Synthesis and Structural Characterization of ... - Jacobs University

Amal H. Ismail
Ph.D. Thesis
Figure 1.11. Combined polyhedral/ball-and-stick representation of [Ln(W 5 O 18 ) 2 ] n– . Red
octahedra: WO 6 , blue ball: lanthanide. ..................................................................................... 27
Figure 1.12. Combined polyhedral/ball-and-stick representation of [H 6 Ce 2 (H 2 O)ClW 15 O 54 ] 7− .
Red octahedra: WO 6 , blue balls: cerium, red ball: oxygen, pink ball: H 2 O, yellow ball:
chlorine. .................................................................................................................................... 28
Figure 1.13. Combined polyhedral/ball-and-stick representation of [YbAs 2 W 20 O 68 (H 2 O) 3 ] 7− .
Red octahedra: WO 6 , green balls: As, red ball: O, blue ball: Yb. ............................................ 30
Figure 1.14. Combined polyhedral/ball-and-stick representation of [{La(CH 3 COO)(H 2 O) 2 (α 2 -
P 2 W 17 O 61 )} 2 ] 16− . Red octahedra: WO 6 , green balls: P, blue balls: La, grey balls: C, red balls:
O. No hydrogen atoms shown. ................................................................................................. 31
Figure 1.15. Combined polyhedral/ball-and-stick representation of [Ln(β 2 -SiW 11 O 39 ) 2 ] 13− .
Red and yellow octahedra: WO 6 , green balls: silicon, blue balls: lanthanide, the rotated triad
was colored yellow for clarification. ........................................................................................ 31
Figure 1.16. Combined polyhedral/ball-and-stick representation of
[Ce 20 Ge 10 W 100 O 376 (OH) 4 (H 2 O) 30 ] 56− . Red octahedra: WO 6 , green balls: Ge, blue balls: Ce, red
ball: O. ...................................................................................................................................... 32
Figure 1.17. Combined polyhedral/ball-and-stick representation of
[KP 8 W 48 O 184 (H 4 W 4 O 12 ) 2 Ln 2 (H 2 O) 10 ] 25− . Note that the K + ion is disordered over 2 positions,
and the two Ln 3+ ions are disordered over four positions (for details see reference 49). The
color code is as follows: tungsten octahedra WO 6 (red and yellow), lanthanide (blue),
potassium (grey), and oxygen (red).......................................................................................... 33
Figure 3.1. IR spectra of the ten compounds NaLa-1, NaCe-2, NaTb-3, Na-4, NaHo-5, Na-6,
Na-7, Na-8, NaLu-9, and Na-10 (from bottom to top). .......................................................... 55
Figure 3.2. Formation scheme of two different isopolydodecatungstates (left), and two
lanthanide containing isopolytungstates (right) as a function of pH. The color code is as
follows: W (black); O (red); Ln (blue); H 2 O (pink)................................................................. 60
xi