A histidine-containing bola-amphiphilic molecule (NDIP) containing a peptide-appended naphthalenediimide (NDI) forms fluorescent hydrogels in phosphate buffer and organogels with benzenoid solvents. These gels were characterized by several spectroscopic and microscopic techniques including FT-IR, HR-TEM, powder X-ray diffraction and small-angle X-ray scattering, UV-Vis and fluorescence studies. The gelator molecule exhibits no significant fluorescence in the xerogel state, while it shows a significant fluorescence (bright cyan) in the presence of volatile organic/inorganic acid vapors; this cyan color vanishes in presence of base (ammonia vapors). A reusable paper-strip-based method based on this self-assembled fluorescent material can be used to easily detect hazardous volatile acid and base vapors with the naked eye.

中文翻译：

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自组装肽附加的萘二酰亚胺：用于感测酸和碱蒸气的荧光开关。

含有肽的萘二酰亚胺（NDI）的含组氨酸的两亲分子（NDIP）在磷酸盐缓冲液中形成荧光水凝胶，并与苯类溶剂形成有机凝胶。这些凝胶的特征在于几种光谱和显微技术，包括FT-IR，HR-TEM，粉末X射线衍射和小角X射线散射，UV-Vis和荧光研究。胶凝剂分子在干凝胶状态下没有显示出明显的荧光，而在挥发性有机/无机酸蒸气的存在下，它却显示出了明显的荧光（亮蓝绿色）。在存在碱（氨蒸气）的情况下，该青色消失。基于这种自组装荧光材料的可重复使用的基于纸带的方法可用于肉眼轻松检测有害的挥发性酸和基础蒸气。