Safranin O-Functionalized Cuboid Mesoporous Silica Material for Fluorescent Sensing and Adsorption of Permanganate
Incorporation of dual functions, i.e., sensing and adsorption, into one single organic-inorganic hybrid material for detection and removal of toxic permanganate (MnO4‒) ions is of great importance, representing a challenging and new task in the design and application of new functional materials. However, most of the reported materials display only one function as either sensing probes or adsorbents. In this work, a fluorescent cuboid mesoporous silica-based hybrid material (SiO2@SFNO) is first prepared by covalent coupling of a new safranin O-based fluorophore (2,8-dimethyl-5-phenyl-3,7-bis(3-(3-(triethoxysilyl)propyl)ureido)phenazin-5-ium chloride) (SFNO) and newly-made cuboid mesoporous silica, which showed selective dual-functional activities towards MnO4‒ and green emission at 575 nm with long-range excitation wavelength that is suitable for bio-imaging application. The design of this SiO2@SFNO based on the position of –NHCONH‒ groups which are mainly responsible for strong coordination with MnO4‒ selectively. SiO2@SFNO is responsive to MnO4‒ at parts per billion (67 ppb) level; it also displays high adsorption ability (292 mg/g) to MnO4‒ in aqueous solutions. The fluorescence responses of MnO4‒ in vivo (limnodrilus claparedianus and zebrafish) demonstrate the possibility of further application in biology. Interestingly, this SiO2@SFNO material is also capable of monitoring trace amounts of Hg2+ and Cu2+ in living organisms, holding great potentials in bio-related applications.
- This article is part of the themed collection: Journal of Materials Chemistry B HOT Papers