以黄酮冠醚金属配合物为基体的阴离子化学敏感器

合成了两种以新型黄酮类冠醚化合物(L)为配体的金属配合物Ca(L)]2+(1)或Mg(L)]2+(2).对其在乙腈溶液中与阴离子间的相互作用进行了研究.当这种化学敏感器和HSO4-或H2PO4-阴离子相互作用时,可观察到强烈的颜色变化.UV光谱滴定实验表明,配合物1(或2)和HSO4-间形成了1:1的稳定配合物.配合物1(或2)对于HSO4-或H2PO4-阴离子也可用荧光光谱法进行选择性检测,较UV方法有更高的灵敏度.还提出了配合物1(或2)与阴离子间通过两点结合方式,构成新的配合物可能结构的建议.通过色调变化和荧光测定的方法进行研究,结果表明,带有染料分子的金属配合物可用作为有效识别和检测阴离子的敏感器件.

An Anion Chemosensor Based on Flavone Quasi-crown Ether Metal Complex

A novel metal complex Ca(L)] 2+ (1)or Mg(L)] 2+ (2)] based on the flavone derivative with a quasi-crown ether(4′-(dimethylamino)-3,6-(tetraethylene glycol)flavone) was synthesized and studied as anion-binding receptors. Remarkable color change of host 1 or 2 induced by the complex formation with HSO4-(or H2PO4-) was observed. The UV-Vis spectroscopic titration experiments indicated the formation of 1:1 stable complexes between 1 or 2 and HSO4-. HSO4-(or H2PO4-) can also be selectively detected by the fluorescence method,which is even more sensitive than the UV-Vis spectroscopic method. The binding manner using double binding sites and possible structures formed between complex 1 or 2 and selected anions were proposed. The results showed the dye-containing metal complexes could act as the efficient and selective chromogenic and fluorescent reagents for anion sensing.