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论文类型：期刊论文

发表时间：2019-09-18

发表刊物：CHEMISTRY-A EUROPEAN JOURNAL

收录刊物：PubMed、SCIE

卷号：25

期号：52

页面范围：12221-12227

ISSN号：0947-6539

关键字：aromatic embraces; crystal engineering; polymers; self-assembly; supramolecular chemistry

摘要：Frequently encountered in crystalline materials, aromatic embraces (AEs) are formed when arylated molecules interact through multiple concerted aromatic interactions. AEs are a robust motif that is suitable for the preparation of amorphous bulk supramolecular polymers (BSPs). Crystal engineering revealed that the polymorphic compound (PPh3)(Cp)Fe(CO){CO(CH2)(5)CH3} (Cp=cyclopentadienyl), known as FpC(6), assembled into various chain structures through several AE motifs. Upon melting, FpC(6) always adopted the same AE motif, which extended into the corresponding embracing "ladder" chains. The resultant BSP displayed typical polymer behaviour, including the presence of a glass transition and viscoelasticity, which allowed the effect of thermal history on the polymerisation behaviour to be explored. The ladder chains formed by the AE remain assembled at temperatures of up to 130 degrees C and were able to effectively suppress crystallisation during cooling. The ability of the AE to form chains at high temperatures and suppress crystallisation is a new opportunity to advance the field of BSPs and supramolecular chemistry.