The binding constant (K) of PPPC with Fe3+ was calculated to be 5.1 × 10−2 M and 6.1 × 10−2 M from Benesi-Hildebrand plot using UV–vis and fluorescence spectrophotometer respectively. The detection limit of PPPC for Fe3+ was further determined as 57 nM and 88 nM by UV–vis and fluorescence titrations. Moreover, the binding mechanism of Fe3+ with PPPC was confirmed by DFT study.
设计了一种新型的基于
吡啶-
吡唑的“关”型荧光
化学传感器,即5-N-(
吡啶-2-基)-3-(
吡啶-4-基)-1H-
吡唑-5-羧酰胺(PPPC),合成,并通过NMR,ESI-MS和FT-IR光谱技术很好地表征。紫外可见吸收和荧光光谱研究表明,PPPC对
DMSO / H 2 O溶液(9:1,v / v)中的Fe 3+离子具有比其他
金属离子更高的选择性和敏感性。的结合常数(K)PPPC为Fe 3+被计算为5.1×10 -2 M和6.1×10 -2分别使用UV-vis和荧光分光光度计米Benesi-希尔德布兰德图。的检出限通过紫外-可见光和荧光滴定法进一步测定了Fe 3+的PPPC为57 nM和88 nM。此外,通过DFT研究证实了Fe 3+与PPPC的结合机理。