以黄酮冠醚金属配合物为基体的阴离子化学敏感器

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

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 HSO- 4或 H2 PO- 4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 HSO- 4间形成了 1∶ 1的稳定配合物 .配合物 1 (或 2 )对于HSO- 4或H2 PO- 4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 。

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 HSO - 4(or H 2PO - 4) was observed. The UV-Vis spectroscopic titration experiments indicated the formation of 1∶1 stable complexes between 1 or 2 and HSO - 4. HSO - 4(or H 2PO - 4) 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.