Kodate Satoshi, Wada Haruhiko, Suzuka Isamu, Okamoto Akimitsu, Tainaka Kazuki, Saito Yoshio, Saito Isao
Department of Materials Chemistry and Engineering, College of Engineering, Nihon University, Koriyama, Fukushima 963-8642, Japan.
Nucleic Acids Symp Ser (Oxf). 2006(50):211-2. doi: 10.1093/nass/nrl105.
We examined the dual fluorescence mechanism of 8-[4-(dimethylamino)phenyl]-N-2-propynyl-1-pyrenecarbox-amide (PyADMA) in polar solvent. The emission band appeared on the short wavelength side does not depend on the solvent polarity. On the other hand, the red shifted emission band depends on solvent polarity. On the face of it, the phenomenon is similar to intramolecular charge transfer (ICT) dynamics of 4-dimethylamino benzonitrile (DMABN). However, direct absorption band from ground state to ICT state is observed on the fluorescence excitation spectrum at room temperature. It is suggest that PyADMA would emit from both S(1) and S(2) state against the Kasha rule. On the other hand, we also examined the interaction between PyADMA and nucleoside which composing PyDMA-U in water solution. We found out that dynamics of excited states of PyADMA monomer is different from them of PyDMA-U.
我们研究了8-[4-(二甲基氨基)苯基]-N-2-丙炔基-1-芘甲酰胺（PyADMA）在极性溶剂中的双荧光机制。出现在短波长侧的发射带不依赖于溶剂极性。另一方面，红移发射带依赖于溶剂极性。表面上看，该现象类似于4-二甲基氨基苯甲腈（DMABN）的分子内电荷转移（ICT）动力学。然而，在室温下的荧光激发光谱上观察到了从基态到ICT态的直接吸收带。这表明PyADMA可能违反卡莎规则从S(1)和S(2)态都有发射。另一方面，我们还研究了PyADMA与在水溶液中构成PyDMA-U的核苷之间的相互作用。我们发现PyADMA单体的激发态动力学与PyDMA-U的不同。
