Facile and Large-Scale Syntheses of Nanocrystal Rare Earth Metal–Organic Frameworks at Room Temperature and Their Photoluminescence Properties

Abstract

The treatment of Ln(NO 3 ) 3 Á6H 2 O (Ln = La, Ce, Eu, Gd, Dy) with 1,3,5-benzenetricarboxylic acid (H 3 BTC) in a water-ethanol solution facilely yields crystal nanorods of rare earth metal-organic frameworks (MOFs) at room temperature. Electron micrographs show that the nanorods are 50-200 nm in width, 50-100 nm in thickness and 1-2 lm in length. All the crystal nanorods have the same Ln(BTC)(H 2 O) 6 structure as identified by power X-ray diffraction, elemental analysis, thermogravimetric and Fourier transform infrared analysis. The optical properties of all the compounds are recorded; and, the nanoscale MOFs (NMOFs) with Eu 3? and Dy 3? show excellent photoluminescence.

Ultrasound-Assisted Synthesis of Luminescent Micro- and Nanocrystalline Eu-Based MOFs as Luminescent Probes for Heavy Metal Ions

“…Nanosized luminescent MOFs are able to penetrate the cell membrane and are therefore used in bioimaging as luminescent probes [13,14]. The nano-sized rare-earth-based MOFs can be synthesized by several synthetic routes [13,14,[22][23][24][25] such as solvothermal, reverse Nanomaterials 2021, 11, 2448 2 of 14 microemulsion, surfactant-assisted, microwave, and ultrasonic methods. The resulting small-sized particles usually have sizes from 40 to 5000 nm.…”

One-step growth of isoreticular luminescent metal–organic frameworks on cotton fibers

“…The absence of a band at 1720 cm À1 , associated with carboxylic acid, is also an evidence of full deprotonation of H 3 BTC. 35 Fig. 7b indicates the spectra of Ln-MOFs grown on cotton samples with clean cotton fabric shown as control.…”

“…This type of anisotropic growth of the Ln-MOFs is in agreement with the previous reports. 35 Structures of the resulting samples were analyzed by powder X-ray diffraction (PXRD). Fig.…”

Co‐Quenching Effect between Lanthanum Metal–Organic Frameworks Luminophore and Crystal Violet for Enhanced Electrochemiluminescence Gene Detection

“…[ 24,25 ] Likewise, aromatic polycarboxylate ligands are also a good choice for preparing MOFs‐based luminophore, which can not only serve as a chromophore in the coordinated frameworks, but also functionalize the surface of MOFs with abundant carboxyl groups for post‐modification application. [ 26 ] The combination of two is expected to possess each other's strengths. Given these considerations, through a facile water–ethanol phase method at room temperature, “LaMOFs” as the new ECL luminophores are discovered and built on a strong coordination and ordered fashion between the organic linkers (trimesic acid, BTC) and lanthanum metal centers (La 3+ ).…”