Please use this identifier to cite or link to this item: https://scholarhub.balamand.edu.lb/handle/uob/1575
Title: 15-Copper(ii)-containing 36-tungsto-4-silicates(iv) [Cu15O2(OH)10X(A-α-SiW9O34)4]25- (X = Cl, Br) : synthesis, structure, magnetic properties, and electrocatalytic CO2 reduction
Authors: Bassil, Bassem 
Haider, Ali
Ibrahim, Masooma
Mougharbel, Ali S.
Bhattacharya, Saurav
Christian, Jonathan H.
Bindra, Jasleen K.
Dalal, Naresh S.
Wang, Meng
Zhang, Guangjin
Keita, Bineta
Rutkowska, Iwona A.
Kuleszag, Pawel J.
Kortz, Ulrich
Affiliations: Department of Chemistry 
Issue Date: 2018
Part of: Journal of dalton transactions
Volume: 47
Issue: 35
Start page: 12439
End page: 12448
Abstract: 
The 15-copper(ii)-containing 36-tungsto-4-silicates [Cu15O2(OH)10X(A-α-SiW9O34)4]25- (X = Cl, 1; Br, 2) have been prepared in 70% yield by reaction of the trilacunary 9-tungstosilicate precursor [A-α-SiW9O34]10- with Cu2+ ions in aqueous pH 8 medium. Both polyanions 1 and 2 were isolated as hydrated mixed potassium/sodium salts and characterized in the solid state by FT-IR, TGA, single-crystal XRD, and elemental analysis. DC magnetic susceptibility measurements from 1.8-300 K established the ground state to be paramagnetic with a magnetic moment corresponding to 15 uncoupled Cu2+ (S = 1/2) ions. EPR measurements and simulations were consistent with this analysis. Electrochemical studies were performed for polyanions 1 and 2 dissolved in solution to elucidate the electroactivity of both copper and tungstate sites. Using 2 as a representative example, the electrocatalytic activity towards CO2 reduction upon deposition on a glassy carbon electrode surface, while retaining selectivity relative to hydrogen evolution, was demonstrated.
URI: https://scholarhub.balamand.edu.lb/handle/uob/1575
Type: Journal Article
Appears in Collections:Department of Chemistry

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