Herein, we developed and designed a novel ratiometric optical chemisensor film for determining Al(III) and Cu(II) in low concentration ranges. The chemisensor film consists of (a) antibacterial drug Ciprofloxacin (CPFX) [1-cyclopropyl-6-fluoro1,4-dihydro-4-oxo-7-(piperaziny-l-yl) quinolone-3carboxylic acid] and (b) a reference dye 5,10,15,20- tetrakis (pentafluorophenyl) porphyrin (TFPP) in a polyvinyl chloride (PVC) matrix. PVC was applied as a homogeneous system for mixing CPFX and TFPP. The emission intensity of the CPFX in the PVC matrix varies depending on the concentrations of the Al(III) and Cu(II) ions. When the sensor film is immersed in different Al(III) concentrations, a significant fluorescence enhancement of the CPFX at (427 nm) is observed. Furthermore, the fluorescence intensity of the red emission of the TFPP dye at (644 nm) does not alter. However, in the presence of Cu(II) ions, a considerable emission quenching of the CPFX peak at (427 nm) is observed. PVC provides a great permeability and penetration facilities of dissolved ions that make the sensor film sensitive to Al(III) or Cu(II) changes outside the matrix. The film displays immense sensitivity depending on their distinctive optical characteristics of CPFX and detection capabilities within a low detection limit LOD for Al(III) and Cu(II). The LOD values were estimated to be 2.05 x 10⁻⁷ M and 1.04 x 10⁻⁷ M respectively with a relative standard deviation RSD_r (1%, n=3). Density functional theory (DFT) and the time-dependent DFT (TDDFT) theoretical calculations were performed to study Cu(II) and Al(III) complexation structures and their electronic properties in solution and in the sensor film. The interference of the chemisensor film was examined using different cations and the chemisensor provides significant selectivity. We develop a new ratiometric chemisensor based on PVC polymer film for Al(III) and Cu(II) detection.

在这里，我们开发和设计了一种新颖的比率式光学化学传感器薄膜，用于测定低浓度范围内的Al（III）和Cu（II）。化学传感器膜由（a）抗菌药物环丙沙星（CPFX）[1-环丙基-6-氟代1,4-二氢-4-氧代-7-（哌嗪基-1-基）喹诺酮-3羧酸]和（b）a聚氯乙烯（PVC）基质中的参考染料5,10,15,20-四（五氟苯基）卟啉（TFPP）。PVC被用作混合CPFX和TFPP的均匀体系。PVC基体中CPFX的发射强度随Al（III）和Cu（II）离子的浓度而变化。当传感器膜浸入不同的Al（III）浓度时，在（427 nm）处观察到CPFX的荧光增强效果明显。此外，TFPP染料在（644 nm）处红色发射的荧光强度不变。但是，在存在Cu（II）离子的情况下，观察到CPFX峰在（427 nm）处有相当大的发射猝灭。PVC提供了很好的溶解离子渗透性和渗透性，使传感器膜对基体外部的Al（III）或Cu（II）变化敏感。该膜根据其独特的CPFX光学特性和在Al（III）和Cu（II）的低检测限LOD内的检测能力，显示出极高的灵敏度。LOD值估计为2.05 x 10 PVC提供了很好的溶解离子渗透性和渗透性，使传感器膜对基体外部的Al（III）或Cu（II）变化敏感。该膜根据其独特的CPFX光学特性和在Al（III）和Cu（II）的低检测限LOD内的检测能力，显示出极高的灵敏度。LOD值估计为2.05 x 10 PVC提供了很好的溶解离子渗透性和渗透性，使传感器膜对基体外部的Al（III）或Cu（II）变化敏感。该膜根据其独特的CPFX光学特性和在Al（III）和Cu（II）的低检测限LOD内的检测能力，显示出极高的灵敏度。LOD值估计为2.05 x 10^-7  M和1.04 x 10 ^-7  M分别具有相对标准偏差RSD _r（1％，n = 3）。进行了密度泛函理论（DFT）和时变DFT（TDDFT）理论计算，以研究溶液和传感器膜中的Cu（II）和Al（III）络合结构及其电子性质。使用不同的阳离子检查了化学传感器膜的干扰，化学传感器提供了显着的选择性。我们开发了一种基于PVC聚合物薄膜的新型比例化学传感器，用于Al（III）和Cu（II）检测。