【作者】 张大奎；

【导师】 肖义；

【作者基本信息】 大连理工大学 ， 精细化工， 2010， 博士

【摘要】 有机发光材料由于种类繁多、性质多样、应用广泛成为近年来的研究热点。从传统的光致发光领域到新兴的电致发光领域的研究及应用中,有机发光材料无不发挥着重要的作用。BODIPY(氟化硼络合二吡咯甲川类)荧光染料由于其独特的光化学光物理性质引起了人们的广泛关注,成为近十几年研究的热点。本论文选择BODIPY为母体,设计合成了一系列新的荧光化合物,并且标识了化合物的结构,测定了其光化学光物理性质。根据结构特征分别研究开发他们在荧光探针领域及功能光电材料领域(电致发光材料、双光子活性材料和激光染料)的应用。1.在氟硼吡咯的β位通过Suzuki偶联反应引入共轭基团,改变其光谱性质。其中化合物6a和6b是两个基于光诱导电子转移机理的对氢质子敏感的分子,对其进行了酸滴定实验,通过晶体和电化学性质的研究,证实了电子转移过程的存在。化合物7和8是由双键共轭连接的,最大吸收和荧光发射都大大明显红移,斯托克斯位移增大到80 nm以上。2.在氟硼吡咯的β位通过Sonogashira偶联反应引入共轭基团,得到4个新型荧光化合物。化合物T2作为最简单的共轭结构被用作参比化合物,对其它化合物的结构与光谱性质关系进行系统的研究。其中化合物T3和T4是两个D-π-D型双光子吸收活性分子,对其线形及非线性光学性质都进行了测定,其双光子激发荧光波长均达到650 nm以上,并进行了活细胞内荧光成像,显示出无毒性和很好的细胞穿透性。说明这两个荧光化合物在生物体信息传递领域有一定应用潜质。化合物T5结构中引入了大空间位阻基团,增加了斯托克斯位移,有效地减少了分子间的π-π堆积作用,抑制了荧光自淬灭现象,并对其电致发光及器件的光学性质进行了初步的研究。3.在氟硼吡咯的α位通过Knoevenagel缩合反应,合成了系列化合物K1-K8。对其中的K1-K5进行了详细的对比研究,发现将延展共轭体系和调节电荷转移作用这两种方法结合起来,得到的含有咔唑基团的染料K5具有较长发射波长、较大摩尔消光系数、很窄的光谱和较高的荧光量子产率等优秀性质,不仅具有激光性能而且也可以应用在生物荧光成像方面,是一个集多种功能于一体的荧光团。K6和K7是我们设计的一对红色激光染料,通过对激光效率、光稳定性等方面的测试,证明这对化合物激光性能优良,在红光区域可以与商品化染料竞争。K8的最大吸收在675 nm,荧光发射在700 nm,在强极性溶剂中荧光量子产率为0.7以上,对活细胞无毒副作用,是一个近红外生物荧光标记试剂。4.以氟硼吡咯染料为能量供体,通过简洁的合成手段得到了基于能量转移机理设计的化合物E1和E2,对其光谱性质及激光性能进行了一定的研究。将参比化合物T2和E1进行对比测试,用不同波长激发光源500 nm,532 nm和570 nm进行激发,证实了E1分子能量转移过程的发生。E1和E2是一对结构新颖、创新设计的激光染料,为激光染料的研发提供一条新路。更多还原

【Abstract】 Organic optical materials are hence suitable for use in many fields, for example, photolumicescence and electroluminescence, which have attracted considerable attentions. In the last decades, boron dipyrromethene dyes (BODIPY) have draw much attention of the researchers for their exceptional photochemistry and photophysical properties. In this paper, new series of BODIPY dyes have been synthesized and identified. The optical and electrochemistry properties have been studied to explore the applications of these compouds in fluorescent sensing and optical functional materials (electroluminescent materials, two-photon absorption activity materials and laser dyes).1. The new fluorophores were synthesized by Suzuki coupling recation onβ-position of the BODIPY core. Compounds 6a and 6b were designed for detecting proton based on PET (Photoinduced Electron Transfer) mechanism. The electron transfer processes were proved by crystal data and electrochemistry research. Compounds 7 and 8 contained conjugated double bonds, which resulted in the notable long maximum absorption wavelength, the fluorescence emission wavelength, and the large Stokes shift (more than 80 nm).2. Four novel fluorescent dyes were obtained by introducing conjugated groups onβ-position of the BODIPY through Sonogashira coupling reaction. Systemic research on the compounds was carried out, and compound T2 was used as the reference compound because of its simple structure. Compounds T3 and T4 were two D-π-D type two-photon activity materials with long absorption and emission wavelengths (650 nm), also with good linear optical properties. The preliminary fluorescence imaging experiments indicated their cell-permeability and nontoxicity. This suggested that the novel BODIPY dyes were highly applicable as fluorescent reporters, particularly in assays which were based on two-photon excited fluorescence. Compound T5, bulky 4-tritylphenylethynyl substituted BODIPY with pure red emission, relatively large Stokes shift, high fluorescence quantum yield, less self-quenching was efficiently synthesized. The electroluminescent properties were also preliminary investigated.3. Compounds K1-K8 were synthesized by introducing conjugated groups on a-position of BODIPY through Knoevenagel reaction. Contrastive research was carried on K1-K5 in detail. Through comparison and combination of two strategies, extension ofπ-conjugation and adjustment of ICT effects, we obtained a new carbazole-containing BODIPY derivative K5 which was an excellent fluorophore with relatively long emission, large molar extinction coefficient, narrow spectra shapes, high fluorescence quantum yields in polar and apolar solvents. These advantageous characteristics together with the laser properties make it potentially useful as a new biological tool. K6 and K7 were two red emission laser dyes with excellent luminescent yields and photostabilities, which can compete with the commercial dyes in red region. Compound K8 was a good NIR fluorescent dye with maximum absorption at 675 nm, fluorescence emission at 700 nm and fluorescence quantum yield 0.7 in polar solvents.4. Compounds E1 and E2 were obtained by simple and convenient methods which designed based on fluorescence resonance energy transfer mechanism, and BODIPY acted as the energy donor. The optical and laser properties were investigated. Comparing reference compound T2 and E1, excited by different lamps (500 nm,532 nm and 570 nm), it also proved the FRET process in E1. It provided a route to novel laser dyes.更多还原