A Supramolecular [10]CPP Junction Enables Efficient Electron Transfer in Modular Porphyrin–[10]CPP⊃Fullerene Complexes
作者:Youzhi Xu、Bingzhe Wang、Ramandeep Kaur、Martin B. Minameyer、Michael Bothe、Thomas Drewello、Dirk M. Guldi、Max von Delius
DOI:10.1002/anie.201802443
日期:2018.9.3
electron transfer was observed across a [10]cycloparaphenylene ([10]CPP) moiety that serves as a rigid non‐covalentbridge between a zinc porphyrin and a range of fullerenes. The preparation of iodo‐[10]CPP is the key to the synthesis of a porphyrin–[10]CPP conjugate, which binds C60, C70, (C60)2, and other fullerenes (KA>105 m−1). Fluorescence and pump–probe spectroscopy revealed intramolecular energy
Triarylborane-containing polyacetylene derivatives (2a–c) were synthesized by the polymerization of the corresponding monomers with Rh+(nbd)[C6H5B−(C6H5)3] catalyst. The anion sensing ability of 2a–c was examined by using tetra-n-butylammonium salts of a series of halide ions. UV-vis absorption and emission measurements revealed that these polymers could selectively detect F−, while they did not show any response for Cl−, Br−, and I−. The fluoride sensing properties of these polymers are highly dependent on the structure of the spacers between the conjugated main chain and boron atoms. Namely, 2a containing fluorenyl moieties exhibited a “turn on” fluorescence F− sensing ability. 2b having phenyl spacers displayed emission quenching upon addition of F− in solution, and a signal amplification phenomenon was observed compared to the corresponding monomer. Addition of F− changed the color of the biphenyl group-containing 2c in THF from yellow to orange, indicating that 2c can be used as a colorimetric sensor.
V‐shaped string formations combined with Y‐shaped bifurcation motifs result in a random reticulation on the entire surface. DFT calculations show that the C−H⋅⋅⋅πδ− transition state of the reaction between the deprotonated alkyne group and a nearby H‐donor of the alkene group plays a key role in the mechanism and high chemoselectivity. This study highlights a concept that opens new avenues to the surface‐confined
Efficient, High-Yield Route to Long, Functionalized <i>p</i>-Phenylene Oligomers Containing Perfluorinated Segments, and Their Cyclodimerizations by Zirconocene Coupling
作者:Jonathan R. Nitschke、T. Don Tilley
DOI:10.1021/ja011018s
日期:2001.10.1
sterically hindered substrates and in the presence of base-sensitive silylalkynyl groups. Diynes synthesized by this methodology were readily zirconocene-coupled into large dimeric macrocycles using the zirconocene reagent Cp(2)Zr(py)(Me(3)SiC triple bond CSiMe(3)).
synthesized. The compounds themselves are efficient push–pull emitters and exhibit bright fluorescence in blue and near-UV regions. P1–P4 were used as alkynyl ligands to obtain a series of homoleptic bis-alkynyl Au(I) complexes 1–4. The complexes demonstrate bright phosphorescence and dual emission with dominating phosphorescence (2–4). Terphenyl derivative complex 3 exhibits warm white emission in DMSO solution