- Influence of Donor-Acceptor Conjugation Between Thiophene-Phthalazinone Structures Containing Sp(3) C-N Bond on the Frontier Orbital Levels and Optic-Electronic Properties
- 点击次数：
- 论文类型： 期刊论文
- 发表时间： 2016-11-01
- 发表刊物： JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
- 收录刊物： SCIE、EI、Scopus
- 卷号： 54
- 期号： 21
- 页面范围： 3470-3483
- ISSN号： 0887-624X
- 关键字： classical aromatic nucleophilic displacement polymerization; phthalazinone; thiophene; UV-vis spectroscopy; thermal properties; structure-property relations
- 摘要： Herein, an electron-deficient phthalazinone unit containing a unique Sp(3) hybrid nitrogen atom as an acceptor to cut off the ether bond was presented and three Donor-Acceptor (D-A) conjugated fluoropolymers via Classical Aromatic Nucleophilic Displacement Polymerization (CANDP) method were successfully synthesized. These polymers exhibit excellent thermostability. The 5% weight loss temperature of PDT2TF under nitrogen atmosphere is high, up to 470 degrees C. This is due to that the D-A conjugation between thiophenephthalazinone units affects its resonance energy and stabilizes the thiophene-phthalazinone structures. These three fluoropolymers show strong absorptions and fluorescence in visible light region both in solution and thin film states. The band gaps (E-g) of these polymers are narrower than that of their corresponding di-NH capped monomers, owing to the good electronic communication properties of the Sp(3) nitrogen atom in the phthalazinone unit. The E-g value of PDT3TF is decreased to 2.03 eV. These results indicate that phthalazinone unit is an efficient acceptor and could exhibit strong D-A effect with thiophene unit. Also, the Sp(3) nitrogen atom in the phthalazinone shows good electronic wave function and charge transport properties. This facile CANDP synthetic method combined with Sp(3) C-N bond linked electron-deficient phthalazinone unit affords polymers with controllable photoelectric properties. (C) 2016 Wiley Periodicals, Inc.
