Study on initial processes of crystal nucleolus formation as probed by fluorescence spectral change due to the organic molecular assemblies

有机分子组装体引起的荧光光谱变化探测晶核形成初始过程的研究

• 批准号: 21750021
• 负责人: ITO Fuyuki
• 金额: $ 2.58万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21750021/
• 关键词: 有機分子集合体; 蛍光スペクトル; 結晶核生成; 高分子薄膜; 有機結晶; ペリレン誘導体; ピレン誘導体

We have studied on intial processes of crystal nucleolus formation as probed by fluorescence spectral change due to the organic molecular assemblies. Trimethyl-(2-oxo-2-pyrene-1-yl-ethyl)-ammonium bromide (PyAm) was used as a fluorescent dye molecule. The size of PyAm aggregates in the PVA thin films were increased with increasing dye concentration. The fluorescence spectra of PyAm in the PVA film at a lower concentration of 0.001mol% only showed the monomer emission. The fluorescence peak shifted to the red with increasing dye concentration, which was assigned to a dimer or excimer-like emission. Changes in the fluorescence spectra relate to the formation of aggregates in the films. The nano-crystals and/or aggregates formed by phase separation are presumed to show hierarchical change (like a consecutive reaction) of fluorescence property depending on the domain size. We also find the fluorescence spectral change of PyAm nano-aggregates by the photo irradiation. It is originated from the photoinduced dissolution of PyAm aggregates.

我们已经研究了由于有机分子组件引起的荧光光谱变化所探测的晶体核核形成的Intial过程。三甲基 - 溴化物（PYAM）用作荧光染料分子。 PVA薄膜中PYAM聚集体的大小随染料浓度的增加而增加。 PVA膜中PYAM的荧光光谱在较低的0.001mol％浓度下仅显示单体发射。随着染料浓度的增加，荧光峰转移到了红色，该染料浓度分配给了二聚体或准颗粒样发射。荧光光谱的变化与膜中聚集体的形成有关。假定由相位分离形成的纳米结晶和/或聚集体，以显示荧光特性的层次变化（如连续反应），具体取决于域的大小。我们还发现通过照片辐照到PYAM纳米聚集的荧光光谱变化。它起源于PYAM聚集体的光诱导溶解。