Insight into hexanuclear peroxotantalum complexes: synthesis, characterization, and efficient catalyst for amidation reaction

Polyoxometalate catalysts for the synthesis of N-heterocycles

“…In certain reactions, the nucleophilic nature of polyanions with large negative charges makes them good Lewis bases for promoting the reaction. Recent efforts have been focused on the design and assembly of new POMs and their applications in the synthesis of N-heterocycles [109][110][111]. O, benzoazoles and pyrazoles can be obtained with yields of 64%-99% through the condensation cyclization reactions of 2-aminophenols/sulfonyl hydrazides and dicarbonyl compounds (Fig.…”

Recent studies on the reaction of [X6O19]8− (X = Nb, Ta) polyanions under acidic conditions

“…Considering the properties of POMs, mixed-addendum PONb/Ta clusters and hetero-peroxo-PONb/Ta clusters hold promising potential in many fields, including photocatalysis, thermocatalysis, proton conductivity, 60,79,81,92,97 magnetic properties, 48,68 luminescence properties, 41,58,93 and various other applications. Among them, photoelectrocatalysis has been extensively researched, including electrocatalytic reduction of nitrite 40,54 and bromate ions, 70 photocatalytic hydrogen evolution, 42,43,47,67,[74][75][76][77]80,83,85 organocatalysis, 30,34,[62][63][64]82,84,96,97 and the degradation of RhB. 45,94 In this section, only a selection of representative results will be introduced.…”

“…80 These findings open new opportunities for the development of highly efficient photocatalysts and the advancement of polytantalotungstate chemistry. Moreover, numerous POMs have demonstrated efficient catalytic performance in diverse reactions, including cyanosilylation, 62,82 primary amine coupling, 84 Knoevenagel condensation, 98 amidation, 96 imidation, 95 N-aryl-tetrahydroisoquinoline synthesis, 64 and visible-light-mediated aerobic benzylic C-H oxidations. 63 Moreover, owing to their capability to store and release electrons, POMs stand as promising candidates in the design of electrode materials.…”

Two resistance-switchable hybrid polyoxotantalates based on {Co2Ta12} clusters

“…[29][30][31] To date, only a tiny number of POTas have been discovered. [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] The reasons for the limited development of POTas include the chemical inertness of the tantalite species, the lack of soluble POTa precursors, the narrow reaction pH range (10)(11)(12), the low aqueous solubility of the common [Ta 6 O 19 ] 8− precursor, and the chemical incompatibility between POTas and other metal cations. It is worth noting that POTas have been shown to have significant application value in the fields of virology, photocatalysis, proton conductivity and base catalysis.…”