نتایج جستجو برای: phenylene
تعداد نتایج: 2124 فیلتر نتایج به سال:
Immobilization of organic molecules on metal surfaces and their coupling via thermally induced C–C bond formation is an important technique in polymer synthesis. Using this approach, insoluble reactive carbon nanostructures can be synthesized the reactions monitored situ using scanning probe microscopy methods. The diversity conceivable products, however, limited by number variety known on-surf...
The synthesis of various periodic mesoporous organosilica nanoparticles (nanoPMOs) from the corresponding organo-bridged bis(triethoxy)silanes is described. A strong influence sodium hydroxide concentration observed, leading to sizes or morphologies depending on precursor. In particular, in case ethenylene linker, morphology evolves small flakes elongated particles, while phenylene precursor, w...
Azomethine (C=N) and azo (N=N) scaffolds are a part of structural units in poly(p-phenylene azomethine) (PAM) azo) (PAZ), respectively. Poly(p-phenylene vinylene) (PPV) is known to be one luminescent π-conjugated polymers, meanwhile PAM PAZ, which the aza-substituted PPV analogues, regarded as weak or no emissive materials. However, by boron complexation, intense emission can induced. Furthermo...
A series of single-walled carbon nanotube precursors, C3h-symmetric cyclotri(ethynylene)(biphenyl-2,4'-diyl) and cyclotri(ethynylene)(p-terphenyl-2,4″-diyl), have been prepared by a linear stepwise oligomerization-cyclization route and by statistical intermolecular cyclooligomerization. In addition to producing these members of a novel class of arylene ethynylene macrocycles, 1 and 2, the latte...
One-electron reduction of the "extended viologen" dication 1 yields the red cation radical 2, characterized by strong near-IR absorption. It has been generated and studied by pulse radiolytic, electrochemical, redox titration, UV-visible, and electron paramagnetic resonance spectroscopic methods. All results are in agreement with a fully delocalized electronic structure for 2.
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