Because of the serious threat to human health, the development of fluorescent sensor for detection of formaldehyde (FA) has attracted great concern. Herein, a 4,4′-(1,2-diphenylethene-1,2-diyl)dibenzoic acid-based SOF (HNU-44), has been assembled, which can be used to detect FA by quite different fluorescent response in liquid and gas. In liquid phase, HNU-44 exhibits fluorescence enhancement with the limit of detection (LOD) 27.41 ppb. On the contrary, fluorescence quenching happens when HNU-44 is exposed in the FA atmosphere with the LOD of 2.61 ppb. The LOD in gas is even lower than the air quality criterion of gaseous FA (80 ppb) recommended by World Health Organization (WHO). Furthermore, sensing tests were performed on fish samples, which means that HNU-44 can be used in actual sample. This work expands promising approach for effective FA detection both in the experiment test and actual application.

由于对人类健康的严重威胁，用于检测甲醛（FA）的荧光传感器的发展引起了人们的极大关注。在此，我们组装了一种基于 4,4'-(1,2-diphenylethene-1,2- diyl ) dibenzoic acid 的 SOF ( HNU-44 )，可用于通过完全不同的液体荧光响应检测 FA和气体。在液相中，HNU-44表现出荧光增强，检测限 (LOD) 为 27.41 ppb。相反，当HNU-44暴露在 LOD 为 2.61 ppb 的 FA 气氛中时，会发生荧光猝灭。气体中的 LOD 甚至低于世界卫生组织 (WHO) 推荐的气态 FA 的空气质量标准 (80 ppb)。此外，对鱼类样本进行了传感测试，这意味着HNU-44可用于实际样品。这项工作扩展了在实验测试和实际应用中有效检测 FA 的有前途的方法。