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以短链阳离子三聚表面活性剂[C10H21N+(CH3)2(CH2)2N+(CH3)(C10H21)(CH2)2N+(CH3)2C10H21]·3Br-为结构导向剂,通过2,7-二(3-三乙氧硅基氨丙酯基)萘(NIS)和四乙氧基硅烷(TEOS)共缩聚,制备了有序的萘基桥联的杂化周期性介孔有机硅(PMOs).样品通过X射线衍射(XRD)、高分辨透射电镜(HRTEM)、氮气吸附-脱附、差示扫描量热/热重分析(DSC/TGA)表征.结果表明,当NIS占NIS和TEOS总量40%(摩尔分数)时,可以形成具有结晶态孔壁的有序介孔杂化材料.当NIS含量低于或高于40%时,分别形成无定形孔壁的有序介孔杂化材料和无孔杂化材料.随着孔壁中萘基基团的增加,由于有机基团之间π-π堆积作用增强,杂化介孔材料显示良好的热稳定性.由于在二氧化硅骨架中嵌入荧光萘基基团,杂化有机-无机有序介孔材料显示了激基缔合物的光学行为.随萘基基团含量的增加,杂化材料的紫外吸收峰发生蓝移,形成H聚集体;由于聚集引起的荧光淬灭,杂化材料的荧光量子产率明显降低.
The short-chain cationic trimeric surfactant (C10H21N + (CH3) 2 (CH2) 2N + (CH3) (C10H21) (CH2) 2N + (CH3) 2C10H21] · 3Br- (NIS) and tetraethoxysilane (TEOS) were co-polycondensated to prepare ordered naphthyl bridged hybrid periodic mesoporous silica (PMOs) .Samples Characterization by XRD, HRTEM, N2 adsorption-desorption and DSC / TGA showed that when NIS accounted for 40% of the total amount of NIS and TEOS % (Mole fraction), ordered mesoporous hybrid materials with crystalline pore walls can be formed.When the NIS content is lower or higher than 40%, ordered mesoporous hybrid materials with amorphous pore walls and Nonporous hybrid materials.With the increase of naphthalene groups in the pore walls, hybrid mesoporous materials show good thermal stability due to the π-π stacking effect between organic groups.Because fluorescence is embedded in the silica framework The naphthalene groups and hybrid organic-inorganic mesoporous materials show the optical behavior of excimers.With the increase of the content of naphthyl group, the UV absorption peak of hybrid material blue-shift to form H aggregate ;by In the fluorescence quenching caused by the aggregation, the fluorescence quantum yield of the hybrid material is significantly reduced.