Novel Iron(III)-Based Metal–Organic Gels with Superior Catalytic Performance toward Luminol Chemiluminescence

Abstract

Novel metal-organic gels (MOGs) consisting of iron (Fe) 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.

A Copper Metal–Organic Hydrogel as a Catalyst for SO2 and CO2 Fixation under Ambient Conditions

“…In recent years, metal–organic gels (MOGs) have attracted a great deal of attention due to their potential application in sensing, molecular recognition, catalysis, drug delivery, and dye adsorption, Low molecular weight MOGs are formed due to various non‐covalent interactions which are responsible for the rapid self‐assembly process of the discrete metal complexes and formation of the microstructures where a significant amount of solvent molecules are entrapped inside the network. These weak non‐covalent interactions, as well as the microstructure, can be easily deformed through the external stimuli, and material can undergo the gel to sol transition or vice‐versa.…”

Luminescent Properties of Lanthanoid-Poly(Sodium Acrylate) Composites: Insights on the Interaction Mechanism

“…Metal-organic materials have received great attention in recent years, because of the metal-ligand interaction, which can form three-dimensional structures, such as metal-organic frameworks (MOF) and metal-organic gels (MOG); these materials have already presented promising applications for supercapacitors, sensing, catalysis and optoelectronics [1][2][3][4][5]. MOG preparation is simpler, involving hydrogen bonding interactions, π-π stacking, van der Waals forces and coordination bonds under mild conditions to form self-assembled supramolecular structures [6,7].…”

Metal‐Organic Gel‐Derived Co/CoO/Co3O4 Composite for the Electrochemical Detection of Diethylstilbestrol

“…Metal‐organic gel (MOG) is also called the coordination polymer gel, which is assembled by gelator to form gel network structure, and the metal‐ligand coordination bond, hydrogen bond, π‐π stacking, and van der Waals force are the mainly interaction manners . MOG materials have been broadly applied in the drug carrier, sensor, catalysis and luminescence field owning to the properties of good compatibility, stimuli‐responses, high surface areas, inherently present open metal sites and large channels . Moreover, the abundant exposed metal sites of MOG could as potential active center and easy accessibility to detect target, and it is possible to directly employ MOG as electrode material for the electrochemical analysis and detection .…”