Czakler Matthias, Litschauer Marco, Föttinger Karin, Peterlik Herwig, Neouze Marie-Alexandra
Vienna University of Technology, Institute for Materials Chemistry 165, 1060 Vienna, Austria, and University of Vienna, Faculty of Physics, 1090 Vienna, Austria.
J Phys Chem C Nanomater Interfaces. 2010 Dec 16;114(49):21342-21347. doi: 10.1021/jp109273d. Epub 2010 Nov 19.
Recently we published the synthesis of new hybrid materials, ionic silica nanoparticles networks (ISNN), made of silica nanoparticles covalently connected by organic bridging ligands containing imidazolium units owing to a "click-chemistry-like" reaction. Among other techniques small-angle X-ray scattering (SAXS) experiments were carried out to get a better picture of the network extension. It turned out that the short-range order in ISNN materials was strongly influenced by the rigidity of the bridging ligand, while the position of the short-range order peaks confirmed the successful linking of the bridging ligands. The photoluminescence experiments reported in this communication revealed strongly enhanced emission in the hybrid material in comparison with neat imidazolium salts. Moreover the shift of the emission maximum toward longer wavelengths, obtained when varying the aromatic ring content of the bridging ligand, suggested the existence of strong π-π stacking in the hybrid material. Experiments revealed a stronger luminescence in those samples exhibiting the higher extent of short-range order in SAXS.
最近我们发表了新型杂化材料——离子型二氧化硅纳米颗粒网络（ISNN）的合成方法，该材料由二氧化硅纳米颗粒通过含有咪唑鎓单元的有机桥连配体经“类点击化学”反应共价连接而成。除其他技术外，还进行了小角X射线散射（SAXS）实验，以更好地了解网络扩展情况。结果表明，ISNN材料中的短程有序受到桥连配体刚性的强烈影响，而短程有序峰的位置证实了桥连配体的成功连接。本通讯报道的光致发光实验表明，与纯咪唑鎓盐相比，杂化材料中的发射强烈增强。此外，当改变桥连配体的芳环含量时，发射最大值向更长波长的移动表明杂化材料中存在强烈的π-π堆积。实验表明，在SAXS中表现出更高短程有序程度的那些样品中发光更强。
