Phosphoric acid-catalyzed synthesis of fused pyridocoumarins and their acidochromic applications
作者:Vineet Verma、Himshikha Sharma、Kavita、Jyotirmoy Maity、Ravi Kumar、Vipin K. Maikhuri
DOI:10.1016/j.molstruc.2023.136026
日期:2023.11
their photophysical properties has also been investigated. The structures of all the synthesized compounds were well characterized by using 1H NMR, 13C NMR, IR, HRMS, and single crystal X-ray structure analysis. Detailed spectroscopic studies revealed that all the synthesized pyridocoumarins displayed acidochromic properties in solutions, which could be utilized as acid-base vapor sensors, and anti-counterfeiting
众所周知,吡啶香豆素由于其独特的光物理性质,在光电子学、荧光探针和传感器中表现出各种有效的应用。已经证明了一种简洁有效的方法可以通过相对便宜的磷酸催化波瓦罗夫反应合成吡啶香豆素,并且还研究了它们的光物理性质。所有合成化合物的结构均通过1 H NMR 得到了很好的表征,1313C NMR、IR、HRMS 和单晶 X 射线结构分析。详细的光谱研究表明,所有合成的吡啶香豆素在溶液中均表现出酸变色特性,可用作酸碱蒸气传感器和防伪剂。还计算了所有合成酸传感器的检测限,结果发现其范围在 41-103.8 ppm(百万分之一)范围内。还进行了 DFT 和 TDDFT 研究,以了解这些化合物中涉及的质子化位点和电子跃迁。合成的吡啶香豆素的HOMO-LUMO能隙范围为3.50-3.90 eV。