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Chapter 3 Published Results Figure 3.13. Representation of polyanions 11 and 12 forming dimers in the solid state. The color code is as follows: WO 6 octahedra (red and geen); Ln (blue); H 2 O (pink). 83
Chapter 3 Published Results Polyanions 11 and 12 were formed by following the same synthetic procedure of the {Ln 2 W 22 } family reported by us recently. 10 The formation mechanism appears to be a classical tungstate condensation in aqueous acidic medium mediated by lanthanide ions (molar ratio 14:1). Besides 11 and 12 we were also able to synthesize other members of the novel {W 28 } family, namely for Ln = La, Ce, Pr, Nd and Gd as determined by FTIR and preliminary single-crystal X-ray diffraction analysis, see Figure 3.14. Figure 3.14. IR spectra of the seven isotructural derivatives of the {Ln 2 W 28 } family with Ln = La, Ce, Pr, Nd, Sm, Eu and Gd (from top to bottom). 84
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