Synthesis and optical properties of novel blue fluorescent conjugated polymers
作者:Martin Baumgarten、Timucin Yüksel
DOI:10.1039/a808590k
日期:——
In the present paper we describe new approaches towards the synthesis of conjugated polymers with defined conjugation length, resulting in a blue or green fluorescence. The new approach reported here is to use 1,3-phenylene (type 1) and 10,10′-bianthrylene (type 2) bridges of conjugated segments such as stilbenes and thiophenes which can easily be varied to further change the optical properties.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Regioselective Deuteration of Electron-Rich Aromatic and Heteroaromatic Compounds
作者:Wu Li、Ming-Ming Wang、Yuya Hu、Thomas Werner
DOI:10.1021/acs.orglett.7b02701
日期:2017.11.3
Deuterium labeled compounds find widespread application in life science. Herein, the deuteration of electron-rich (hetero)aromaticcompounds employing B(C6F5)3 as the catalyst and D2O as the deuterium source is reported. This protocol is highly efficient, simply manipulated, and successfully applied in the deuteration of 23 substrates including natural neurotransmitter-like melatonin. It is assumed
氘标记的化合物在生命科学中得到广泛应用。在此,报道了以B(C 6 F 5)3为催化剂,D 2 O为氘源的富电子(杂)芳族化合物的氘化。该协议高效,简单易操作,并成功应用于包括自然神经递质类褪黑激素在内的23种底物的氘化。假定O–D键的弱化最终导致亲电性D +的形成。
Cobalt-Catalyzed Reductive Alkylation of Heteroaryl Bromides: One-Pot Access to Alkylthiophenes, -furans, -selenophenes, and -pyrroles
作者:Deng-Jhou Cai、Po-Han Lin、Ching-Yuan Liu
DOI:10.1002/ejoc.201500784
日期:2015.8
A practical and convenient Co-catalyzed alkylation method for the facile introduction of various alkyl chains into organic electronically significant heteroaryl compounds, including thiophenes, furans, selenophenes, and pyrroles, is reported. Under well-optimized reaction conditions, a wide range of alkylated heteroaryl compounds have beeen efficiently prepared in moderate to good isolated yields.
Self-assembly behaviour of conjugated terthiophenesurfactants in water
作者:Patrick van Rijn、Dainius Janeliunas、Aurélie M. Brizard、Marc C. A. Stuart、Ger J. M. Koper、Rienk Eelkema、Jan H. van Esch
DOI:10.1039/c0nj00760a
日期:——
Conjugated self-assembled systems in water are of great interest because of their potential application in biocompatible supramolecular electronics, but so far their supramolecular chemistry remains almost unexplored. Here we present amphiphilic terthiophenes as a general self-assembling platform for the construction of conjugated aggregates, providing access to aggregates with different morphologies without changing the basic molecular design. We explored the design parameters of these amphiphilic terthiophenes in detail, leading to the selection and synthesis of in total 8 new amphiphilic oligothiophenes. Their aggregation behaviour was investigated by absorbance and fluorescence spectroscopy, dynamic light scattering, and cryo-transmission electron microscopy. Critical micelle concentrations as low as 0.01 mM were found and different sized aggregates ranging from several nanometres up to 200 nm. The aggregate morphology could also be tuned by changing the substitution pattern of hydrophilic and hydrophobic moieties, leading to different types of aggregates ranging from globular- and elongated micelles to bilayers. Remarkably, aggregation had only little effect on the electronic and spectroscopic properties of the oligothiophenes, which will be of interest for their application in supramolecular electronics.
self-assemble into a series of liquid-crystallinehoneycombs, formed by the π-conjugated rods which enclose polygonal prismatic cells filled by the lateral chains. With increasing chain length a discontinuous transition from triangular to square honeycombs takes place. At this transition a periodic honeycomb composed of a mixture of square and triangular cells in a ratio 1 : 2 was formed at low temperature, whereas