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Novel Iron(III)-Based Metal–Organic Gels with Superior Catalytic Performance toward Luminol Chemiluminescence
journal contribution
posted on 2017-08-29, 00:00 authored by Li He, Zhe Wei Peng, Zhong Wei Jiang, Xue Qian Tang, Cheng Zhi Huang, Yuan Fang LiNovel metal–organic gels (MOGs)
consisting of iron (Fe3+) as the central ion and 1,10-phenanthroline-2,9-dicarboxylic
acid (PDA) as the ligand were synthesized by a mild facile strategy.
The Fe(III)-containing metal–organic xerogels (Fe–MOXs),
obtained after removing the solvents in MOGs, were found to exhibit
outstanding performance in the catalysis of luminol chemiluminescence
(CL) for the first time even in the absence of extra oxidants such
as hydrogen peroxide. The possible CL mechanism was discussed according
to the electro/optical measurements, including electron paramagnetic
resonance (EPR), UV–vis absorption, and CL spectra, as well
as the effects of radical scavengers on Fe–MOXs-catalyzed luminol
CL system, suggesting that the CL emission of luminol might originate
from the intrinsic oxidase-like catalytic activity of Fe–MOXs
on the decomposition of dissolved oxygen. Additionally, the potential
practical application of the resulting luminol–Fe–MOXs
system was evaluated by the quantitative analysis of dopamine. Good
linearity over the range from 0.05 to 0.6 μM was obtained with
the limit of detection (LOD, 3σ) of 20.4 nM and acceptable recoveries
ranging from 98.6 to 105.4% in human urine. These results may open
up the promising application of novel metal–organic gels as
highly effective catalysts in the field of chemiluminescence.