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我们合成了N,N′-二甲基-二-β-萘甲基乙二胺(Ⅰ),N,N′-二甲基-二-β-萘甲基丙二胺(Ⅱ),N,N′-二-β-萘甲基哌嗪(Ⅲ)三个化合物,并测定了它们的荧光光谱。结果表明,它们既能形成分子内激基缔合物(excimer),又能形成分子内激基复合物(exciplex),与溶剂极性有关。在极性较大的溶剂如乙腈和甲醇中,由于激基复合物几乎完全解离因而不发射荧光,这时观察到的荧光峰蓝移而且强度增加,可以认为,这是激基缔合物存在的证明。这三个化合物的分子内激基缔合物形成的难易程度按Ⅱ>Ⅰ>Ⅲ的次序依次递降。
We synthesized N, N’-dimethyl-bis-β-naphthylethylenediamine (Ⅰ), N, N’-dimethyl-bis-β-naphthylmethylpropanediamine , N’-bis-β-naphthylmethylpiperazine (Ⅲ), and their fluorescence spectra were measured. The results show that they both form an intramolecular excimer and an intramolecular exciplex, which is related to the solvent polarity. In the more polar solvents such as acetonitrile and methanol, since the exciplex is almost completely dissociated and thus does not emit fluorescence, the observed fluorescence peak is blue-shifted and the intensity is increased, and it is considered that this is an excimer Proof of existence. The ease of formation of intramolecular exciplexes of these three compounds decreases in order of II> I> III.