Abstract
Electrochemiluminescence of lanthanide coordination polymers (LCPs) has drawn researchers' torrential interest attributed to their congenital standout optical properties. Herein, a novel electrochemiluminescent (ECL) emitter LCPs Tb-norfloxacin (Tb-NFX) was firstly reported, which originated from that NFX transferred excited state energy to Tb3+ by chelating antenna effect. Moreover, a creative ratiometric ECL biosensor was established based on an emerging pendant antenna effect mechanism between luminol and Tb-NFX. Specifically, Tb-NFX was immobilized on the electrode surface and SiO2 nanostars@luminol was introduced onto the immunosensor by the sandwich-typed immunoassay. In view of this, the luminol transferred energy to the Tb-NFX and potential resolved ratiometric strategy was implemented for self-calibrated assay target. This work innovatively demonstrates that the development of new ECL luminophores through chelating antenna effect and the establishment of a dual-potential ECL ratio measurement strategy powered by pendant antenna effect are feasible, further extending the application of LCPs in ECL immunoassays and provides new directions for the construction of ECL ratio pairs.
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