图2。(a-c) UV-vis absorption spectra (Absorbance axis on left) and emission spectra (photoluminescence = PL axis on right) of commercial or recrystallized pure compounds 2,3-DAP (commercial), 2,7-DAP, (recrystallized), and MQA (commercial) shown as solid blue and red curves, compared to the byproducts from our synthesis captured in the low molecular mass (<500 da)透析液(点缀蓝色和红色曲线),也与参考文献中CD的光谱进行了比较。[13](虚线黑色曲线)。完全匹配了2,3-DAP和MQA光谱(<2%),而2,7-DAP由于原始透析液中存在额外的杂质而在低吸光度下显示出很小的差异(请参阅表S1)。我们的P-,O-和M-CD的吸收光谱和发射光谱如图6,具有完全不同的吸收和发射最大值和形状。
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