A "turn-on" lanthanide complex chemosensor for recognition of lead(ii) based on the formation of nanoparticles.
Benhua XuXiaoliang TangJi'an ZhouWanmin ChenHaile LiuZhenghua JuWeisheng LiuPublished in: Dalton transactions (Cambridge, England : 2003) (2018)
A functional amide-type pincer ligand was designed and synthesized, which could effectively capture Tb3+ ions to form a phosphorescence complex-based chemosensor Tb-1. The chemosensor could further coordinate with Pb2+ ions and display a turn-on phosphorescence response. This sensing process was analyzed in detail by steady-state luminescence spectroscopy, time-resolved luminescence spectroscopy, electron microscopy and dynamic light scattering, which suggest that the formation of Pb2+-induced hydroxide nanoclusters can adjust the optical signal of the external luminescence compound by embedment and fixation of Tb3+ complexes. Furthermore, Tb-1 could effectively eliminate the signal interference from the short-lived fluorescence and improve the signal-to-noise ratio to increase the accuracy of the detection for Pb2+. An understanding of the recognition mechanism of the Tb3+ complex-based chemosensor and the application of the characteristic spectra of lanthanide ions might be able to provide more opportunities to develop highly selective optical chemosensors.
Keyphrases
- aqueous solution
- energy transfer
- mycobacterium tuberculosis
- single molecule
- quantum dots
- high resolution
- sensitive detection
- living cells
- fluorescent probe
- electron microscopy
- room temperature
- heavy metals
- minimally invasive
- gold nanoparticles
- risk assessment
- loop mediated isothermal amplification
- metal organic framework
- solid state
- density functional theory
- ionic liquid