Supramolecular Porphyrin Copolymer Assembled through Host–Guest Interactions and Metal–Ligand Coordination. Issue 49 (21st October 2015)

• Record Type: Journal Article
• Authors: Kinjo, Kanashi; Hirao, Takehiro; Kihara, Shin‐ichi; Katsumoto, Yukiteru; Haino, Takeharu
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 49(2015)
• Page Start: 14830
• Page End: 14834
• Publication Date: 2015-10-21
• Subjects: gels -- molecular recognition -- porphyrins -- rheology -- supramolecular polymers; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201508475
• Languages: English
• ISSNs: 1433-7851

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 : A zinc bisporphyrin cleft molecule possessing a guest moiety assembled through host‐guest interactions to form supramolecular porphyrin polymers that were cross‐linked by bispyridine‐coordination. The resulting cross‐linked polymers were entangled in solution, and a free‐standing film was fabricated with a Young's modulus of 1 GPa.