NDLI: Chiroptical generation and amplification of hyperbranched π-conjugated polymers in aggregation states driven by limonene chirality

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Jiangfei Zhang, Jian Li, Liang Zhang, Wei Zhou, Nianchen Zhang, Shuangshuang Fujiki, Michiya Suzuki, Nozomu Wang, Laibing Zhu, Xiulin
Copyright Year	2014
Abstract	In this contribution, a series of hyperbranched π-conjugated poly(9,9-di-n-octylfluorene)s (HPF8s) with hexaoctyltruxene (HT) as branching units were successfully prepared by a Suzuki polycondensation reaction. We present the first generation of optically active HPF8s in aggregation states with strong circular dichroism (CD) and circularly polarised luminescence (CPL) properties. The optically active aggregates of HPF8s were efficiently produced by CD-/CPL-silent HPF8s with the help of solvent chirality transfer from chiral limonene at room temperature. The emergence of CD and CPL signals of HPF8s aggregates results from the weak forces (π/π, van der Waals, CH/π and OH/π interactions) in a tersolvent system of chloroform (a good solvent), alkanol (a poor solvent), and (R)-(+)-/(S)-(−)-limonene (1R/1S, a chiral source). The hyperbranched polymer structure (degree of branching), poor solvent type, volume fraction of methanol and 1R/1S, limonene enantiopurity and polymer concentration have obvious effects on the magnitude and sign of the CD signals. The obtained HPF8s aggregates have relatively strong UV-vis absorption and CD signals in the range of 300–500 nm as well as CPL emission (420–460 nm) under optimised conditions. The current study will open up a new avenue for efficiently producing ambidextrous chiroptical hyperbranched polymeric materials without any specific chiral catalysts or substituents under mild conditions.
Starting Page	784
Ending Page	791
Page Count	8
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	5
Issue Number	3
Journal	Polymer Chemistry
DOI	10.1039/c3py01037f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	van der Waals Chloroform Luminescence Alcohol Polymer Van der Waals force Circular dichroism Chirality Enantiomer Optical rotation Limonene Solvent CPL Suzuki reaction Methanol
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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