Four BODIPY dyes (6a–6d) with electron-donating or electron-withdrawing groups at the meso-position were synthesized by the Sonogashira coupling reaction of 2,5-diethynylthieno[3,2-b]thiophene with mono-iodo-BODIPY moieties. All compounds were fully characterized by ¹H NMR and MALDI-TOF MS. Their photophysical and electrochemical properties were studied by UV-visible absorption spectroscopy, steady-state and time-resolved fluorescence spectroscopy, two-photon excitation spectroscopy and cyclic voltammetry. These conjugated dyes exhibit interesting photophysical properties such as a high molar extinction coefficient, large Stokes shift and high two-photon absorption cross section σ₂.

中文翻译：

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噻吩[3,2-b]噻吩基桥式 BODIPY 二聚体：合成、电化学以及单光子和双光子光物理性质


通过 2,5-二乙基噻吩[3,2-b]噻吩与一碘-BODIPY 部分的 Sonogashira 偶联反应合成了四种在介观位置具有供电子或吸电子基团的 BODIPY 染料 （6a–6d）。所有化合物均通过 ¹H NMR 和 MALDI-TOF MS 进行充分表征。通过紫外-可见吸收光谱、稳态和时间分辨荧光光谱、双光子激发光谱和循环伏安法研究了它们的光物理和电化学性质。这些偶联染料表现出有趣的光物理特性，例如高摩尔消光系数、大斯托克斯位移和高双光子吸收截面 _{σ 2}。