Dash Sushree Suman, Kar Pravin Kumar, Bhaskaran Renjith
Department of Chemistry, Veer Surendra Sai University of Technology, Burla, Sambalpur, 768018, Odisha, India.
Department of Chemistry, Madanapalle Institute of Technology & Science, Kadiri Road, Angallu, Madanapalle, 517325, Annamayya District, Andhra Pradesh, India.
J Fluoresc. 2025 Sep 13. doi: 10.1007/s10895-025-04536-z.
Schiff Base sensor (E)-3-(((3',6'-bis(diethylamino)spiro[isoindoline-1,9'-xanthen]-2-yl)imino)methyl)naphthalen-2-ol (SBRB2) was conceived and produced by employing a new Rhodamine functionalization. The ability of the sensor SBRB2 to detect Cu(II) was studied using fluorescence and UV-Vis spectroscopy. The sensor SBRB2 indicated sensitivity and specific selectivity to Cu(II) among other competitive metal ions based on fluorescence studies. A new emission peak appeared at 580 nm only in the presence of Cu(II). The chelation of the ligand with Cu (II) was responsible for the sensitivity to Cu (II). The binding constant and detection limit of the SBRB2: Cu (II) complex were found by the fluorescence titration to be 1.18 × 10 M and 3.03 × 10 M, respectively. It showed the 1:1 complexation between SBRB2 and Cu (II) was conformed from the DFT and TD-DFT study of SBRB2 in both solvent and gas phase.
席夫碱传感器（E）-3-（（（3'，6'-双（二乙氨基）螺[异吲哚啉-1,9'-呫吨]-2-基）亚氨基）甲基）萘-2-醇（SBRB2）是通过采用一种新的罗丹明功能化设计并制备的。使用荧光光谱和紫外可见光谱研究了传感器SBRB2检测铜（II）的能力。基于荧光研究，传感器SBRB2在其他竞争性金属离子中对铜（II）表现出灵敏度和特异性选择性。仅在铜（II）存在下，在580 nm处出现一个新的发射峰。配体与铜（II）的螯合作用导致了对铜（II）的灵敏度。通过荧光滴定法测得SBRB2：铜（II）配合物的结合常数和检测限分别为1.18×10 M和3.03×10 M。从SBRB2在溶剂和气相中的密度泛函理论（DFT）和含时密度泛函理论（TD-DFT）研究证实了SBRB2与铜（II）之间形成了1:1的配合物。
