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The novel boron-chelated π-conjugated polymers named as BF2-poly and BPh2-poly were synthesized by a feasible condensation-chelation strategy. First, conjugated polymers bearing Boc group were prepared by using palladium-catalyzed Suzuki-Miyaura coupling reaction. Then, conjugated polymers (poly-1) were obtained with high efficiency by removing the...
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... elution curves and GPC Data for obtained polymers were shown in Figure 1 and Table 1, respectively. The M n and M w / M n of Boc-poly were determined as 1.41 × 10 4 Da and 3.17, respectively. Poly-1 exhibited a lower molecular weight ( M n = 1.03 × 10 4 Da) and a narrower distribution The signals in the H NMR spectra of the polymers can be classified into two groups (shown in Figures S4–S7): the signals that emerged at 7.3–8.3 ppm can be attributed to the aromatic protons; and the peaks ranging from 0.5 to 2.5 ppm can be assigned to the hydrogen atoms in alkyl groups. It is worth noting that the distinct signal at 1.29 ppm in the 1 H NMR spectrum of Boc-poly represents the hydrogen in Boc groups (shown in Figure S4). The disappearance of the peak at 1.29 ppm in the 1 H NMR spectrum of poly-1 suggested that the deprotection reaction was completed (shown in Figure S5). The 1 H NMR spectrum of BF 2 -poly showed a similar tendency to that of poly1 (shown in Figure S6). However, compared to those of poly-1 and BF 2 -poly , the integral of the aromatic protons in BPh 2 -poly increased more than double, which coincided with expected structures (shown in Figure S7). The 13 C NMR spectra of BF 2 -poly and BPh 2 -poly were illustrated in Figures S8 and S9, respectively. The FT-IR spectra of the polymers were shown in Figure 2. Boc-poly displayed a characteristic absorption band around 1768 cm − 1 in FT-IR spectrogram, which can be attributed to the C=O stretching in Boc groups. After deprotection, the disappearance of the C=O stretching in FT-IR spectrogram of poly-1 also suggested that the deprotection reaction was completed. Meanwhile, FT-IR analysis showed that poly-1 contained –OH group (3307 cm − 1 ), which can be assigned to the hydroxyl group coming from 2,2'-pyridoin-based ligand. The FT-IR spectra of BF 2 -poly and BPh 2 -poly showed the disappearance of –OH group, suggesting the chelating reactions were completed. The XRD patterns of BF 2 -poly and BPh 2 -poly are shown in Figure 3. The samples displayed no distinct peaks from 10° to 90°, suggesting the polymers existed in an amorphous form rather than ...
