固气界面上花菁染料J-聚集体的研究  

Investigation of Pseudoisocyanine Dye J-aggregates at a Solid/Air Interface

作　　者：欧忠敏[1] 

机构地区：[1]华南师范大学激光生命科学研究所暨激光生命科学教育部重点实验室,广东广州510631

出　　处：《激光生物学报》2010年第4期443-445,共3页Acta Laser Biology Sinica

基　　金：国家自然科学基金项目(30800261);教育部留学回国科研启动基金(教外司留[2009]8号);人事部留学人员科技活动项目择优资助项目(2008年)资助课题;广东高校优秀青年创新人才培育项目(育苗工程项目)(2008年)

摘　　要：研究固气界面上花菁染料J-聚集体的光学性质、形貌特点和形成机制。以花菁染料为研究对象,在云母基底表面制备花菁染料的超分子J-聚集体,根据J-聚集体独特的光学性能,通过紫外吸收光谱,荧光光谱,荧光显微镜等对云母界面上的花菁染料聚集体进行光谱测量和形貌表征。结果表明:云母/空气界面上的花菁染料聚集体在580 nm处出现相对于染料单体红移且狭窄的强吸收峰,而在583 nm处出现一个伴随微弱Stokes位移的荧光峰,这些结果符合吸附在基质上的J-聚集体的光学特征,同时荧光显微镜观察表明云母基底上分散分布着2～4μm微晶棒状的聚集体。结果证明:花菁染料能够在云母/空气界面生成超分子J-聚集体,其形成机制是通过带正电荷的花菁染料分子与云母基底表面带负电荷的空穴通过外延相互作用形成的。J-aggregates of pseudoisocyanine （PIC） dye at a mica/air interface were investigated because of their interesting optical properties. In this study, aggregates of PIC were prepared on a mica base. Absorption spectrum and fluorescence spectrum of the aggregates were recorded, and the morphology of the aggregates was measured by fluorescence microscope. Narrow and intense J-band at 580 nm in the absorption spectrum is the evidence that J-aggregates of PIC were produced. Small stokes shift in the fluorescence spectrum is the peculiarity of J-aggregate on the base. Typical fluorescence micrograph shows that microcrystalline J-aggregates （2 - 4 μm） precipitated separately on mica. The results indicate that J-aggregates of PIC were produced at a mica/air interface. The formation mechanism of J-aggregates may result from the epitaxial interaction between the positively charged N atoms of PIC molecules and the negative holes left by the dissociating K ^＋ ions of mica.

关 键 词：花菁染料 云母 J-聚集体 固气界面 

分 类 号：Q631[生物学—生物物理学]