Clicking Fluoroionophores onto Mesoporous Silicas: A Universal Strategy toward Efficient Fluorescent Surface Sensors for Metal Ions

Abstract

Mesoporous SBA-15 silica is an excellent support for constructing fluorescent surface sensors. In this letter, we reported a two-step surface reaction involved strategy to construct efficient fluorescent surface sensors for metal ions by clicking fluoroionophores onto azide-functionalized SBA-15. Our experimental results indicate that such a strategy exhibits an obviously higher loading efficiency within commercial SBA-15 than a previously reported strategy. As a proof-of-concept, a newly designed alkyne-functionalized Hg(2+) fluoroionophore was grafted onto SBA-15 to form a fluorescent Hg(2+) surface sensor. It shows improved sensitivity and selectivity than the fluoroionophore itself working in the solution phase with a detection limit of 2.0 x 10(-8) M for Hg(2+).

Design and Synthesis of Novel Fluorescent Phthalimide Based Silatranes: Ratiometric Estimation of Mg2+ Ion

“…Compound 1 was then refluxed with tripodal ligands (L 1 ) and (L 2 ) in benzene under anhydrous conditions to afford the target compound 2 and 3. The chemical structures of synthesized compounds of 1-3 were confirmed by multinuclear ( 1 H, 13 C and 29 Si) NMR, ESI-MS and HRMS spectroscopic techniques. It was noteworthy that 1 H NMR spectra of compounds 2-3 at room temperature were quite different from their parent compound 1, which clearly indicates the presence of silatrane moiety.…”

“…Tris (2-hydroxy-3,5-dimethyl-benzyl)amine (L2) was prepared according to the published procedure [22]. 1 H NMR and 13 C NMR spectra were recorded on a Jeol AC 300 FT-NMR spectrometer (DMSO-d6/CDCl3). Chemical shifts were reported in ppm relative to δH 2.49 for DMSO-d6, δH 7.27 for CDCl3 and external tetramethylsilane (TMS).…”

Ratiometric glyco-probe for transient determination of thiophenol in full aqueous solution and river water

“…The target product KB5 was prepared by the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) [30e33] of azido b-D-galactoside 3 [34] with the alkynyl naphthalimide-dansyl dyad 2 which was obtained by amidation of 1 [35] with dansyl chloride in a twostep yield of 65% (Fig. 1).…”

Detection and Removal of Hg2+ Based on Mesoporous Silica Material Functionalized by Naphthalimide in Aqueous Solution

“…[9][10][11][12][13][14] However, these chemosensors were used in the homogeneous phase, which is not suitable for the separation, removal and enrichment of target species, or in rapid screening applications. [15][16][17][18] Mesoporous SBA-15 silica is an ideal inorganic scaffold for building organic-inorganic hybrid materials with considerable potential for many applications, such as catalysis [19][20][21][22] and drug delivery. 23,24 SBA-15 materials, themselves, are nonfluorescent, but they possess a high surface area with abundant hydroxyl groups on the pore walls, which can act as binding sites for the covalent grafting of fluorophores (organic compounds) on the silicon wall.…”