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Chapter 4 - Jacobs University

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<strong>Chapter</strong> 9<br />

Unpublished Results<br />

Figure 9.68 TGA spectrum of 24a.<br />

9.3.5.1 Results and discussion<br />

The polyanion [Hf 4 (OH) 6 (H 2 O) 4 (β-SiW 10 O 37 ) 2 ] 10- (24) (Figure 9.69) consists of two β -<br />

[SiW 10 O 37 ] 8- units sandwiching a [Hf 4 (OH) 6 (H 2 O) 4 ] 10+ cluster. All hafnium ions have a<br />

coordination number of seven. The Hf cluster has an inversion center, thus polyanion 24 has an<br />

idealized C i symmetry.<br />

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