A Microporous Anionic Metal–Organic Framework for Sensing Luminescence of Lanthanide(III) Ions and Selective Absorption of Dyes by Ionic Exchange

Abstract

Herein, a novel anionic framework with primitive centered cubic (pcu) topology, [(CH3 )2 NH2 ]4 [(Zn4 dttz6 )Zn3 ]⋅15 DMF⋅4.5 H2 O, (IFMC-2; H3 dttz=4,5-di(1H-tetrazol-5-yl)-2H-1,2,3-triazole) was solvothermally isolated. A new example of a tetranuclear zinc cluster {Zn4 dttz6 } served as a secondary building unit in IFMC-2. Furthermore, the metal cluster was connected by Zn(II) ions to give rise to a 3D open microporous structure. The lanthanide(III)-loaded metal-organic framework (MOF) materials Ln(3+) @IFMC-2, were successfully prepared by using ion-exchange experiments owing to the anionic framework of IFMC-2. Moreover, the emission spectra of the as-prepared Ln(3+) @IFMC-2 were investigated, and the results suggested that IFMC-2 could be utilized as a potential luminescent probe toward different Ln(3+) ions. Additionally, the absorption ability of IFMC-2 toward ionic dyes was also performed. Cationic dyes can be absorbed, but not neutral and anionic dyes, thus indicating that IFMC-2 exhibits selective absorption toward cationic dyes. Furthermore, the cationic dyes can be gradually released in the presence of NaCl.

Synthesis and adsorption properties of [Cu(L)2(H2O)]H2[Cu(L)2(P2Mo5O23)]·4H2O/Fe3O4 nanocomposites

“…This means that the dye release is also an ion-exchange process, which also further demonstrate that ionic interaction between dyes and anionic framework is main determinant for selective adsorption and separation of dyes. 46 The new [Cu(L) 2 (H 2 O)]H 2 [Cu(L) 2 (P 2 Mo 5 O 23 )]$4H 2 O/Fe 3 O 4 nanocomposites have been successfully synthesized, and were adopted as adsorbents for the removal of dyes in aqueous solution. Interestingly, they not only exhibit rapid adsorption rate and high uptake capacity towards fuchsin basic, but also realize the recycling performance.…”

Post-synthetic ion-exchange process in nanoporous metal–organic frameworks; an effective way for modulating their structures and properties

“…Therefore, releasing the dyes were an ionexchange process in this study. 118 3.2.4 Luminescence properties. The IFMC-2 (85) MOF that was introduced beforehand can be also utilized as a potential luminescent probe towards different Ln 3+ ions.…”

5‐(3′,4′‐Dicarboxylphenoxy)isophthalate/5‐(2′,3′‐Dicarboxylphenoxy)isophthalate‐Based 3D Cadmium(II) Coordination Polymers: Synthesis, Structure, and Sensing of Nitrobenzene

“…[6] For example, 1) owing to the strongera bility to form clusters or 1D chains of carboxylate groups with metal ions, namely,s o-called discrete or rod-shaped secondary building units (SBUs), some metal-multicarboxylate CPs possess 3D stable porouss tructures, which have been confirmed as potentialc andidates for H 2 storage [7] and CO 2 capture. [8] Also owing to special porous structures, metal-multicarboxylate CPs are verifiedt ob ea ble to adsorbo rganic dyes [9] and reversibly takeu pI 2 molecules. [10] 2) Owing to the electron-rich nature of the aromatic multicarboxylate ligand (potentiale lectron donor), the excited-state electron-transfer path of the metal-multicarboxylate CP will be changed, upon encountering highly electron-withdrawing À NO 2 groups in nitroaromatics.…”