A dual-emission porphyrin coordination polymer for ratiometric fluorescent sensing of pH and copper ion
DYES AND PIGMENTS(2022)
摘要
Synthesis of nano coordination polymers (NCPs) with dual fluorescence emission is highly desirable, but is still a challenge for further ratiometric sensing applications. In this work, porphyrin-based NCPs with dual fluorescence emission were prepared via a solvothermal process using branched polyethyleneimine (PEI) as passivation agent for ratiometric fluorescent sensing of pH and copper ion. Two NCPs@PEI can be obtained with different fluorescence emissions due to regulation of reaction time. NCPs@PEI-1 exhibited a good fluorescence response to pH with a calibration function of lg(I-655 /I-477) = 0.2750 (pH) -2.2989 (R-2 = 0.977), derived from protonation and deprotonation of pyrrolic nitrogen and amino groups in the NCPs@PEI. Moreover, by exploiting the electron transfer between Cu2+ and nitrogen in porphyrin, NCPs@PEI-1 was used as sensor for detecting Cu2+ with a function of y =-0.0074x + 0.5990 (R-2 = 0.999) and the limit of detection was calculated to be 136 nM based on 3 sigma/kappa. These NCPs with tunable emission, excellent fluorescence, and "two in one " characteristic for Cu2+ and pH sensing highlights NCPs@PEI as a potential fluorescent probe for multi-target analysis.
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关键词
Porphyrin, Fluorescence, Ratiometric, Coordination polymer, pH sensing, Copper ion detection
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