Single-molecule magnets within polyoxometalate-based frameworks

Abstract

As an extension of our interest in polyoxometalates (POMs) and lanthanoids, we report the design and synthesis of two polyoxometalate-based frameworks under hydrothermal conditions; [Ho4(PDA)4(H2O)11][(SiO4)@W12O36]·8H2O (1) and [Tb4(PDA)4(H2O)12][(SiO4)@W12O36]·4H2O (2) (H2PDA...

Anticancer Drug Extraction from Plasma Samples Using Three-Dimensional Polyoxometalate-Based Supramolecular Frameworks as Sorbents

“…In our previous papers, we have described the synthesis of a number of POM-based multinuclear lanthanoid clusters by Keggin-type POMs and various N-heterocyclic multicarboxylic ligands which demonstrated intriguing topologies and interesting properties in luminescence, magnetism, photo/catalysis, and sorbents. − In this work, the development of the lanthanoid hybrid-based POM family and exploring the role of N-heterocyclic poly­(carboxylic acid)­s as a continuation of our earlier study, preorganized 1,10-phenanthroline-2,9-dicarboxylic acid (H 2 PDA) and 4-hydroxy-2,6-pyridinedicarboxylic acid (chelidamic acid) were used as organic ligands (Scheme ). In this article, four inorganic–organic hybrids based on the Keggin-type POM and lanthanoids are synthesized hydrothermally and characterized as H­{Na­(H 2 O) 3 [Gd­(PDA)­(H 2 O) 2 ] 3 [BW 12 O 40 ]}·4H 2 O ( 1 ), H­{Na­(H 2 O) 3 [Tb­(PDA)­(H 2 O) 2 ] 3 [BW 12 O 40 ]}·3H 2 O ( 2 ), H­{Na­(H 2 O) 3 [Er­(PDA)­(H 2 O) 3 ] 3 [BW 12 O 40 ]}·H 2 O ( 3 ) (PDA = 1,10-phenanthroline-2,9- dicarboxylate), and [Pr 3 (H 2 O) 13 (pydc–OH) 2 ]­[BW 12 O 40 ]·12H 2 O ( 4 ) (pydc–OH = 4-hydroxy-2,6-pyridinedicarboxylate).…”

N–N-Bridged Polynuclear POM-Based Coordination Polymers Based on a V-Type Ligand: Proton Conduction and Magnetism

“…In this context, metal ions and organic ligands are the primary considerations in the design and assembly of 2D POM-based polynuclear coordination polymers. Compared to both pure lanthanide compounds and those that simultaneously incorporate both lanthanide and transition-metal ions, − 2D POM-based transition-metal coordination polymers have seen remarkable advancements, and they present a feasible approach to achieve polynuclear building units using suitable organic ligands. , Nitrogen heterocyclic ligands, such as pyridine, triazole, imidazole, and their derivatives, which may exhibit rigidity or flexibility, have been widely used in the assembly of transition-metal coordination polymers owing to their diverse coordination modes and favorable coordination abilities. − Compared with imidazole or pyridine, triazole derivatives contain more donor sites to link with metal ions in different ways, which are conducive to increasing structural diversity. , Up to now, many studies have been carried out based on triazole derivatives, and many structures have been constructed from polynuclear subunits. ,,− Our group has also conducted work on the rigid V-type triazole derivative ligands and obtained a number of POM-based coordination polymers with various structures, exhibiting good proton conductivity performance and magnetism. , Notably, V-type N-donor ligands, which possess some flexibility to change the angles between the central ring and two outer arms, are the optimal choice in the assembly process of 2D POM-based transition-metal coordination polymers.…”

Designing diverse coordination modes for the covalent attachment of Wells–Dawson type polyoxometalate onto porphyrins

“…For this reason, porphyrins have been bonded covalently with fullerenes, carbon nanotubes, and other organic and inorganic compounds. [7][8][9][10] As POMs are a vast group of outstanding electron acceptors 11 and the negatively charged metallic oxides exhibit structural diversity, [12][13][14] marvelous redox potentiality, 15 and attain-able organic grafting, 16 they have promising usefulness in the fields of magnetism, 17,18 catalysis, 19,20 optics, 21,22 production and storage of energy, [23][24][25] and medicine. [26][27][28][29] The development of POMs and their hybrids with organic moieties have received considerable attention.…”