Synthesis and Structural Characterization of ... - Jacobs University

Amal H. Ismail
Ph.D. Thesis
Figure 5.6. Polyhedral representations of the {TeW 15 } and the basic building-block unit {W 5 }
of (27). The color code is as follows: W 3 (green), W 2 (red), Te (blue). The two subunits were
colored differently for clarification. ....................................................................................... 177
Figure 5.7. Thermogram of Na-26. ....................................................................................... 179
Figure 5.8. IR spectra of the sodium salts of [H 2 Te 4 W 20 O 80 ] 22-
(26, red curve),
[NaTeW 15 O 54 ] 13− (27, blue curve), and paradodecatungstate [H 2 W 12 O 42 ] 10− (violet curve). . 179
Figure 5.9. IR spectrum of the compound Na-28. ................................................................. 186
Figure 5.10. Polyhedral (upper) and ball-and-stick (lower) representations of
[H 2 Te 24 Mo 44 O 198 ] 34− . The color code is as follows: MoO 6 octahedra (red); Te (blue), Mo
(black); O (red)....................................................................................................................... 189
Figure 5.11. Polyhedral representation of the asymmetric {HTe 12 Mo 22 O 98 } half-unit. The
color code is as follows: MoO 6 octahedra (green, red, light blue); Te (blue); O (red), monoprotonated
oxygen (orange). The MoO 6 octahedra were colored differently for clarity. ...... 190
Figure 5.12. Polyhedral representation of the building blocks forming the hexa- and decamolybdates,
{Mo 6 } and {Mo 10 }, units. The color code is as follow: Mo 3 (green), Mo 2 (red),
Mo 1 (light blue), Mo 4 (red). The four subunits were colored differently for clarification. ... 192
Figure 5.13. Thermogram of Na-28. ..................................................................................... 194
Figure 5.14. IR spectra of K-29 (black curve), K-30 (blue curve) and K-31 (green curve)
measured on KBr pellets. ....................................................................................................... 201
Figure 5.15. Combined ball-and-stick/polyhedral representation of [Cu 3 (H 2 O)(B-β-
GeW 9 O 33 (OH))(B-β-GeW 8 O 30 (OH))] 12– (29). Polyhedra represent WO 6 (red or orange) and
the balls represent germanium (yellow), copper (blue) and oxygen (red). The rotated WO 6
octahedra are shown in orange for clarity. ............................................................................. 203
Figure 5.16. Possible Two-Step Transformation Pathway of [γ-GeW 10 O 36 ] 8– Resulting First in
(B-β-GeW 8 O 31 ) via a Loss of Two Edge-Shared, Rotated WO 6 Octahedra, and Then in (B-β-
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