Qiu Yunyan, Mohin Jacob, Tsai Chia-Hua, Tristram-Nagle Stephanie, Gil Roberto R, Kowalewski Tomasz, Noonan Kevin J T
Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
Macromol Rapid Commun. 2015 May;36(9):840-4. doi: 10.1002/marc.201500030. Epub 2015 Mar 10.
A commercially available palladium N-heterocyclic carbene (Pd-NHC) precatalyst is used to initiate chain-growth polymerization of 2-bromo-3-hexyl-5-trimethylstannylthiophene. The molecular weight of the resultant poly(3-hexylthiophene) can be modulated (7 to 73 kDa, Đ = 1.14 to 1.53) by varying the catalyst concentration. Mass spectrometry data confirm control over the polymer end groups and (1)H NMR spectroscopy reveals that the palladium catalyst is capable of "ring-walking". A linear relationship between Mn and monomer conversion is observed. Atomic force microscopy and X-ray scattering verify the regioregular nature of the resultant polythiophene.
一种市售的钯氮杂环卡宾（Pd-NHC）预催化剂用于引发2-溴-3-己基-5-三甲基锡基噻吩的链增长聚合反应。通过改变催化剂浓度，可以调节所得聚（3-己基噻吩）的分子量（7至73 kDa，Đ = 1.14至1.53）。质谱数据证实了对聚合物端基的控制，并且1H NMR光谱表明钯催化剂能够“环行”。观察到Mn与单体转化率之间存在线性关系。原子力显微镜和X射线散射证实了所得聚噻吩的区域规整性。
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