Monodisperse Oligo(p-phenylene–butadiynylene)s: GPC Conversion Factors and Self-Assembled Monolayers

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• 作者：Florian Hinderer ; Robert May ; Stefan-S. Jester ; Sigurd Höger
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：March 8, 2016
• 年：2016
• 卷：49
• 期：5
• 页码：1816-1821
• 全文大小：380K
• ISSN：1520-5835

文摘

Alkyl- and alkoxy-substituted p-phenylene–butadiynylene tetramers, obtained via a stepwise synthesis, are polymerized under Glaser coupling conditions. The fractionation of the oligomers by recycling gel permeation chromatography (recGPC) yields three sets of monodisperse oligo(p-phenylene–butadiynylene)s (OPBs) with degrees of polymerization n = 4, 8, 12, ..., 60. Subsequent GPC analysis of these oligomers provides three sets of size- and substituent-dependent conversion factors that quantify the overestimation of the oligomer molecular weight when a polystyrene (PS) calibrated GPC system is used for the data analysis. Scanning tunneling microscopy (STM) of representative oligomers at the solid/liquid interface visualizes the monodispersity, the length-dependent rigidity, and their assembling behavior.