研究目的
To demonstrate that Double-Electron-Electron-Resonance (DEER) spectroscopy can reveal the chain length distribution, and chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura Coupling Polymerization (cSMCP).
研究成果
DEER spectroscopy allows for the quantification of the individual n-mer populations and their respective conformations and flexibilities directly on mixtures. The method also enables characterization of conformation and flexibility inside nanoparticles.
研究不足
The necessity of spin-labeled oligomers is a limitation of the analysis method. The method is complementary rather than competitive to established standard methods for chain length distribution and conformation analysis.
1：Experimental Design and Method Selection:
DEER spectroscopy was used to determine distance distributions between paramagnetic centers (TEMPO groups) at the chain ends of oligofluorenes.
2：Sample Selection and Data Sources:
Doubly labeled precise oligomers were synthesized stepwise as reference materials. Oligomer mixtures were obtained from controlled Suzuki-Miyaura polymerization.
3：List of Experimental Equipment and Materials:
TEMPO-substituted initiator and chain terminating agent, chloro[(tri-tert-butylphosphine)-2-(amino-biphenyl)]palladium(II) as Pd(0) source.
4：Experimental Procedures and Operational Workflow:
Spin labels were attached during polymerization. DEER measurements were performed in Q-band for precise oligomers and oligomer mixtures.
5：Data Analysis Methods:
Distance distributions were analyzed using the worm-like chain model (WLC) with DEERAnalysis software.
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