Abstract A novel two-photon fluorescent probe (ZC-F2) for selective recognizing Zn2+ and Cd2+ was designed and synthesized. By tuning the intramolecular charge transfer (ICT), ZC-F2 can recognize Zn2+ and Cd2+ through different emission colors in acetonitrile, the detection limit of Zn2+ and Cd2+ are 11.25 nM and 1.80 nM respectively. Moreover, ZC-F2 exhibits strong two-photon fluorescence emission when being excited by a femtosecond laser in the range of 700–860 nm, and its two-photon absorption (TPA) cross-section is studied. The cell-imaging experiments show that ZC-F2 has high sensitivity to Zn2+ and Cd2+, indicating its potential applications in environmental and biological detection.

中文翻译：

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一种用于高效检测 Zn2+ 和 Cd2+ 离子的新型双光子荧光探针

摘要 设计合成了一种用于选择性识别Zn2+和Cd2+的新型双光子荧光探针(ZC-F2)。通过调节分子内电荷转移 (ICT)，ZC-F2 可以通过乙腈中不同的发光颜色识别 Zn2+ 和 Cd2+，Zn2+ 和 Cd2+ 的检测限分别为 11.25 nM 和 1.80 nM。此外，ZC-F2在被700-860 nm范围内的飞秒激光激发时表现出强烈的双光子荧光发射，并研究了其双光子吸收（TPA）截面。细胞成像实验表明，ZC-F2对Zn2+和Cd2+具有高灵敏度，表明其在环境和生物检测方面的潜在应用。