1. Synthesis and Solution Processing of a Hydrogen-Bonded Ladder Polymer
Yang Zou, Xiaozhou Ji, Jizhe Cai, Tianyu Yuan, Daniel J. Stanton, Yen-Hao Lin, Mohammad Naraghi, Lei Fang 
Chem 
Volume 2, Issue 1, Pages (January 2017)
DOI: /j.chempr
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2. Chem 2017 2, DOI: ( /j.chempr )
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3. Figure 1 Structural Formula
(A) Structural formula of quinacridone, IQA, and PIQA. The two starting materials for PIQA are 2,7-diaminofluorene and DMSS.
(B) Structural formula of Boc-functionalized IQA and PIQA: BocIQA and BocPIQA, respectively.
Chem 2017 2, DOI: ( /j.chempr )
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4. Figure 2 NMR Spectra and Signal Assignment of BocIQA and BocPIQA
(A) HMBC spectrum of BocIQA.
(B) 13C-NMR spectra and 13C signal assignment of BocIQA.
(C) 13C-NMR spectra and 13C signal assignment of BocPIQA.
Chem 2017 2, DOI: ( /j.chempr )
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5. Figure 3 Thermal Cleavage of Boc Groups
(A) Schematic representation of Boc cleavage of BocPIQA by thermal annealing in the solid state, including regeneration of PIQA with intermolecular hydrogen bonds.
(B) TGA curves of PIQA and BocPIQA show key weight losses and carbonizations yields at 800°C.
(C) FT-IR spectra of PIQA and BocPIQA before and after thermal annealing.
Chem 2017 2, DOI: ( /j.chempr )
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6. Figure 4 Characterization Data of BocPIQA and PIQA Thin Films
(A) AFM height-profile images of a BocPIQA thin film on silicon wafer before (left) and after (right) thermal annealing.
(B) (Left) A photograph of the result after the as-cast thin film was soaked on a glass slide in chlorobenzene shows complete dissolution of the thin film. (Right) The result of soaking an annealed thin-film sample in chlorobenzene shows solvent resistance.
(C) GIXD of the as-cast thin film (blue) in comparison with that of the annealed thin film (red).
Chem 2017 2, DOI: ( /j.chempr )
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7. Figure 5 Solvent-Resistance Test of PIQA Thin Film
Thickness of annealed BocPIQA film after soaking in different solvents for 30 min. The red bars represent boiling solvents or solutions, and the blue bars represent treatment at room temperature. Error bars represent standard deviations of multiple measurements over different areas of the film.
Chem 2017 2, DOI: ( /j.chempr )
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8. Scheme 1
Synthetic Route of the Quinacridone-Derived Ladder Polymer PIQA and Its Boc-Protected Derivative BocPIQA
Chem 2017 2, DOI: ( /j.chempr )
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