Journal
CHEMICAL SCIENCE
Volume 7, Issue 2, Pages 881-889Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc02385h
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Funding
- National Priorities Research Program award from the Qatar National Research Fund [NPRP7-285-1-045]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The synthesis of a carbazole-derived, well-defined ladder polymer was achieved under thermodynamic control by employing reversible ring-closing olefin metathesis. This unique approach featured mild conditions and excellent efficiency, affording the ladder polymer backbone with minimum levels of unreacted defects. Rigorous NMR analysis on a C-13 isotope-enriched product revealed that the main-chain contained less than 1% of unreacted precursory vinyl groups. The rigid conformation of the ladder-type backbone was confirmed by photophysical analysis, while the extended rod-like structure was visualized under scanning tunneling microscope. Excellent solubility of this polymer in common organic solvents allowed for feasible processing of thin films using solution-casting techniques. Atomic force microscopy and grazing incident X-ray scattering revealed a uniform and amorphous morphology of these films, in sharp contrast to the polycrystalline thin films of its small molecular counterpart.
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