青岛科技大学胡志强团队报道了基于酸致变色有机荧光材料的多色防伪策略及同步大容量存储。相关研究成果发表在2024年5月27日出版的《中国化学》。

许多行业都受到假冒商品造成的经济损失和产品故障的困扰。因此，不断需要先进的防伪技术。

该研究中，研究人员通过修饰不同的给电子基团，构建了一系列酸碱敏感的环状查尔酮染料A-F。NMR和理论计算很好地解释了不同结构的酸敏感性的差异。苯胺比脂肪胺更难质子化，因此在荧光方面存在差异。信息的隐藏和防伪就是通过这种现象实现的。粉末X和Y是含有蒙脱石和环状查尔酮的防伪荧光粉末，具有橙色荧光和非常相似的外观。

然而，在酸的影响下，含有三苯胺修饰的环状查尔酮的粉末X显示出红移的荧光，而含有吗啉基和二乙氨基修饰的环状查尔酮的粉末Y显示出蓝移的荧光。因此，基于环状查尔酮的防伪策略不仅限于紫外线照射的荧光显影，而且在酸性显影剂的帮助下具有更多的着色和图案变化。利用A-F实现了数字、英文字母和汉字的数据加密和解密，具有很大的实际应用潜力。

附：英文原文

Title: Multicolor Anti-counterfeiting Strategy and Synchronous High Capacity Storage Based on Acidochromic Organic Fluorescent Materials

Author: Ying Fang, Jun-Yu Luan, Li-Hao Liu, Ying-Qing Huang, Yi-Ning Luo, Kun-Peng Wang, Shaojin Chen, Hai-Yu Hu, Zhi-Qiang Hu

Issue&Volume: 2024-05-27

Abstract: Many industries are plagued by economic losses and product failures caused by counterfeit goods. Therefore, advanced anti-counterfeiting techniques are continuously needed. In this study, we constructed a series of acid-base sensitive cyclic chalcone dyes A—F by modifying different electron-donating groups. Differences in acid sensitivity of different structures are well rationalised by NMR and theoretical calculations. Aniline is difficult to protonate than fatty amines, so there is a difference in fluorescence. Hiding and anti-counterfeiting of information is achieved by this phenomenon. Powder X and Y are the anti-counterfeit fluorescent powder containing montmorillonite and cyclic chalcone, which have orange fluorescence and the very similar appearance. However, under the influence of acid the Powder X containing triphenylamine modified cyclic chalcone shows red shifted fluorescence and Powder Y containing morpholino and diethylamino groups modified cyclic chalcone shows blue shifted fluorescence. Therefore, the anti-counterfeiting strategy based on cyclic chalcone is not only limited to UV-irradiated fluorescence development, but also has more colorization and pattern variations with the aid of acid developer. Data encryption and decryption of numbers, English alphabets and Chinese characters have been realized using A—F, which have great potential for practical applications.

DOI: 10.1002/cjoc.202400259

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202400259