不同方位取代的二氰基乙烯基蒽的光谱行为的研究

A Study of Spectroscopic Behavior of Anthracene Substituted by Dicyanovinyl in Different Positions

本文设计合成了二个典型的共轭的电子给体与电子受体（D－A）化合物：2－二氰基乙烯基蒽（2－DCVA）与9－二氰基乙烯基蒽（9－DCVA）．考察了极性因素、温度因素对化合物发光能力的影响。研究表明：在不同极性溶剂中该二化合物均发分子内电荷转移（ICT）态的荧光，但2－DCVA的荧光量子产率（Φf）远大于9－DCVA的荧光量子产率，造成这一现象的主要原因可能是2－DCVA分子的平面性好于9－DCVA分子而引起分子内电荷转移相互作用不同所致．文中还用Bilot－Kawski公式估算了该二化合物在激发态与基态时仍极矩的差值。

Two conjugating electron donor-acceptor (D-A) compounds, 2-dicyanovinyl anthracene (2-DCVA )and 9-Aidicyanovinyl anthracene(9-DCVA), were synthesized and their spectroscopic properties in a series of solvents with different polarity and at different temperatures were studiecl. The resuits reveal that both compounds show intramolecular charge transfer (ICT)state emission at different polarity of solvents and the fluorescence quantum yield (Φf) of 2-DCVA is much higher than that of 9-DCVA, due to that the structure of 2-DCVA is more planar than 9-DCVA. The dipole moment differences between excited states and ground states of the both compounds were estimated by the formula of Bilot-Kawski.