A Versatile and Efficient Strategy to Discrete Conjugated Oligomers
作者:Jimmy Lawrence、Eisuke Goto、Jing M. Ren、Brenden McDearmon、Dong Sub Kim、Yuto Ochiai、Paul G. Clark、David Laitar、Tomoya Higashihara、Craig J. Hawker
DOI:10.1021/jacs.7b05299
日期:2017.10.4
discrete conjugatedoligomers (Đ = 1.0) using the combination of controlled polymerization and automated flash chromatography is reported. From this two-step process, a series of discrete conjugatedmaterialsfrom dimers to tetradecamers could be isolated in high yield with excellent structural control. Facile and scalable access to monodisperse libraries of different conjugatedoligomers opens pathways
Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron–Electron Resonance
作者:Dennis Bücker、Annika Sickinger、Julian D. Ruiz Perez、Manuel Oestringer、Stefan Mecking、Malte Drescher
DOI:10.1021/jacs.9b11404
日期:2020.1.29
Synthetic polymers are mixtures of chains with different lengths, and their chain length and chain conformation are often experimentally characterized by ensemble averages. We demonstrate that double electron-electron resonance (DEER) spectroscopy can reveal the chain length distribution and the chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura
合成聚合物是不同长度链的混合物,它们的链长和链构象通常通过整体平均进行实验表征。我们证明双电子-电子共振 (DEER) 光谱可以揭示来自受控 Suzuki-Miyaura 偶联聚合的低聚-(9,9-二辛基芴)中单个正聚体的链长分布和链构象和灵活性。所需的自旋标记链末端分别通过 TEMPO 取代的引发剂和链终止剂与原位催化剂体系有效地引入。通过逐步方法获得作为参考材料的单个精确链长低聚物。还可以在聚(芴)纳米粒子中访问链长度分布、链构象和灵活性。