含有双发色团的化合物分子内能量传递的研究

合成了一系列含有萘环和蒽环的不同链长的二元化合物, 简写为N-Mn-A(n=2,4,6,8,10)。在有机溶剂中做了上述系列化合物的荧光光谱。激发波长为λex=280nm时, 发现荧光光谱中有两个发射峰, λem1=370nm, λem2=450nm。前者为萘的荧光峰, 后者为蒽的荧光峰。实验证明, 只有萘吸收280nm的光, 而蒽无吸收。所以在激发萘的条件下, 能量由处于激发态的萘环传向了外于基态的蒽环。在不同的有机溶剂中, 分别做了该系列化合物的荧光光谱随浓度的变化。实验结果指出, 两个荧光峰强度的比值不随浓度的变化而变化, 表明其能量传递为分子内的能量传递。另外在1%的糖淀粉水溶液中, N-Mn-A的浓度为1.0×10^-^5mol.dm^-^3,通过荧光光谱发现没有发生能量传递。表明处于伸展状态的N-Mn-A化合物分子不能发生能量传递。

Intramolecular energy transfer study of naphthalene-anthracene-end labelled polymethylene

The fluorescence spectra of N-Mn-A were investigated in various organic olvents selectively, excitation of the naphthalene group at λ ex=280nm resulted in two emission peaks with λem1=370nm, λem2=450nm. The former is the fluorescence of the naphthalene group and the later is the fluorescence of the anthracene group. It is proved by experiment that naphthalene only has absorption peak with it λmax at 280nm and anthracene shows no aborption at this region. So the energy is transferred from the excited naphthalene to the ground anthracene. The fluorescence spectra of the substrate (n=6,10) with vfariou concentration were investigated in different organic solvent. It is found that the ratio of the intenitie of the two fluorescence peaks is independent of the concentration, uggesting that the energy transfer occurs intramolecularly.