Synthesis and Structural Characterization of ... - Jacobs University

Chapter 4
Unpublished Results
Figure 4.8. Thermogram of KLiNaGd-25.
The novel open ring phosphotungstate [P 8 W 49 O 189 ] 44− (P 8 W 49 ) is unprecedented
structurally and chemically. Other open and closed ring derivatives of the P 2 W 12 subunit are
known in literature. Wang et al. have very recently reported
[K 3 {GdMn(H 2 O) 10 }{HMnGd 2 (Tart)O 2 (H 2 O) 15 }{P 6 W 42 O 151 (H 2 O) 7 }] 11− and
[K 3 {GdCo(H 2 O) 11 }{P 6 W 41 O 148 (H 2 O) 7 }] 13− polyanions which contain a crown-type
polyanion shell [{WO(H 2 O)} 3 {P 2 W 12 O 48 } 3 ] 30− (P 6 W 39 ) with the vacant site having three or
two W(VI) ions in addition to the transition metal ions as “guest” ions. [14e] The three units of
P 2 W 12 are connected by three WO(H 2 O) fragments via corner-sharing octahedra, leading to
the closed ring derivative of P 2 W 12 unit. Recently, our group reported the opened ring
derivative of the P 2 W 12 unit, uranyl-containing “U-shaped” P 6 W 36 polyanion
[Li(H 2 O)K 4 (H 2 O) 3 {(UO 2 ) 4 (O 2 ) 4 (H 2 O) 2 } 2 (PO 3 OH) 2 P 6 W 36 O 136 ] 25- . 17
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