نتایج جستجو برای: oligothiophene
تعداد نتایج: 259 فیلتر نتایج به سال:
The diradical characters (y) and third-order nonlinear optical (NLO) properties of open-shell quinoidal oligothiophene derivatives with phenoxyl groups, and the corresponding reduced (hydrogenated)-state oligomers, are investigated by using the broken-symmetry density functional theory method. The oxidized (dehydrogenated) states are predicted to have an open-shell singlet ground state and thei...
[reaction: see text] A new iterative synthesis of regioregular oligothiophenes has been developed in which "double-coupling" after each iteration minimizes deletion sequences. The method exploits the susceptibility of alpha-silyl- but not alpha-germyl-substituted thiophene derivatives toward nucleophilic ipso-protodemetalation and features an unusual "base-free" Suzuki-type cross-coupling proto...
Abstract Glioblastoma (GBM) is an aggressive nervous system tumor with a mean survival time of 12-14 months. Cells neural stem cell-like properties can be derived from GBM tumors. These cells seem to escape conventional irradiation treatment, chemotherapy, and surgery, may play crucial role for relapse. It therefore urgent develop novel approaches reliable detection in GBM. Here we report lumin...
We perform a combined experimental and theoretical approach to establish the atomistic origin of energy dissipation occurring while imaging a molecular surface with an amplitude modulation atomic force microscope. We show that the energy transferred by a single nano-asperity to a sexithiophene monolayer is about 0.15 eV/cycle. The configuration space sampled by the tip depends on whether it app...
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