Abstract
Two isomer polymers, P3 and P6, with fully conjugated ladder structures are presented by simple synthetic routes. The well-defined structures of fully conjugated ladder polymers P3 and P6 were ensured by the high yields of every reaction step. The fully rigid ladder structures were confirmed by nuclear magnetic resonance (NMR), fourier transform infrared spectroscopy (FTIR), and photophysical test. Polymers P3 and P6 with bulky alkyl side chains exhibit good solution processability and desirable thermostable properties. After the intramolecular cyclization reaction, the band gaps of polymers P3 and P6 become lower (2.86 eV and 2.66 eV, respectively) compared with polymers P1 and P4. This initial study provides insight for the rational design of fully ladder-conjugated isomeric polymers with well-defined structures.
Highlights
Conjugated ladder polymers have drawn extensive attention because of their rigid structure with π-conjugated systems [1–6]
The main purpose of this paper is to provide an insight for synthesizing defect-free conjugated ladder polymers (cLPs)
The structure of the product was identified by nuclear magnetic resonance (NMR) spectrum, MALDI-TOF, and fourier transform infrared spectroscopy (FTIR), and only one product, compound S1, was observed
Summary
Conjugated ladder polymers (cLPs) have drawn extensive attention because of their rigid structure with π-conjugated systems [1–6]. Researchers have introduced different heteroatoms [8,22–26], such as N, B, S, P, and Si, to the fused π-conjugated structure. This can effectively regulate the structure with desirable physical and chemical properties. The integration of the B-N fragment into the fused π-conjugated ladder system may be a useful strategy to construct new cLPs. Wu’s group [21,35–37] has conducted extensive work of this type. Wu’s group [21,35–37] has conducted extensive work of this type They once used the above strategy to synthesize a fused π-conjugated ladder compound and polymer [35]; the polymer exhibited good solution and thermal properties, with a UV-vis absorption peak at 455 nm; after the BN-embedded cyclization, the fused ladder-conjugated polymer presented a lower band gap
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