Indexed by:Journal Papers

Date of Publication:2019-09-18

Journal:CHEMISTRY-A EUROPEAN JOURNAL

Included Journals:PubMed、SCIE

Volume:25

Issue:52

Page Number:12221-12227

ISSN No.:0947-6539

Key Words:aromatic embraces; crystal engineering; polymers; self-assembly; supramolecular chemistry

Abstract: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.