Ratiometric and selective fluorescent sensor for CuII based on internal charge transfer (ICT).

@article{Xu2005RatiometricAS,
  title={Ratiometric and selective fluorescent sensor for CuII based on internal charge transfer (ICT).},
  author={Zhaochao Xu and Yi Xiao and Xuhong Qian and Jingnan Cui and Dawei Cui},
  journal={Organic letters},
  year={2005},
  volume={7 5},
  pages={889-92}
}
A Cu(II)-sensing, ratiometric, and selective fluorescent sensor 1, N-butyl-4,5-di[(pyridin-2-ylmethyl)amino]-1,8-naphthalimide, was designed and synthesized on the basis of the mechanism of internal charge transfer (ICT). In aqueous ethanol solutions of 1, the presence of Cu(II) induces the formation of a 1:1 metal-ligand complex, which exhibits a strong, increasing fluorescent emission centered at 475 nm at the expense of the fluorescent emission of 1 centered at 525 nm. [structure: see text] 

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