Organic-inorganic hybrids with high luminescence were facilely obtained by a one-pot process through the combination of sol–gel condensation and radical copolymerization. The sol–gel reaction of methyltrimethoxysilane (MeTMOS) was carried out together with radical copolymerization of 2-hydroxyethyl methacrylate (HEMA) with methacrylate-tethering boron dipyrromethene (BODIPY) dye 1, which was prepared by the reaction of a meso-butyl-substituted BODIPY dye and potassium methacrylate, under microwave irradiation or conventional heating conditions. The obtained hybrids were characterized by UV-vis and photoluminescence spectroscopies, and differential scanning calorimetry (DSC) thermogram, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) measurements. Microwave irradiation led to a more rapid and homogeneous reaction as compared to conventional heating conditions. Therefore, the obtained hybrids by means of microwave irradiation showed higher transparency owing to inhibition of aggregation derived from π–π stacking of BODIPY units. Quantum yields (ΦF = ∼94%) of the obtained hybrids were higher than those of 1 in methanol solution. Photostability of the hybrids was improved in comparison with that of poly(HEMA-co-1) film due to shielding by silica matrices; i.e., the access of oxygen in the excited state of BODIPY units is avoided. Moreover, the elution of BODIPY dye 1 from the hybrids was significantly reduced as compared to BODIPY dye without the methacrylate group due to the covalent bond between HEMA polymer and 1.
通过溶胶-凝胶缩合和自由基共聚相结合的单锅工艺,轻松获得了具有高发光性能的有机-无机杂化物。在微波辐照或传统加热条件下,甲基
三甲氧基硅烷(MeTMOS)的溶胶-凝胶反应与
甲基丙烯酸羟乙酯(
HEMA)与
甲基丙烯酸酯系
硼二
吡咯美烯(BODIPY)
染料 1 的自由基共聚反应同时进行。获得的混合物通过紫外-可见光谱、光致发光光谱、差示扫描量热法(
DSC)热图、热重分析(TGA)和扫描电子显微镜(
SEM)测量进行了表征。与传统的加热条件相比,微波辐照能使反应更迅速、更均匀。因此,通过微波辐照获得的混合物显示出更高的透明度,这是因为 BODIPY 单元的 π-π 堆积产生的聚集受到了抑制。获得的混合物的量子产率(ΦF = ∼94%)高于
甲醇溶液中的 1。与聚(
HEMA-co-1)薄膜相比,由于
二氧化硅基质的屏蔽作用,混合物的光稳定性得到了改善,即避免了 BODIPY 单元激发态中氧的进入。此外,由于
HEMA 聚合物与 BODIPY
染料 1 之间的共价键作用,与不含
甲基丙烯酸酯基团的 BODIPY
染料相比,混合物对 BODIPY
染料 1 的洗脱明显减少。