Anderson-type polyoxometalate-based sandwich complexes bearing a new “V”-like bis-imidazole-bis-amide ligand as electrochemical sensors and catalysts for sulfide oxidation

Abstract

By introducing a new "V"-like semirigid bisimidazole-bis-amide ligand, 4,4'-bis(1H-imidazole-4carboxamide)phenylmethane (L), into a reaction system containing Anderson-type polyoxoanions, three polyoxometalate-based metal-organic complexes (POMOCs) with different metal ions were successfully synthesized under solvothermal conditions. The as-prepared POMOCs5H 2 O (3) show sandwich-like supramolecular structures. Complexes 2 and 3 are isostructural, having two [ML(H 2 O) 2 ] 2+ chains with [AlMo 6 (OH) 6 O 18 ] 3− polyoxoanions as pendants arranged in an interdigital mode to construct the sandwich-like architecture, whereas in complex 1 the anionic [Zn(H 2 O) 2 (TeMo 6 O 24 )] 4− chain is sandwiched by two cationic [ZnL(H 2 O) 2 ] 2+ chains to generate the supramolecular structure. POMOCs 1-3 display excellent electrochemical sensing behavior for Cr(VI), Fe(III), BrO 3 − , and NO 2 − ions and efficient catalytic performance in sulfide oxidation. The effect of the central metal on the electrochemical sensing and sulfide oxidation performance and that of the special architecture of 1 on the detection ability are discussed.

Polyoxometalate–Viologen Thermochromic Hybrids for Organic Amine Detectors and Memristors with Temperature-Regulating Resistance Switching Characteristics

“…Polyoxometalates (POMs) are a class of anionic inorganic clusters with various structural topologies, − which have attracted extensive attention in various research fields, such as catalysis, , optics, medicine, and magnetism. − Moreover, because POMs are rich in electrons, they can be used as electron donors in the process of induced electron transfer by light, electricity, and heat, which can contribute to the construction of inorganic multiple stimulus discoloration materials . In addition, due to the wide variety of POMs, it will also be beneficial to the popularization of chromic material applications of POMs.…”

New pyrimidine-amide-tetrazole ligand derived polyoxometalate-based copper complexes as catalysts for sulfide-sulfoxide transformation and electrochemical sensors

“…Compared with 1, the reason for the decrease of catalytic effect may be ascribed to different POM anions. 32,33 Due to the better catalytic performances of complex 1, further experiments were carried out with 1 as an example.…”

Latest progress in asymmetrically functionalized Anderson-type polyoxometalates

“…Anderson-type POMs are one of the most important groups of the POM family. 18–20 They play an important role in electrocatalytic oxygen evolution, 21 oxidative desulfurization, 22,23 dye degradation, 24 antibacterial activity 9 and other application areas. 25 The structure of Anderson POMs was proposed by J. S. Anderson in 1937, and then confirmed by H. T. Evans using X-ray.…”