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A luminescent lanthanide coordination polymer based on energy transfer from metal to metal for hydrogen peroxide detection

Zeng, Hui-Hui, Zhang, Li, Rong, Lian-Qing, Liang, Ru-Ping, Qiu, Jian-Ding
Biosensors & bioelectronics 2017 v.89 pp. 721-727
absorption, adenosine triphosphate, adsorption, biocompatibility, biosensors, cerium, coordination polymers, detection limit, energy transfer, fluorescence, glucose, glucose oxidase, hydrogen peroxide, ligands, nanoparticles, oxidation, oxygen
A bimetal lanthanide coordination polymer nanoparticle (ATP-Ce/Tb-Tris CPNs) with good biocompatibility was synthesized in Tris–HCl buffer using adenosine triphosphate (ATP) molecules as the bridge ligands. The large absorption cross section and suitable emission energy of Ce³⁺ matching to the adsorption energy of Tb³⁺(⁴fn) results in the efficient energy transfer from Ce³⁺ to Tb³⁺, thus the synthesized ATP-Ce/Tb-Tris CPNs exhibit the characteristic green emission of Tb³⁺. Such energy transfer from metal to metal in fluorescent lanthanide coordination polymer nanoparticles (Ln-CPNs) has been demonstrated. It is found that the oxidation of Ce³⁺ in ATP-Ce/Tb-Tris CNPs to Ce⁴⁺ would interrupt the energy transfer from Ce³⁺ to Tb³⁺, leading to fluorescence quenching of Tb³⁺. On the basis of this quenching mechanism, ATP-Ce/Tb-Tris CPNs has been successfully used to detect reactive oxygen H2O2 with detection limit as low as 2nM. If glucose oxidase is present in the system, glucose can be determined using the ATP-Ce/Tb-Tris CNPs nanosensor.