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- W1964442007 abstract "The structure of Na5[Cu{TeO4(OH)2}2]·16H2O has been determined by X-ray structure analysis. It crystallises in the triclinic space group P with a= 5.922(4), b= 8.939(2), c= 12.528(2)Å, α= 98.45(1), β= 99.11(3), γ= 93.82(4)°, and Z= 1. The structure was refined to R= 0.040 for 2 131 observed reflections [F > 3σ(F)]. The composition of the crystal examined was deficient in sodium leading to a proposed formula Na5–xHx[Cu{TeO4(OH)2}2]·16H2O (x= 0.64). The discrete centrosymmetric anion contains CuIII with approximately square-planar CuO4 groups linked by trans edges to TeO4(OH)2 octahedra [Cu–O 1.833(4) and 1.839(4)Å]. The [M{TeO4(OH)2}2]5– ions (M = Cu, Ag, or Au) have been studied by i.r., u.v.–visible, and n.m.r. (125Te, 109Ag, and 17O) spectroscopy. For [Ag{TeO4(OH)2}2]5– the 125Te n.m.r. signal (+774 p.p.m.) is a doublet [2J(107,109Ag–125Te)= 73 Hz]. For the silver(III) ions [Ag{TeO4(OH)2}2]5– and [Ag{IO5(OH)}2]5– the 109Ag n.m.r. signals occur at ca.+2 800 p.p.m. from Ag+(aq)." @default.
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- W1964442007 date "1988-01-01" @default.
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- W1964442007 title "Co-ordination chemistry of higher oxidation states. Part 26. Spectroscopic studies of tellurate complexes of the trivalent Group 1B metals. X-Ray structure of Na<sub>5</sub>[Cu{TeO<sub>4</sub>(OH)<sub>2</sub>}<sub>2</sub>]·16H<sub>2</sub>O" @default.
- W1964442007 doi "https://doi.org/10.1039/dt9880001377" @default.
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