Core‐Shell Structured Layered Lanthanide‐Organic Complexes with Stilbazolium‐type Dye Encapsulation for Multifunctional Performances

Abstract

Host-guest encapsulationo ff unctional organic dye into ap orousm etal-organic framework can give rise to the developmento fn ew functional materials. In this work, by intercalating the stilbazolium-type dye (DEAST)I (4'-diethylamino-N-methyl stilbazolium) into four lanthanide layered metal-organic complexes (Ln-LMOCs), i. e. (3), Er (4)), four responsive (DEAST)I@Ln-LMOCc omposites have been prepared, serving as multifunctional performance platform. The core-shell structures of (DEAST)I@Ln-LMOC composites have been fully characterizedb yI R, UV/Vis, PXRD, SEM, TEM, TGA and ESR. Significantly,a fter intercalation of dyes, the (DEAST)I@Ln-LMOC composites exhibit enhanced luminescent sensing properties in detecting Fe 3 + with much higherw ater stabilities. The luminescent sensing behavior stems from the fluorescencer esonance energy transfer (FRET) from the p-electron-rich BTB ligands to the Fe 3 + ,a nd their higher water stabilities are induced by electrostatici nteractions and lower porosity.S pecially,t he characteristic emissions of Sm 3 + will not be affected after the encapsulation guest dyes, which provideatheoretical guide for the modulation of luminescence devices.F inally,b etter ion conductivities andd iminished photocurrents can be achieved after the embedding of the functional organic dye. In all, the formation of (DEAST)I@Ln-LMOC composites with core-shell structures can be utilized as am ultifunctional platform with good stability.[a] L.

Down-Conversion Polymer Composite Coatings with Multipeak Absorption and Emission

“…It is worth emphasizing that the rare earth ions used in down-conversion materials have no obvious negative impact on the environment, and different rare earth ions can be selected according to different spectral control requirements. Among them, rare earth organic complexes are composed of lanthanide ions and organic ligands exhibit great luminescence properties and have high-efficiency absorption in ultraviolet (UV) region [17,18]. However, the photochemical stability of lanthanide complexes limits their application.…”

Anion Exchange on Surface Induces Drastic Fluorescence Response in Cu(II) Coordination Polymer Crystals

“…Generally, the ion transfer and exchange in CP crystals occur throughout the whole CP structure, i.e., from surface to inside the bulk material, , even in the case of three-dimensional (3D) blocks constructed via noncovalent interactions. − Therefore, the fluorescence response of most CP crystals has been studied based on the overall structure. − Some studies, however, have shown that fluorescence microscopy images could be used to reveal differences between the surface and the interior of CP crystal. , Accordingly, researching novel surface-controlled bulk properties of CP crystal has also attracted good attention. − In particular, studies on controlling the overall fluorescence properties through modulating the outer surface have focused on cation exchange and ligand modification. − For example, in the case of luminescent core–shell nanoparticles involving two different lanthanide complexes, the strong shielding effect of the surrounding shell that prevents excitation of the core was utilized to realize the selective emission of various parts of the crystal by judiciously selecting the excitation wavelength . For another example, the ligand exchange on the crystal surface forms a monolayer, allowing for the fabrication of a functional surface so as to achieve controlled gating or fluorescence sensing features .…”

Connectivity Replication of Neutral Eu3+- and Tb3+-Based Metal–Organic Frameworks (MOFs) from Anionic Cd2+-Based MOF Crystallites

“…In these SBUs, each Eu 3+ or Tb 3+ ion was associated with two chelating carboxylates, a pair of chelating–bridging carboxylates in a complementary fashion, and two H 2 O solvates. It is also notable that this double-deckered structure resembles those found in {[Ln­(BTB)­(H 2 O) 2 ]·3DMF·2H 2 O} n (Ln = La, Nd, Sm, Er) and other 2D (6,3) networks sustained by linear trinuclear SBUs. − Looking along the c direction, one can observe 1D channels with hexagonal apertures (Figure b).…”