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Synlett 2013; 24(12): 1505-1508
DOI: 10.1055/s-0033-1339177
DOI: 10.1055/s-0033-1339177
letter
Synthesis and Characterization of 2-Alkylbenzotriazole-Based Donor-π-Acceptor-Type Copolymers
Further Information
Publication History
Received: 03 April 2013
Accepted after revision: 08 May 2013
Publication Date:
14 June 2013 (online)
Abstract
Four donor-π-acceptor-type copolymers were synthesized via palladium-catalyzed Sonogashira coupling reaction. The resulting donor-π-acceptor-conjugated copolymers can show fluorescence emission in the range of λ = 473–568 nm, and the band gaps of the alternating polymers can be tuned in the range 3.09–3.74 eV by using four different donors.
Supporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synlett.
- Supporting Information
-
References and Notes
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Synthesis Procedures for the BTA-Based Conjugated Polymers
Synthesis of P1 To a 100 mL Schlenk flask, M-1 (0.14 g, 0.05 mmol), M2 (0.31 g, 0.05 mmol), Pd(PPh3)4 (2.9 mg, 0.03 mmol), and CuI (0. 5 mg, 0.003 mmol) were added in 10 mL THF and Et3N (6 mL) under N2 atmosphere. The mixture was stirred at 90 °C for 2 d. The solvent was evaporated under vacuum after the mixture was cooled to r.t. The residue was dissolved and in CH2Cl2 (100 mL) and filtered; the filtrate was then concentrated and added to MeOH to precipitate the polymer. The polymer was dried in vacuum to give 210 mg of product in 58% yield. GPC results: M w = 17240, M n = 10740, PDI = 1.54. 1H NMR (300 MHz, CDCl3): δ = 7.24–7.21 (m, 6 H), 6.69–6.66 (m, 2 H), 3.77–3.76 (m, 4 H), 1.75–0.85 (m, 50 H). Anal. Calcd for (C48H64N4S)n: C, 78.85; H, 9.10; N, 7.66; S, 4.39. Found: C, 78.23; H, 9.16; N, 7.84; S, 4.27. Synthesis of P2 P2 was synthesized from monomers M-1 and M-3 in 70% yield by following in the same procedure used for the preparation of P1. GPC results: M w = 17240, M n = 10050, PDI = 1.72. 1H NMR (300 MHz, CDCl3): δ = 8.45–7.23 (m, 1 H), 8.21–8.19 (m, 2 H), 7.78–7.16 (m, 5 H), 4.80–4.76 (m, 2 H), 4.20–4.06 (m, 2 H), 1.21–0.85 (m, 50 H). Anal. Calcd for (C48H62N4O2S)n: C, 75.55; H, 8.72; N, 7.34; S, 4.20. Found: C, 75.64; H, 8.63; N, 7.17; S, 4.28. Synthesis of P3 P3 was synthesized from monomers M1 and M4 in 73%yield by following the same procedure used for the preparation of P1. GPC results: M w = 15780, M n = 12850, PDI = 1.23. 1H NMR (300 MHz, CDCl3): δ = 7.80–8.53 (m, 2 H), 7.40–7.28 (m, 2 H), 7.12–6.81 (m, 6 H), 5.21–4.79 (br, 2 H), 3.83–3.81 (br, 2 H), 2.16–0.84 (m, 50 H). Anal. Calcd for: (C56H68N4S3)n: C, 75.29; H, 7.67; N, 6.27; S, 10.77. Found: C, 75.18; H, 7.76; N, 6.12; S, 10.95. Synthesis of P4 P4 was synthesized from monomers M1 and M5 in 73% yield by following the same procedure used for the preparation of P1. GPC results: M w = 17910, M n = 10080, PDI = 1.78. 1H NMR (300 MHz, CDCl3): δ = 8.34–8.32 (m, 2 H), 7.84–7.83 (m, 2 H), 7.60–6.31 (m, 8 H), 4.80–4.82 (br, 2 H), 4.18–4.17 (br, 2 H), 2.26–0.59 (m, 50 H). Anal. Calcd for (C56H66N4O2S3)n: C, 72.69; H, 7.41; N, 6.05; O, 3.46; S, 10.40. Found: C, 72.76; H, 7.36; N, 6.01; O, 3.49; S, 10.37.