Supramolecular Porphyrin Copolymer Assembled through Host–Guest Interactions and Metal–Ligand Coordination. (21st October 2015)

• Record Type: Journal Article
• Authors: Kinjo, Kanashi; Hirao, Takehiro; Kihara, Shin‐ichi; Katsumoto, Yukiteru; Haino, Takeharu
• Is Part Of: Angewandte Chemie. Volume 127:Number 49(2015)
• Page Start: 15043
• Page End: 15047
• Publication Date: 2015-10-21
• Subjects: Gele -- Molekulare Erkennung -- Porphyrine -- Rheologie -- Supramolekulare Polymere; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201508475
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Bisporphyrin cleft molecule 1 Zn possessing a guest moiety assembled to form supramolecular polymers through host–guest interactions. Bispyridine cross‐linkers created interchain connections among the supramolecular polymers to form networked polymers in solution. Solution viscometry confirmed that the cross‐linked supramolecular polymers were highly entangled. Frequency‐dependent linear viscoelastic spectroscopy revealed that the supramolecular polymers generated well‐entangled solutions with associating and networking polymers, whereas the solid‐like aggregates moved individually without breaking and reforming structures below the transition temperature of 9.6 °C. Morphological transition of the supramolecular polymers was evidenced by AFM images; the non‐cross‐linked polymer resulted in wide‐spread thin networks, while the cross‐linked networks produced thicker worm‐like nanostructures. The supramolecular networks gelled in 1, 1, 2, 2‐tetrachloroethane, and an elastic free‐standing film was fabricated with a Young's modulus of 1 GPa. Abstract : Eine Zinkbisporphyrin‐Klammer mit anhängendem Gastmotiv organisiert sich zu einem supramolekularen Polymer, das durch Koordination eines Dipyridins vernetzt werden kann. Die vernetzten Polymere bildeten einen freistehenden Film mit einem Young‐Modul von 1 GPa.