A Dual-Emission Amphiphile /Dye Modified Mesoporous Silica as Fluorescent Sensor for the Detection of Fe³⁺, Cr³⁺and Al³⁺

Abstract

A hybrid mesoporous silica with dual‐emission property is prepared. Amphiphilic quinolone (AQ) molecules are synthesized as the structure directing agent to help construct the mesopores, while the silane derived porphyrin (TPP) molecules are anchored on the silica skeleton. The hybrid silica has a disordered pore structure with its pore diameter and surface area of 2.3 nm and 1412 m2 g−1, respectively. The hybrid material is sensitive to trivalence metal ions. It emits a red fluorescence at 650 nm before it meets metal ions. Fe3+, Cr3+ and Al3+ ions can induce 25 to 48 times increase of the green light emission intensity of the material, while Fe3+ can quench the red fluorescence of porphyrin. The change of the dual‐emission can be observed by naked eyes, meaning that the Fe3+, Cr3+ and Al3+ can be easily distinguished. The hybrid silica also shows low detection limits to trivalence metal ions, which are 8×10−5, 10−4, and 2×10−4 mol L−1, respectively. Furthermore, the dual‐emission material can serve as a three‐in AND‐OR gate for the logic system.

Modulating the Sensing Behavior of Functionalized Mesoporous Silica towards Metal Ions in Aqueous Medium

“…It was employed for living cell imaging studies using HeLa cells. A mesoporous silica incorporated with both quinolone and porphyrin was reported for detection of Al 3+ , Cr 3+ and Fe 3+ ions in ethanol/water (v/v=2 : 1) (Entry 6) [53] . The fluorescence intensity of the probe was found to increase with these cations upon their interaction with quinolone part.…”

8‐Hydroxyquinoline Fluorophore for Sensing of Metal Ions and Anions

“…Two fluorescent probes, quinolone and porphyrin 82 ( Figure 80) were integrated into the same mesoporous silica material for sensing of Cr 3 + , Fe 3 + and Al 3 + ions. [110] The Fluorescence intensity has been enhanced from 25 to 48 times at 10 À 3 mol L À 1 cation concentration when probe 82 has been interacted with Al 3 + , Fe 3 + and Cr 3 + ions. Al 3 + ions exhibited maximum enhancement in fluorescence on interacting with quinolone that is about twice of Cr 3 + and Fe 3 + .…”

“…Two fluorescent probes, quinolone and porphyrin 82 (Figure 80) were integrated into the same mesoporous silica material for sensing of Cr 3+ , Fe 3+ and Al 3+ ions [110] . The fluorescent probe has two new fluorescence peaks at the wavelengths of 650 and 710 nm when excited at 365 nm.…”

Essential Guide of Analysis Methods Applied to Silver Complexes with Antibacterial Quinolones

“…The ability of quinolones to coordinate metal ions has been harnessed firstly, in the analyses of pharmaceuticals, biological and food samples. Analysis protocols that have been published comprise different methods such as spectrophotometry, 25 - 30 spectrofluorimetry, 31 - 34 chemiluminescence, 35 , 36 atomic absorption spectrometry, 28 flow injection and high-performance liquid chromatography. 37 - 39 …”