Organization and Energy Transfer of Fused Aromatic Hydrocarbon Guests within Anion‐Confining Nanochannel MOFs

Abstract

The self-assembly of Zn II ions with 1,3,5-tris(isonicotinoyloxyethyl)cyanurate produces new topological (4 2 ·12 4 ) 3 (4 3 ) 4 2D metal-organic frameworks (MOFs) with anion-confining cages.T he eclipsed assembly of each 2D MOF by p-p stackingo fc yanurate moieties (3.352(5) ) forms 3D MOFs consisting of nanochannels (10.5 ). Twoof the three anions are confined in each peanut-type cage, resulting in hydrophobicity of the nanochannels.T he hydrophobic nanochannel effectively adsorbs awide range of fused aromatic hydrocarbons (FAHs) as monomers or dimers, rendering it potentially highly useful as an energy-transfer material.

Modulating the optical properties of the AIE fluophor confined within UiO-66's nanochannels for chemical sensing

“…[21][22][23][24] The formation and functionalization of MOFs with a task-specific channel present interesting possibilities for tuning of guest conformations, guest preorganization, and unusual transition states. [25][26][27][28][29][30] Herein we demonstrate that confining AIE molecules within the nanochannels of MOFs is a powerful tool for modulating their fluorescence properties. pH-Dependent fluorescence emission AIE molecules (HDBB) were integrated into the nanochannels of UiO-66 by the host-guest process to investigate the AIE behaviors of AIE molecules under spatial constraint conditions.…”

Solvent-Modulated Emission Properties in a Superhydrophobic Oligo(p-phenyleneethynylene)-Based 3D Porous Supramolecular Framework

“…Luminescent materials have found widespread applications in sensors, light-emitting diodes, bioimaging, light harvesting, etc. , Porous luminescent metal–organic frameworks (MOFs) cover all of these applicative areas, with a host of other advantages. , In general, emission in MOFs can be realized by the lanthanide metal ions, π-chromophoric linkers, ligand-to-metal charge transfer, or metal-to-ligand charge transfer. , Furthermore, the permanent porosity of MOFs allows for the encapsulation of a variety of guest molecules, and this allows further modulation of the emission properties . This can arise because of either (a) inherent emission of the guest, (b) exciplex formation, (c) charge-transfer complex formation, or (d) structural changes induced by guest removal/encapsulation. − Structural modification occurs when the MOF structure distorts upon desolvation, leading to an emission different from that initially originating from the as-synthesized structure. Further, reversible tuning of this emission can occur when the solvent molecules recoordinate to the unsaturated metal center or occupy the pores of the MOFs.…”