Liquid crystalline supramolecular crosslinked polymer complexes of ditopic rylenebisimides and P4VP. Issue 6 (15th March 2017)

• Record Type: Journal Article
• Authors: Saibal, B.; Narayan, Rekha; Chithiravel, S.; Asha, S. K.
• Is Part Of: Journal of polymer science. Volume 55:Issue 6(2017)
• Page Start: 951
• Page End: 959
• Publication Date: 2017-03-15
• Subjects: crystal structures -- ditopic rylenebisimide -- hydrogen bonding -- lyotropic liquid crystal -- P4VP -- self-assembly -- supramolecular crosslink -- supramolecular structures; 547
• DOI: 10.1002/pola.28449
• Languages: English
• ISSNs: 0887-624X

Abstract

ABSTRACT: Perylenebisimide and naphthalenebisimide (PBI‐PDP and NBI‐PDP) end functionalized with pentadecyl phenol is designed as ditopic hydrogen bonding acceptors to form supramolecular crosslinked network with poly(4‐vinyl pyridine) (P4VP). The pristine PBI‐PDP has been grown as single crystals from DCM‐MeOH (dichloromethane‐methanol) mixture at room temperature, which revealed a P21 space group. Noticeably, the pentadecyl alkyl chain shields the aromatic perylene core on both sides resulting in the absence of π–π interaction in single‐crystal assembly. The naphthalenebisimide derivative exhibits thermotropic liquid crystalline behavior, while both the molecules exhibits lyotropic liquid crystalline phases in tetrahydrofuran (THF), which were characterized using a combination of differential scanning calorimeter, X‐ray diffraction, and polarized light microscopy. The hydrogen‐bonded complex of both the rylenebisimides with P4VP preserves the mesomorphic properties in THF. The electron transport mobility measured by space charge limited current measurements reveals a two orders of magnitude increase in the charge transport in the P4VP complex compared to that of the pristine molecule. The average electron mobility obtained is μ e, avg : 10 −3 cm 2 /Vs for P4VP‐PBI compared to μ e, avg : 10 −5 cm 2 /Vs for pristine PBI derivative. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2017, 55, 951–959 Abstract : A liquid crystalline supramolecular crosslinked polymer network was made with improved charge carrier mobility. This supramolecular crosslinked polymer network was formed by hydrogen bonding interaction of symmetric perylenebisimide and naphthalenebisimide with poly(4‐vinyl pyridine). Space charge limited current measurements showed a two orders of magnitude increase in electron mobility in the order of 10 −3 cm 2 /Vs in the supramolecular polymer complex compared to the pristine molecule.