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本文测定了N,N′-双-β-萘甲基哌嗪(DMNP)在苯与乙腈混合溶剂中的荧光光谱。在乙腈含量<5(mol·dm~(-3))时,乙腈猝灭DMNP苯溶液的荧光符合Stern-Volmer方程,表明极性溶剂分子乙腈与DMNP分子内激基复合物存在着相互作用。随着乙腈含量的增加,DMNP分子内激基复合物(exci-plex)荧光的猝灭与红移以及分子内激基缔合物(excimer)的逐步形成则仅与体系的极性有关。文中还讨论了DMNP激发态复合物形成的机理。
In this paper, the fluorescence spectra of N, N’-bis-β-naphthylmethylpiperazine (DMNP) in a mixed solvent of benzene and acetonitrile were measured. At acetonitrile content <5 (mol · dm -3), the fluorescence of acetonitrile-quenched DMNP solution agrees with the Stern-Volmer equation, indicating that the polar solvent molecule acetonitrile interacts with the DMNP exciplex. With the increase of acetonitrile content, the quenching and red-shift of excimer fluorescence in DMNP and the progressive formation of intramolecular excimer are only related to the polarity of the system. The mechanism of DMNP excited state complex formation is also discussed.