyl) derivative in the presence of potassium carbonate (K 2CO3), the silole-containing oligomer has been successfully synthesized without impact on the Si-(CH3)2 group. The disilole mono(silylethynyl) derivative was prepared by means of the Sonogashira heterocoupling reaction between the diacetylene compound and asymmetrical silole, catalyzed by the dichloro bis(triphenylphosphine)palladium, in a divergent synthesis. Due to their steric effect and triethynylbenzene self-coupling Glaser reaction, the endeavour to prepare the dendron by controlling the molar ratio of asymmetrical silole and 1,3,5-triethynylbenzene was failed. The another attempt to prepare the dendron by different desilylation condition of triisopropylsilyl group and trimethylsilyl group was also failed, the desilylation of Si-(CH3)2 group in silacyclopentadiene unit was also easily accomplished in the presence of tetrabutylammonium fluoride(Bu4NF), whereas no reaction occurred when K 2CO3 was used instead of Bu4NF. Copyright
Studies toward the synthesis of phenylacetylene macrocycle based rotaxane precursors as building blocks for organic nanotubes
Cantin, Katy,Lafleur-Lambert, Antoine,Dufour, Philippe,Morin, Jean-Francois
, p. 5335 - 5349 (2012/10/30)
Synthetic efforts toward the preparation of rotaxane precursors based on phenylacetylene macrocycles (PAM) are described. The aim of this study was to determine the optimal structural parameters to prepare high-molecular-weight rotaxane precursors through a strategy involving two Sonogashira couplings to attach bulky blockers on the PAM core. PAMs with different sizes and functions were prepared and coupled to different blockers to assess whether or not the resulting structure adopts a rotaxane-like conformation in which the rigid rod forms after the Sonogashira coupling threads through the PAM. Copyright
Conjugated polyelectrolyte dendrimers: Aggregation, photophysics, and amplified quenching
Feng, Fude,Lee, Seoung Ho,Cho, Sung Won,Koemuerlue, Sevnur,McCarley, Tracy D.,Roitberg, Adrian,Kleiman, Valeria D.,Schanze, Kirk S.
, p. 16679 - 16691 (2013/02/23)
Conjugated polyelectrolyte dendrimers (CPDs) are monodisperse macromolecules that feature a fully π-conjugated dendrimer core surrounded on the periphery by ionic solubilizing groups. CPDs are soluble in water and polar organic solvents, and they exhibit photophysics characteristic of the π-conjugated chromophores comprising the dendrimer core. Here we describe the synthesis and photophysical characterization of series of three generations of CPDs based on a phenylene ethynylene repeat unit structure that is surrounded by an array of anionic sodium carboxylate groups. Molecular dynamics simulations indicate that the first-generation CPD is flat while the second- and third-generation CPDs adopt oblate structures. Photophysical studies, including absorption, fluorescence spectroscopy, and lifetimes, show that the ester protected precursor dendrimers exhibit highly efficient blue fluorescence in THF solution emanating from the phenylene ethynylene chromophore that is in the dendrimer core. By contrast, the water-soluble CPDs have much lower fluorescence quantum yields and the absorption and fluorescence spectra exhibit features of strong chromophore-chromophore interactions. The results are interpreted as suggesting that the CPDs exist as dimer or multimer aggregates, even in very dilute solution. Fluorescence quenching of the anionic CPDs with the dication electron acceptor N,N′-dimethylviologen (MV2+) is very efficient, with Stern-Volmer quenching constants (KSV) increasing with generation number. The third-generation CPD exhibits highly efficient amplified quenching, with KSV ～ 5 × 106 M -1.
Convergent synthesis of platinum-acetylide dendrimers
Onitsuka, Kiyotaka,Fujimoto, Masanori,Kitajima, Hotaka,Ohshiro, Nobuaki,Takei, Fumie,Takahashi, Shigetoshi
, p. 6433 - 6446 (2007/10/03)
An efficient convergent route to the main chain type of organometallic dendrimers, in which platinum moieties are linked by 1,3,5-triethynylbenzene, has been developed. The synthesis of platinum-acetylide dendrons involved the use of two types of trialkylsilyl groups for protection of the terminal acetylene. The platinum-acetylide dendrimers were prepared up to the third generation by reacting dendrons with a triplatinum core and a tetraplatinum core. Spectroscopic characterization and trace experiments by gel permeation chromatography indicated that the dendrimer molecules have no structural defects. Although a π-conjugated system was used as the bridging ligand, electronic and fluorescence spectra suggested that the interaction among the platinum-acetylide moieties in the dendrimers was small.
Convergent route to organometallic dendrimers composed of platinum- acetylide units
Onitsuka,Fujimoto,Ohshiro,Takahashi
, p. 689 - 692 (2007/10/03)
The third-generation dendrimer with 45 platinum atoms (shown schematically) was synthesized efficiently by a convergent methodology in which two different trialkylsilyl groups (symbolized by the nodal points) are used to protect the bridging triethynylben
