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Chapter 4 - Jacobs University

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

Unpublished Results<br />

9.3.7.2 Results and discussion<br />

The polyanion [Hf(BW 11 O 39 ) 2 ] 14- (26) (Figure 9.74) is composed of one hafnium and two<br />

units of [α-BW 11 O 39 ] 9- . The compound 26a was characterized in the solid state by single-crystal<br />

XRD, and IR. The hafnium atom is bridged between two lacunary Keggin species and the<br />

coordination number of Hf 4+ is eight.<br />

Figure 9.74 Polyhedral/ball and stick type structural representation of 26. Color scheme Hf, B and WO 6 units are<br />

shown by light green, green and red respectively.<br />

233

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