有机化学    

研究论文

二氟化硼β-二酮类近红外荧光染料的设计合成及细胞成像研究

齐云鹏*,a, 刘伟a, 王俊龙a, 杜涛a, 矫淞霖a   

  1. a伊犁师范大学化学化工学院 新疆普通高等学校天然产物化学与应用重点实验室 新疆生物质资源清洁转化与高值利用重点实验室 新疆 伊宁 835000
  • 收稿日期:2024-04-22 修回日期:2024-06-01
  • 基金资助:
    新疆维吾尔自治区自然科学基金((No. 2022D01C338)资助项目、伊犁师范大学科研项目((No. 2022HJYB05).

Design and Synthesis of Near-infrared Fluorescent Dyes of Difluoroboron β-diketonate and Cell Imaging

Qi Yunpeng*,a, Liu Weia, Wang Junlonga, Du Taoa, Jiao Songlina   

  1. aSchool of Chemistry and Chemical Engineering, University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources, Yili Normal University, Yining 835000, China
  • Received:2024-04-22 Revised:2024-06-01
  • Contact: *E-mail:17988326@ylnu.edu.cn
  • Supported by:
    Natural Science Foundation of Xinjiang Uygur Autonomous Region (No. 2022D01C338), Scientific Research Project of Yili Normal University (No. 2022HJYB05).

近红外(NIR)发光材料因具有生物组织穿透力强和光散射弱的独特优势在生物成像领域具有广泛应用的潜力. 本文通过增强分子内电荷转移策略设计合成了具有供体-受体(D-A)结构的二氟化硼β-二酮配合物(TPA-BF2-CN). 该配合物具有溶剂依赖发光特性. 在稀溶液和固态下均具有较好的发光效率, 分别为11.1%和5.9%, 荧光发射波长最大峰值可达760 nm, 处于NIR范围. 该配合物具有力致荧光变色性质, 研磨前后发射波长可红移107 nm. TPA-BF2-CN还表现出双发射荧光现象, 两个发射峰分别位于400 nm的蓝光区和760 nm的NIR区, 其中NIR区的起止发射波长范围为690-850 nm. 相比于单通道荧光分子更具有避免环境因素干扰的优势. 细胞成像研究表明, TPA-BF2-CN对HeLa细胞相容性良好, 并且在整个HeLa细胞质区域中可观察到近红外发射信号. 因此, TPA-BF2-CN可作为一种活细胞成像荧光剂.

关键词: 二氟化硼β-二酮, 近红外, 细胞成像, 力致变色, 双态发射

Near-infrared (NIR) luminescent materials have great potential in the field of bioimaging due to their unique advantages of strong tissue penetration and weak light scattering in biological tissues. In this study, a donor-acceptor (D-A) structured boron difluoride β-diketonate complex (TPA-BF2-CN) was designed and synthesized through the strategy of enhancing intramolecular charge transfer. This complex exhibits solvent-dependent luminescent properties. It demonstrates good luminescence efficiency in dilute solution and solid state, with efficiencies of 11.1% and 5.9% respectively. The maximum emission wavelength peaks at 760 nm, falling within the NIR range. The complex also possesses mechanochromic properties, with a redshift of emission wavelength by 107 nm after grinding. TPA-BF2-CN exhibits dual emission fluorescence phenomenon, with emission peaks located in the blue light region at 400 nm and the NIR region at 760 nm, with an emission wavelength range of 690-850 nm in the NIR region. Compared to single-channel fluorescent molecules, it has the advantage of avoiding interference from environmental factors. Cell imaging studies demonstrate good compatibility of TPA-BF2-CN with HeLa cells, and NIR emission signals can be observed throughout the cytoplasmic region of HeLa cells. Therefore, TPA-BF2-CN can serve as a fluorescent probe for live cell imaging.

Key words: difluoroboron β-diketonate, near-infrared, cell imaging, mechanochromic, dual-state emission