The 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene fluorescent dyes (BODIPYs) were first synthesized almost 50 years ago; however, the exploration of their technological application has only begun in the last 20 years. These dyes possess interesting photophysical properties, increasing interest in their application as fluorescent markers and/or dyes. Herein, we report the synthesis of tetramethyl BODIPY and four meso-substituted dyes (2-thienyl, 4-pyridinyl, 4-fluorophenyl and 4-nitrophenyl derivatives). Their photophysical characterization (absorption spectra, emission spectra, fluorescence quantum yields and time-resolved fluorescence) and solvatochromic behavior were studied. Absorption and emission were barely affected by substituents, with a slightly higher stokes shift observed in the substituted dyes. Substitutions could be associated with a shorter fluorescence lifetime and lower quantum yields. Good correlations were observed between the Catalán solvent descriptors and the photophysical parameters. Also, better correlation was observed between the solvent polarizability descriptor (SP) and photophysical parameters. Overall, only slight solvatochromism was observed. The 4-pyridinyl derivative was the subject of a relatively significant solvatochromism regarding the wavelengths of the emission spectra, with the observation of a bathochromically shifted emission in methanol. The fluorescence quantum yield of the 4-nitrophenyl substituted BODIPY was approximately 30 times higher in hexane, which may be of interest for practical applications.
                                    4,4-二
氟-4-
硼-3a,4a-二氮-s-
吲哚荧光
染料(BODIPYs)首次合成于近50年前;然而,其技术应用的探索仅在过去20年中开始。这些
染料具有有趣的光物理特性,因而对其作为荧光标记物和/或
染料的应用产生了越来越大的兴趣。在此,我们报告了四甲基BODIPY及四种中间体取代
染料(2-
噻吩基、4-
吡啶基、4-
氟苯基和4-
硝基苯基衍
生物)的合成。对它们的光物理特性(吸收光谱、发射光谱、荧光量子产率和时间分辨荧光)以及溶剂色谱行为进行了研究。吸收和发射几乎不受取代基的影响,在取代
染料中观察到稍高的斯托克斯位移。取代基与较短的荧光寿命和较低的量子产率相关联。观察到Catalán溶剂描述符与光物理参数之间的良好相关性。同时,溶剂极化率描述符(
SP)与光物理参数之间的相关性更好。总体而言,仅观察到轻微的溶剂色谱现象。4-
吡啶基衍
生物在发射光谱波长方面表现出相对显著的溶剂色谱现象,在
甲醇中观察到了红移的发射。4-
硝基苯取代的BODIPY在己烷中的荧光量子产率约高出30倍,这可能对实际应用具有兴趣。