Diversity of Polyoxometalate‐Based Copper Compounds Obtained from the Same Reaction System. Issue 35 (15th November 2016)

• Record Type: Journal Article
• Authors: Buvailo, Halyna I.; Makhankova, Valeriya G.; Kokozay, Vladimir N.; Zatovsky, Igor V.; Omelchenko, Irina V.; Shishkina, Svitlana V.; Zabierowski, Piotr; Matoga, Dariusz; Jezierska, Julia
• Is Part Of: European journal of inorganic chemistry. Issue 35(2016)
• Page Start: 5456
• Page End: 5466
• Publication Date: 2016-11-15
• Subjects: Polyoxometalates -- Copper -- Molybdenum -- Vanadium -- Adsorption -- Synthetic methods; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201600976
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : 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 )5 n {[Cu(en)2 ][PMo8 V4 O40 ]} n · 9 n H2 O (1 ), (NH4 )4 n {[Cu(en)(H2 O)][P2 Mo5 O23 ]} n · 3.5 n H2 O (2 ), (NH4 )7 [PMo8 V4 O40 ]· 17H2 O (3 ) and (NH4 )2 n {[Cu(en)2 ][Cu(en)(H2 O)][P2 Mo5 O23 ]} n · 3 n H2 O (4 ), were isolated upon the variation of the composition of the reaction system. A rare four‐substituted [PMo8 V4 O40 ] 7– Keggin anion was obtained. The influence of the vanadium source [V2 O5, NH4 VO3 or (NH4 )2 V6 O16 ] 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 Cu 0 dissolution. The obtained compounds possess electrocatalytic activity in the reduction of iodate and nitrite anions, and a carbon‐paste electrode modified with4 exhibited a linear current response tol ‐cysteine. Furthermore, 4 demonstrated rapid and almost complete adsorption of a cationic dye. Abstract : Four compounds based on P/Mo Strandberg and P/Mo/V Keggin anions are obtained under mild conditions. The nature of the products depends substantially on the V reagent. The use of Cu 0 or its salts both led to identical compounds. The complexes demonstrate promising electrocatalytic activity and rapid dye adsorption.