Fluorescence emission from 2,6-naphthylene-bridged mesoporous organosilicas with an amorphous or crystal-like framework.
Fluorescence emission from 2,6-naphthylene-bridged mesoporous organosilicas with an amorphous or crystal-like framework.
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DOI：
10.1002/chem.200801238
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Norihiro Mizoshita;Y. Goto;M. Kapoor;Toyoshi Shimada;T. Tani;S. Inagaki
中科院分区：
文献类型：
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作者：
Norihiro Mizoshita;Y. Goto;M. Kapoor;Toyoshi Shimada;T. Tani;S. Inagaki
我们报道了2,6-萘桥接的周期性介孔有机硅表现出独特的荧光行为，反映了框架中分子尺度的周期性。以萘基有机硅烷前驱体为原料，在模板表面活性剂的作用下，通过水解缩合，合成了由萘-硅杂化骨架组成的周期介孔有机硅。有机硅材料的形态、介观和分子尺度的周期性与合成条件密切相关。嵌套在分子有序框架内的萘部分表现为单体带发射，而嵌套在无定形框架内的萘部分表现为准分子带的宽发射。这些结果表明，固定在晶体状框架内的萘基团尽管具有密集的排列结构，但它们是分离的，不同于传统的有机硅框架，在室温下晶体状和非晶态框架都只观察到准分子发射。这一关键发现表明，有可能控制有机基团之间的相互作用，从而控制无机/有机杂化物的光学性质。
We report that 2,6-naphthylene-bridged periodic mesoporous organosilicas exhibit unique fluorescence behavior that reflects molecular-scale periodicities in the framework. Periodic mesoporous organosilicas consisting of naphthalene-silica hybrid frameworks were synthesized by hydrolysis and condensation of a naphthalene-derived organosilane precursor in the presence of a template surfactant. The morphologies and meso- and molecular-scale periodicities of the organosilica materials strongly depend on the synthetic conditions. The naphthalene moieties embedded within the molecularly ordered framework exhibited a monomer-band emission, whereas those embedded within the amorphous framework showed a broad emission attributed to an excimer band. These results suggest that the naphthalene moieties fixed within the crystal-like framework are isolated in spite of their densely packed structure, different from conventional organosilica frameworks in which only excimer emission was observed for both the crystal-like and amorphous frameworks at room temperature. This key finding suggests a potential to control interactions between organic groups and thus the optical properties of inorganic/organic hybrids.