The complexation of flavone derivatives with alkali and alkaline earth metal cations studied by spectroscopic methods
作者:Huaping Li、Hongzhi Xie、Penfei Wang、Shikang Wu
DOI:10.1039/a904825a
日期:——
A new kind of fluoroionophore, typified by flavone quasi-crown ether [4′-(dimethylamino)-3,6-(tetraethylene glycol)flavone] and flavone lariat-crown ether, were synthesized and characterized. The photophysical changes upon complexation with alkali and alkalineearthmetal cations are explained in terms of the enhancement of a cation-induced intramolecular charge transfer process, which results from
The thiolariat ether, which is a lariat ether with an oxygen atom in the side arm replaced by a sulfur atom, exhibits a high selectivity to silver ion among alkali and heavy metal ions because of synergistic ligation of the crown ether and the one sulfur outside the ring.