高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (2): 232.doi: 10.7503/cjcu20150563

• 分析化学 • 上一篇    下一篇

基于1,8-萘酰亚胺与罗丹明B间荧光共振能量转移的高选择性Hg2+比率荧光探针

陈家逸, 苏伟, 王恩举()   

  1. 海南师范大学化学与化工学院, 海口 571158
  • 收稿日期:2015-07-20 出版日期:2016-02-10 发布日期:2015-12-26
  • 作者简介:联系人简介: 王恩举, 男, 博士, 教授, 主要从事荧光传感方面的研究. E-mail:enjuwang@163.com
  • 基金资助:
    国家自然科学基金(批准号: 21162010)资助

Highly Selective Ratiometric Fluorescent Probe for Hg2+Based on Fluorescence Resonance Energy Transfer Between 1,8-Naphthalimide and Rhodamine B

CHEN Jiayi, SU Wei, WANG Enju*()   

  1. School of Chemistry & Chemical Engineering, Hainan Normal University, Haikou 571158, China
  • Received:2015-07-20 Online:2016-02-10 Published:2015-12-26
  • Contact: WANG Enju E-mail:enjuwang@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21162010)

摘要:

以罗丹明B与1,8-萘二甲酰亚胺反应合成了1个高选择性Hg2+比率荧光探针(RN). 在甲醇/乙腈/4-羟基哌嗪乙磺酸缓冲溶液(pH=7.2, 体积比8:1:1)中, RN对Hg2+具有比色和比率荧光双重响应. 加入Hg2+后, RN的紫外-可见光谱在约556 nm处产生强吸收, 溶液由浅绿色变为橙色, 其它金属离子对RN的紫外-可见光谱几乎无影响. 无Hg2+存在时, RN的荧光光谱在540 nm处出现萘二甲酰亚胺荧光团的特征峰; 加入Hg2+后, 540 nm处的发射带逐渐消失, 同时在580 nm附近产生强荧光, 荧光颜色从绿色变为橙色. 这归因于从萘酰亚胺到开环罗丹明B的荧光共振能量转移(FRET), 探针RN对Hg2+的比率荧光响应具有高选择性, 不受其它共存金属离子的干扰.

关键词: 罗丹明B, 1,8-萘二甲酰亚胺, 荧光共振能量转移, Hg2+, 比率荧光探针

Abstract:

A ratiometric fluorescent probe(RN) was developed based on rhodamine B and 1,8-naphthalimide which were linked together by an amido linkage. In CH3OH/CH3CN/HEPES buffer solution(pH=7.2), free RN showed absorption maximum at 412 nm. The presence of Hg2+ could induce an intensive absorption at 556 nm. The change of absorption spectrum resulted in a color change from light green to orange in response to Hg2+. Significantly, the probe RN gave rise to a ratiometric fluorescent response to Hg2+. Upon the addition of Hg2+, a significant fluorescence enhancement at 580 nm and meanwhile the gradual disappearance of the emission at 540 nm were observed, which were ascribed to the fluorescence resonance energy transfer(FRET) from 1,8-naphthalimide moiety to the ring-opened rhodamine B moiety. Accompanying the change of fluorescence spectra, the significant fluorescence color changed from green to orange occurred, which could be used for naked-eye detection of Hg2+. The ratiometric fluorescence signal for Hg2+ was not affected by other coexisting mental ions.

Key words: Rhodamine B, 1,8-Naphthalimide, Fluorescence resonance energy transfer, Hg2+, Ratiometric fluorescent probe

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