A metal–organic framework assembled from Y(iii), Li(i), and terephthalate: hydrothermal synthesis, crystal structure, thermal decomposition and topological studies

Abstract

A novel metal-organic framework assembled from Y(iii), Li(i), and terephthalate ligand, formulated as [LiY(BDC)2(H2O)·2(H2O)] (1) (H2BDC = terephthalic acid), has been obtained as single phase under hydrothermal conditions. The crystal structure was solved by single-crystal X-ray diffraction and the bulk was characterized by powder X-ray diffraction (PXRD), thermal analyses (TG-MS and DSC), vibrational spectroscopy (FTIR), scanning/transmission electron microscopy (SEM-EDX, TEM, SAED, and BF-STEM-EDX), and powder X-ray thermodiffractometry (HT-XRD). 1 crystallizes in monoclinic space group (P21/c, with a = 11.6415(7) Å, b = 16.0920(4) Å, c = 13.2243(8) Å and β = 132.23(1)°) and possesses a 3D framework with 1D trigonal channels running along the [101] direction containing water molecules. The structure of 1 is made up of unusual four-membered rings formed by edge- and vertex-shared {YO8} and {LiO4} polyhedra. The four-membered rings are isolated and connected to each other via carboxylate groups. HT-XRD reveals that 1 undergoes phase transformation upon the dehydration process which is a reversible process involving a spontaneous rehydration characterized by fast kinetics. Topological studies were also performed revealing that 1 has a new 2-nodal net.

Uncovering the Structural Diversity of Y(III) Naphthalene-2,6-Dicarboxylate MOFs Through Coordination Modulation

“…Tartaric acid has previously been shown to be an efficient modulator in the synthesis of a mixed metal Y-BDC MOF in a mixed EtOH/water solvent system (Abdelbaky et al, 2014), and so conditions (heating to 80°C for 24 h) inspired by this were implemented with Y 3+ and NDC 2− . Single crystals of [Y 2 (NDC) 3 (C 2 H 5 OH)(H 2 O) 3 ] n ·3(C 3 H 7 NO) (6) could be isolated from the resulting gel.…”

Metal–organic frameworks assembled from lanthanide and 2,5-pyridinedicaboxylate with cubane-like [Ln4(OH)4] building units

“…In continuation of our previous works concerning the synthesis and characterization of LOFs based on flexible [38], rigids [15,22], and rigid-flexible dicaboxylate ligands [16,18] Single-Crystal X-Ray Diffraction Studies. For 25pYb and 25pY-2 samples (not suitable single-crystal in the case of 25pY-1), data collection was performed at 293 K on an Agilent Gemini CCD diffractometer, using CuKĮ radiation.…”

“…Recently, much work has been focused on lanthanide-containing MOFs (LOFs) [14][15][16], because these compounds give rise to luminescence materials [17][18][19][20][21][22][23], with increased brightness and emission quantum yield [24,25], and therefore they could be very promising class of materials in a wide range of optical applications including fluorescent sensing [26][27][28], imaging contrast agents [29,30], and lighting and displays [31]. Many d-block transition metal cations prefer to be coordinated by soft donor atoms, whereas lanthanide cations (Ln 3+ ), with their high and variable coordination numbers and flexible coordination environments, have high affinity for hard donor atoms [32,33], and therefore leading to complex network topologies with promising potential applications.…”

Synthesis, Structures and Luminescence Properties of Metal-Organic Frameworks Based on Lithium-Lanthanide and Terephthalate

“…Moreover, they are promising candidates for replacing the conventional electrode in Li-ion batteries, exhibiting a high reversible specific capacity and excellent cyclability [55,56,57,58]. Many studies have been carried out using the hydrothermal route to prepare Ln–BDC [20,59,60,61] or alkali–BDC [62,63,64,65] based frameworks, while the first example of MOFs assembled from Li–Ln–BDC has been recently reported by us [12].…”