Five novel N-benzamidobisindolylmaleimide derivatives 6a～6c and 7a～7b were designed and synthesized from succiminide by bromination, indole addition, hydrazine cyclization, acylation, alkylation and so on. Their structures were confirmed by IR, ¹H NMR and HRMS techniques. Their ultraviolet and fluorescence properties have been studied. The results suggested that the target compounds showed two maximum absorption peaks at 360～400 and 450～500 nm in UV spectrum. The maximum emision wavelength was around 560～620 nm in fluoresecnce spectrum. The effect of structure of the compounds on fluorescence properties was also discussed. Using rhodamine B as a reference, the fluorescence quantum yields for all compounds were detected. The compound 7a has the strongest fluorescence quantum yield. The results showed that the polarity of the solvents has a little effect on the fluorescence quantum yields. Thermal behavior of the compounds 7a and 7b have been investigated by DSC (different scanning calorimetric) and TGA (thermogravimetric analysis). Glass-transition temperature (T_g) of 7a and 7b appeared at 80 and 116 ℃, respectively. The high thermal stabilities for the target compounds were confirmed by TGA experiment. No sign of decomposition appeared upon heating below 400 ℃.

Key words: bisindolylmaleimide, ultraviolet analysis, fluorescence property, thermal stability