Aromatic Embrace Motifs for Bulk Supramolecular Polymers. Issue 52 (23rd August 2019)

• Record Type: Journal Article
• Authors: Lanigan, Nicholas; Assoud, Abdeljalil; Zhang, Wei; Wang, Xiaosong
• Is Part Of: Chemistry. Volume 25:Issue 52(2019)
• Page Start: 12221
• Page End: 12227
• Publication Date: 2019-08-23
• Subjects: aromatic embraces -- crystal engineering -- polymers -- self-assembly -- supramolecular chemistry; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201903138
• Languages: English
• ISSNs: 0947-6539

Abstract

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 FpC6, assembled into various chain structures through several AE motifs. Upon melting, FpC6 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 °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. Abstract : Give us a hug ! Aromatic embraces are shown to be a new robust motif suitable for the preparation of bulk supramolecular polymers (see figure). These supramolecular polymers remain assembled at relatively high temperatures and display typical polymer behaviour. This study demonstrates the exciting potential of aromatic embraces to inspire new monomer designs.