Synthesis and properties of through-space conjugated polymers based on π-π stacked 1,3-biarylpropane tethering units

• Published in: Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2013-08, Vol.51 (16), p.3412-3419
• Main Authors: Nomura, Ryosuke, Moriai, Ryota, Kudo, Masaru, Hoshino, Tohru, Watanabe, Jun-ichi, Funyu, Shigeaki, Ishitsuka, Ken-ich, Okamoto, Sentaro
• Format: Article
• Language: English
• Subjects: Absorption spectra; Applied sciences; conformational analysis; conjugated polymers; Emission; Exact sciences and technology; Excitation; fluorescence; Grounds; Organic polymers; Physicochemistry of polymers; Polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Stacking; Substructures; Tethering; UV-vis spectroscopy
• ISSN: 0887-624X; 1099-0518
• DOI: 10.1002/pola.26738

ABSTRACT Novel skipped‐π polymers in which the π‐components are connected with 2‐substituted trimethylene tethering units exhibit bathochromically shifted, broadened ultraviolet absorption with a unique lower‐energy absorption band and a largely red‐shifted fluorescent emission. These results suggest that through‐space π–π interactions owing to a stair‐like stacking substructure in these polymers extend the π‐conjugation of the components in the ground and excited states. As the photophysical properties of the polymers observed both in a solution and in a dried film are similar to those of the J‐aggregates of π‐molecules, these polymers may be considered as pseudo J‐stacking (or J‐like‐stacking) polymers. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3412–3419 Novel skipped‐π polymers comprising π‐components connected with 2‐substituted trimethylene tethering units that exist as stair‐like stacking substructures were synthesized and found to exhibit bathochromically shifted, broadened UV absorption with a unique lower‐energy absorption band and largely red‐shifted fluorescent emission owing to the extended π‐conjugation resulting from through‐space π–π interactions in the ground and excited states.