新型1,2,4-三唑重金属离子荧光淬灭剂的合成、表征与性能

为寻找快速显示重金属离子并生成沉淀去除的新型荧光淬灭剂,以4-氨基-3,5-二(2-羟基苯基)-1,2,4-三唑[NH2C2N3(C6H4OH)2]为配体,合成重金属(Co,Cr,Mn,Ni)配合物,通过IR,1H NMR,13C NMR,MS和元素分析等确认其配位方式和结构,并测试了配合物的热重、紫外和荧光淬灭性能.结果表明:此类金属配合物热稳定性较好,Mn和Ni配合物高温下分解为氧化物;配合物的紫外吸收强度较配体有所减弱;配体荧光与重金属离子配位后发生淬灭,说明重金属离子Co,Cr,Mn,Ni是1,2,4-三唑配体优良的荧光淬灭剂,可通过配位生成沉淀去除.

Synthesis, Characterization and Properties of Novel 1, 2, 4-Triazole Heavy Metal Ion Fluorescence Quencher

To find out a novel fluorescent quencher that may rapidly detect and remove heavy metal ions, a series of heavy metal (Co, Cr, Mn, Ni) complexes with 4-amino-3,5-bis (o-hydroxyphenyl)-1, 2, 4-triazole as ligand were synthesized. Their structures and coordination modes were confirmed by IR, ¹H NMR, ¹³C NMR, MS and element analysis. The TGA, ultraviolet spectra and fluorescence quenching properties were also discussed. The results showed these complexes had good thermal stability. The Mn and Ni complexes were decomposed into stable oxide at high temperatures. The UV absorption intensity of the complexes was weaker than that of the ligand. The fluorescence of ligand was quenched when the ligand was coordinated with metal ions, which indicated heavy metal ions (Co, Cr, Mn, Ni) are good fluorescence quenchers for 1, 2, 4-triazole ligand and could be removed as precipitate.