The measured absorption and fluorescence spectra have shown that NO-G2 exhibits nonlinear absorption than BO-G2,owing to the former possessing pn junction and resultant more obvious intramolecular charge transfer.

• 吸收光谱和荧光光谱证实；NO-G2具有较大的激发态和基态偶极矩差值；存在着明显的分子内电荷转移和非线性吸收.