Pyreneamide-based dipodal probes for ultra-sensitive and selective detection of 3,5-dinitrosalicylic acid in an aqueous solution
作者:Ashwani Kumar、Pil Seok Chae
DOI:10.1016/j.dyepig.2017.08.039
日期:2017.12
Pyrene-appended dipodal probes (probes 1 and 2) with differences in conformational rigidity were synthesized for sensitive detection of 3,5-dinitrosalicylic acid (DNSA) in an aqueous solution. Both dipodal probes had two pyrene units and exhibited quenching caused by aggregation (ACQ) at high water content (>60%) in DMSO. As the pyrene dimer (e.g., excimer) was a dominant conformation in 99% aqueous
合成了构象刚度不同的带有-的二足探针(探针1和2),用于灵敏检测水溶液中的3,5-二硝基水杨酸(DNSA)。两个二脚架探针均具有两个pyr单元,并且在高DMSO中的高水分含量(> 60%)下表现出由聚集(ACQ)引起的猝灭。由于the二聚体(例如,受激准分子)是在99%水溶液中的主要构象,因此激发后,两个探针在486 nm(探针1)或480 nm(探针2)上均显示出足够的准分子发射强度。探针(探针1和2)的准分子发射在DNSA存在下被灵敏地淬灭。探针1在各种羧酸(CA)中对DNSA有选择性的响应,而探针2对DNSA和5-NSA都有响应。密度泛函理论(DFT)计算表明,在存在DNSA的情况下,探针会发生结构变化,从而导致探针的每个pyr单元与客体分子的苯环之间形成新的π - π相互作用。这种新的π - π相互作用使能量能够从to转移到非辐射客体分子(DNSA),从而导致探针中的荧光猝灭。探针