Wydział Chemii

Halyna I. Buvailo

Valeriya G. Makhankova

Vladimir N. Kokozay

Igor V. Zatovsky

Irina V. Omelchenko

Svitlana V. Shishkina

Piotr Zabierowski

Dariusz Matoga

Julia Jezierska

2016

European Journal of Inorganic Chemistry

5456-5466

10.1002/ejic.201600976

Naukowa

Angielski

Artykuł

Two simple pathways using metallic copper or copper salts are proposed for the synthesis of hybrid compounds under mild conditions. A variety of Strandberg- and mixed-metal Keggin-based products, namely, (NH₄)_5n{[Cu(en)₂][PMo₈V₄O₄₀]}_n·9nH₂O (1), (NH₄)_4n{[Cu(en)(H₂O)][P₂Mo₅O₂₃]}_n·3.5nH₂O (2), (NH₄)₇[PMo₈V₄O₄₀]·17H₂O (3) and (NH₄)_2n{[Cu(en)₂][Cu(en)(H₂O)][P₂Mo₅O₂₃]}_n·3nH₂O (4), were isolated upon the variation of the composition of the reaction system. A rare four-substituted [PMo₈V₄O₄₀]^7– Keggin anion was obtained. The influence of the vanadium source [V₂O₅, NH₄VO₃ or (NH₄)₂V₆O₁₆] and the copper precursor (copper powder vs. copper salts) on the nature of the resulting products was studied. An ex situ electron paramagnetic resonance (EPR) spectroscopy study revealed the formation of V^IV and Cu^II centres in the reaction mixture during Cu⁰ dissolution. The obtained compounds possess electrocatalytic activity in the reduction of iodate and nitrite anions, and a carbon-paste electrode modified with 4 exhibited a linear current response to l-cysteine. Furthermore, 4 demonstrated rapid and almost complete adsorption of a cationic dye.

Polyoxometalates, copper, molybdenum, vanadium, adsorption, synthetic methods

http://dx.doi.org/10.1002/ejic.201600976

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