journal article·2017-09-07

Hereditary Character of Alkyl-Chain Length Effect on β-Phase Conformation from Polydialkylfluorenes to Bulky Polydiarylfluorenes

Bin Liu, Jinyi Lin, Mengna Yu, Bin Li, Linghai Xie, Changjin Ou, Feng Liu, Tao Li, Dan Lu, Wei Huang

The Journal of Physical Chemistry C· Volume 121· Issue 35
Publisher page

Abstract

Although alkyl chain engineering provides an effective tool for regulation of polymorphic behaviors of conjugated polymers, there is no report on extracting universal rule from complicated structure–property relationships among various molecule systems. Here, a series of bulky polydiarylfluorenes with incremental length of n -alkyl chains (P n DPF, n = 6, 7, 8, 9) was investigated, examining conformation, gelation and crystallinity behavior. By analyzing the UV – vis absorbance and photoluminescence (PL) spectra of P n DPF from single chains to the aggregate state, β-phase was found in P7DPF and P8DPF. P8DPF adopted the largest torsional angle inferring from the degree of red-shift in PL and Raman spectra. By thermal annealing at 220 °C, crystallization process was observed in these four polymers, but β-phase only appeared in P7DPF and P8DPF. Finally, both thermodynamic and kinetic paths were used to illustrate the mechanism of β-phase formation for P n DPF. Our results suggested that the alkyl-chain length effect on P n DPF exhibited the characters inheriting from the corresponding polydialkylfluorenes (PF n, n = 6, 7, 8, 9). By comparative study between P n DPF and PF n, an explicit relationship between the side-chain length and polymorphic behaviors is established for the first time in bulky polymer semiconductors.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials · Fullerene Chemistry and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Molecular Systems and Organic Devices (CMSOD), Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China

Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China

Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai 200240, China

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, China

Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China

Funding

China Postdoctoral Science Foundation · National Natural Science Foundation of China · Jiangsu Planned Projects for Postdoctoral Research Funds · Six Peak Talents Foundation of Jiangsu Province · Natural Science of the Education Committee of Jiangsu Province · Doctoral Fund of Ministry of Education of China

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