Abstract
Under hydrothermal conditions, two families of new CuII-substituted sandwich-type germanotungstates (GTs): Cu6-GTs (enH2)2[Cu(en)2]2[Cu6(en)2(H2O)2(B-α-GeW9O34)2]⋅4H2O (1), H4[Cu(deta)(H2O)]2[Cu6(en)2(H2O)2(B-GeW9O34)2]⋅8H2O (2), [Cu(en)(H2O)2]2[Cu(en)2]2[Cu6(en)2(H2O)2(B-α-GeW9O34)2]⋅8H2O (3) (en=ethylenediamine, deta=diethylenetriamine) and Cu4-GTs H4[Cu(H2O)4]2[Cu(H2O)5]2[Cu4(H2O)2(B-α-GeW9O34)2]⋅8H2O (4), H10[Cu(H2O)3(Cl)]2[Cu4(B-α-GeW9O34)2]⋅8H2O (5), H8[Na(H2O)4]2[Cu(H2O)3(Cl)]2[Cu4(B-α-GeW9O34)2]⋅8H2O (6) have been made and characterized. Single-crystal structural analyses indicate that 1–3 contain a belt-like hexa-CuII substituted sandwich-type [Cu6(en)2(H2O)2(B-α-GeW9O34)2]8+ unit. Notably, 1–3 are rare organic-inorganic hybrid polyoxometalates with [Cu6(en)2(H2O)2(B-α-GeW9O34)2]8− subunits, displaying the assembly from 1-D chain to 3-D framework by the [Cu(en)2]2+ or [Cu(deta)2(H2O)]2+ linkers. 4–6 contain rhomb-like tetra-CuII substituted sandwich-type [Cu4(H2O)n(B-α-GeW9O34)2]12− (n=2, 0) units linked by [Cu(H2O)4]2+ or [Cu2(H2O)6Cl2]+ clusters to from 1-D chain. Magnetic measurements performed on 3 indicate the occurrence of ferromagnetic interactions within the copper ions. Furthermore, the electrochemical and electro-catalysis properties of 3 have been studied in 0.02 M H2SO4 + 0.5 M Na2SO4 solution, and show good electro-catalytic activity to the reduction of nitrite.
Original language | English |
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Pages (from-to) | 7559-7565 |
Number of pages | 7 |
Journal | ChemistrySelect |
Volume | 4 |
Issue number | 25 |
DOIs | |
Publication status | Published - 5 Jul 2019 |
Keywords
- Cu-substituted
- germanotungstate
- polyoxometalates
- sandwich-type