A rare 4-connected neb-type 3D chiral polyoxometalate framework based on {KNb₂₄O₇₂} clusters

Abstract

A rare 3D porous chiral polyoxoniobate framework, [Cu(en)2(H2O)]2{[Cu(en)]4[Cu(en)2]5 {[Cu(en)2KNb24O72H10]2}.6en.70H2O(1) (en=ethylenediamine) based on two types of isomeric {Cu(en)2KNb24O72H10} clusters (α-CuKNb24 and β-CuKNb24) has been synthesized by hydrothermal reaction. Interestingly, the α-CuKNb24...

Controlled Assembly of a Dawson-like Antimoniotungstate-Supported Trefoil-type Trimer with Good Proton Conductivity Performance

“…As a significant class of proton-conductive materials, heteropolyoxometalates have been widely applied in electron devices due to their small effective negative surface charge density. , Based on the results of the water adsorption isotherm, compound 1 could absorb 177 cm 3 water molecules at p / p 0 = 0.8, which indicated that Dawson-type compound 1 has good capacity of water absorption. It is not strange for POM-based conductive materials , (Figure e). Moreover, the PXRD pattern after test has shown the structural stability of compound 1 (Figure S11b).…”

State-of-the-art advances in the syntheses, structures, and applications of polyoxometalate-based metal–organic frameworks

“…144 While recent reports have shown that the [Nb24O72] 24-unit is suitable to serve as an effective BB for constructing PON-based MOFs. Some ground-breaking PON-MOFs assembled from [Nb24O72] 24-BBs were resoundingly synthesized by Nyman, Niu, Wang, Zheng, et al [145][146][147][148][149] With the development of science and technology, it is confirmedly believed that much more POM-MOFs based on infrequent POM BBs are prepared to enrich the treasury of POM-MOF chemistry. 150,151 On the basis of above-mentioned representative examples, it is corroborated that diverse POM BBs, versatile organic ligands and functional metal cations are the key factors in the preparations of novel PMOFs.…”

Hexnuclear, octanuclear, dodecanuclear, and hexadecnuclear polyoxomolybdenum(v)-based porous materials for selective adsorption of gases

“…4 Polyoxometalates as building blocks have specific topological and chemical information that can be transferred to the final products to achieve configurable and diverse architectures. 5 According to the different construction methods, polyoxometalate-based porous materials can be roughly divided into four categories: (a) porous materials formed by covalent bonds with polyoxometalates as building units; [6][7][8] (b) supramolecular porous materials composed of polyoxometalate anions and cations (clusters); [9][10][11] (c) porous materials as the main body of the hybrid materials loaded with polyoxometalates; 12,13 (d) porous materials directly constructed from polyoxometalates. 14,15 Most polyoxometalate-based porous complexes are limited to polyoxometalate anions with known structures such as Keggin, Anderson or Dawson type as "molecular adapters", which are obtained by non-covalent or covalent action.…”