Abstract：
A ligand, 2-phenylphthalazin-1(2H)-one (K), was synthesized by refluxing 2-formylbenzoic acid with phenyl hydrazine in presence of ethanol. FTIR, elemental analysis and single crystal XRD techniques were used to elucidate the structure. Fluorimetric turn-off response was recorded when solution of ligand (K) in DMF was treated with aqueous solution of Fe3+ and Fe2+ metal ions. No specific changes were observed on addition of other metal ions (Pb2+, Cd2+, Mn2+, Zn2+, Ba2+, Ni2+, Al3+, Ag1+, Co2+, Ca2+, Cu2+, Mg2+, Cr3+). Limit of Detection (LOD) was calculated for Fe2 and Fe3+as 2.4 µM and 2.5µM respectively, which is quite below to the recommended value 5.4 µM of the Environment Protection Agency of USA. Association constants for Fe3+ and Fe2+ metal ions were determined as 6 × 10-4 M-1 and 3.6 × 10-4 M-1 respectively. Benesi-Hildebrand plot confirmed 1:1 binding ratio between metal ions and ligand.
摘要：
配体，2-苯基酞嗪-1（2H）-酮（K），通过在乙醇存在下将2-甲酰基苯甲酸与苯肼回流合成。FTIR,元素分析和单晶XRD技术用于阐明结构。当配体(K)在DMF中的溶液用Fe3+和Fe2+金属离子的水溶液处理时,记录荧光测定关断响应。在添加其他金属离子（Pb2，Cd2+,Mn2+,Zn2+,Ba2+,Ni2+,Al3+,Ag1+,Co2+,Ca2+,Cu2+,Mg2+,Cr3+)。Fe2和Fe3+的检测限（LOD）分别计算为2.4µM和2.5µM，这大大低于美国环境保护局的建议值5.4µM。Fe3和Fe2金属离子的缔合常数分别确定为6×10-4M-1和3.6×10-4M-1。Benesi-Hildebrand图证实了金属离子和配体之间的1:1结合比。
