基于马鞍形环八四噻吩的复合纳米材料的制备及发光性能

由于环八四噻吩具有独特的"马鞍形"空间结构和光电性质,因此受到越来越多的关注.环八四噻吩(COThs)共有14种同分异构体,其中COTh-1是一类特殊的聚集诱导发光体系,但仅在四氢呋喃等少数有机溶剂中有一定的溶解度,发光强度较弱,限制了这类材料的应用.多孔二氧化硅纳米材料具有比表面积大、孔体积大、粒径可调、生物相容性好...

Preparation of Saddle-Shaped Cyclooctatetrathiophene-Based Hybrid Nanomaterials and Fluorescence Properties

Cyclooctatetrathiophenes(COThs)have attracted much attention for their unique“saddle-shaped”space structure,and interesting photoelectric properties.COThs have fourteen isomers and five of them have been reported up to now.COTh-1 exhibits aggregation induced emission properties.More importantly,the mechanism stems from its“saddle-shaped”structure.However,this compound can only be dissolved in few kinds of organic solvent such as tetrahydrofuran,and the low luminescence intensity limits their applications.Porous silica nanomaterials have the advantages of large specific surface area,large pore volume,tunable particle size,good biocompatibility,environmental friendliness and surface functionality.They can be used as good candidates for composing with organic materials.In this work,COTh-1 functionalized with 3-aminopropyltriethoxysilane,then COTh-silica hybrid nanomaterial were prepared by sol-gel method.Their structures,morphology and fluorescence properties were characterized carefully with Fourier transform infrared(FT-IR),scanning electron microscope(SEM)and fluorescence spectrum,respectively.FT-IR results show that COTh-1 molecules are linked on silica via covalent bonds.The morphology of hybrid particle is uniform sphere with size of 90~100 nm.More importantly,the emission intensity of the hybrid material is enhanced unambiguously compared with that of COTh-1.The possible reason is that COTh-1 molecules are fixed within the pores of silica and results in restriction of the intramolecular motions of COTh-1 molecules.