卤阴离子对锂离子荧光探针识别性能的影响

Impact of the Halo-anion on the Recognition Performance of Lithium Fluorescence Probe

研究了荧光探针化合物C35-Cyclen对多种碱土金属阳离子的识别性能,结果表明,其对Li+的识别效果最佳,同时发现卤阴离子的存在对阳离子荧光探针识别性能也有一定影响,其中F-、Cl-、Br-能够与阳离子协同调节化合物C35-Cyclen上的香豆素荧光基团之间的距离,从而削弱香豆素基团之间的π-π、C—H…π堆积作用,使其荧光增强;而I-呈现供电子的还原性,使化合物C35-Cyclen的荧光猝灭。

The recognition performance of the fluorescence probe C35-Cyclen has been investigated.The results showed that a variety of alkali metal ions,especial lithium cation could be identified by C35-Cyclen.The further studies showed that halide anion exhibited the impact on the identification performance of the lithium fluorescence probe.The halide anion（F^-、Cl^-、Br^-） and the cation（Li^＋） coregulated the distance among the coumarin groups which linked to the fluorescence probe C35-Cyclen,the π-π,C—H… π stacking interactions among the coumarin groups were weakened,so that the fluorescence intensity of C35-Cyclen increased.However,I-quenched the fluorescence of C35-Cyclen due to its strong electron donation.