Citation: Wu Yunying, Gou Gaozhang, Wu Xianxue, Yang Lijun, Fu Wenfu. Synthesis and Spectroscopic Properties of N, O-Chelated Pyridine-BF₂ Complexes[J]. Chinese Journal of Organic Chemistry, ;2017, 37(3): 704-710. doi: 10.6023/cjoc201607013 shu

Synthesis and Spectroscopic Properties of N, O-Chelated Pyridine-BF₂ Complexes

Wu Yunying ^a ,
Gou Gaozhang ^c ,
Wu Xianxue ^a ,
Yang Lijun ^a ,
Fu Wenfu ^b,*,,

a.
College of Resources and Environment, School of Yuxi Normal University, Yuxi 653100
b.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
c.
College of Science, School of Honghe University, Mengzi 661199

Corresponding author: Fu Wenfu, wuyy@yxnu.net
Received Date: 8 July 2016
Revised Date: 30 September 2016

Fund Project: the Youth Project of Science and Technology Department of Yunnan Province 2014FD50the General Program of Yunnan Provincial Education Department 2015Y455

Figures(4)

The six novel N, O-chelated pyridine-BF₂ complexes (2a~2f) were successfully obtained by a facile two-step synthesis from 2-amino-pyridine derivatives. All compounds synthesized were fully characterized by ¹H NMR, ¹³C NMR, ¹⁹F NMR, IR, ESI-MS and X-ray diffraction analysis. It was found that complexes 2b, 2c, 2e and 2f, in which electron-donating groups were substituted on p-positions of the phenyl ring (or 6-positions of the pyridine ring) exhibit a structured absorption at 360~420 nm (λ_abs=368, 400, 365, 418 nm) with a large extinction coefficient, such as 28760, 51980, 25250, 40750 L·mol^-1·cm^-1, respectively. In sharp contrast, the complexes 2a and 2d with a relatively neutral group (H for 2a) or an electron-withdrawing group (COOMe for 2d) on the p-position of the phenyl ring gave the absorption (λ_abs) blue shifted to 340 and 337 nm. Meanwhile, the intramolecular charge transfer (ICT) could be detected for complexes 2b, 2c, 2e and 2f, whose emission bands bathochromic shift significantly and emission intensities decreased with increasing the solvent polarities. Additionally, similar to most boron-dipyrromethene derivatives (BODIPYs) and their derivatives, this pyridine-BF₂ complex exhibited faint photoluminescence in the solid state. In order to better illustrate intramolecular charge transfer in 2b, 2c, 2e and 2f, theoretical calculations were carried out. Therefore, these experimental facts and theoretical calculations support our proposed ICT mechanism in the novel boron fluoride complexes 2b, 2c, 2e and 2f, and reveal that substituent groups have a significant in-fluence on optical properties. The investigations of novel pyridine-BF₂ complexes will provide favorable foundation and theo-retical support for the further development of ICT-based fluorescent dyes and their applications.
- N, O-chelated,
- pyridine,
- fluorine-boron compound,
- ICT,
- spectroscopic properties
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Synthesis and Spectroscopic Properties of N, O-Chelated Pyridine-BF2 Complexes

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Spectroscopic Properties of N, O-Chelated Pyridine-BF₂ Complexes