A new cyclodextrin deruvatiive (DMAC-CD) was prepared by linking a chalcone moiety to the 6--C position of β-cyclodextrin with an aza -- oxa---alkyl chain. The interaction between DMAC-CD and transitional metal ions were studied by steady state and time ---- resolved fluorescence spectroscopy. The experimental results showed that the complexes of DMAC-CD with metal ions were formed in the aqueous solution due to its self --inclusion conformation, which was in favor of binding metal ions. For this reson, the quenching curve of different metal ions for DMAC-CD all deviated from the stern -Volmer linear relationship owing to the steady state quenching mechanism. The stability constants and fluorescence quenching rate constants were bioth determined, indicating this chalcone ----modified cyclodextrin has a higher sensitivity and selectivity for transitional metal ions, especially for Cu^2+.

Key words: CHALCONE, CYCLODEXTRIN, PHOTOINDUCED, CHARGE TRANSFER, FLUOROSPECTROPHOTOMETRY