有机纳米分子聚集体PIC-I的Raman光谱研究

Raman Spectrum of Organic Nanostructure PIC-I Molecular Aggregates

本文从分子聚集体ＰＩＣ－Ｉ的吸收光谱可观测到Ｊ－带的红移和窄化，并可算出１３６８ｃｍ－１振模，以及本实验条件下聚集体单体数目为Ｎ≈３链长为３×０．３ｎｍ＝０．９ｎｍ。测量了ＰＩＣ－Ｉ聚集体的荧光光谱，将它与吸收光谱相比较可以看出，聚集体吸收带（５７２．５ｎｍ）和荧光发射带（５７２．５ｎｍ）是共振的。系统地研究了ＰＩＣ－Ｉ聚集体的喇曼光谱（１００～１８００ｃｍ－１），验证了振动模 １３６８ｃｍ－１的存在。

Molecular aggregates are mesoscopic clusters of molecules, with intermediate sizes between crys- tals and isolated molecules. Molecular aggregates belong to the group of nanostructure materials, which are presently at the heart of scientific fashion. In particular the unique optical properties of these materials receive much attention. An important difference between aggregates and most other nanostructures is the absence of electron delocalization, which makes its optical response easier to model. The red shift and narrowing for J-band were observed from the absorption spectrum of molecular aggregates PIG-I in this paper. The number of monomers in the chain N≈3, or chain length L 0.3nm× 3 = 0. 9nm were calculated, and vibration mode 1 368cm-1 was derived from the experimental data. Com- paring the fluorescence spectrum with the absorption spectrum it is found that the emission band 572 . 5nm and absorption band 572. 5nm is resonance. Raman spectra (100~ 1 800cm-1) of molecular aggregates PIC-I were systematically investigated.