基于三联吡啶衍生物的Fe~(2+)/Fe~(3+)化学比色敏感器

合成和表征了一种新的化合物(E)-4-′(4-(2-(2-萘)乙烯基)苯基)-2,2′:6′,2″-三联吡啶L.用Fe2+或Fe3+来滴定时,L的溶液(三氯甲烷和乙醇的体积比为1∶20)颜色分别从无色变成洋红色和橙红色,相应的紫外可见吸收光谱都在374和574 nm出现特征吸收峰.此外,即使存在其它过量金属阳离子时,L对Fe2+或Fe3+离子仍然表现出很强的敏感性和选择性.另外,还研究了L对Fe2+或Fe3+离子及两者共同存在时的线性检测浓度范围和最低检测极限(LOD).

Goodall W, Williams J A G. A new, highly fluorescent terpyridine which responds to zinc ions with a large red-shift in emission[J]. Chem. Commun., 2001, 23: 2514-2515. A Highly Sensitive Colorimetric Chemosensor for Iron (II) and Iron (III) Ions

In this work a new compound(E)-4′-(4-(2-(2-naphthalenyl)vinyl)phenyl)-2,2′:6′,2″-terpyridine L was synthesized,characterized and used to recognize iron ions.Upon addition of Fe(II) or Fe(III),the solution(V(CHCl3)∶V(ethanol)=1∶20) of L can show magenta or orange-red color in visible region,respectively.And in the UV-vis spectrum of L in solution there emerge two characteristic peaks at 374 and 574 nm.Furthermore,the response of L to iron ions is highly sensitive and selective even though in the presence of other metal ions.The limit of detection(LOD) and linear concentration range for iron(II)/iron(III) and iron(II+III) were studied,too.