See +references herein:

Polyoxometalates: Building Blocks for Functional

Nanoscale Systems

De-Liang Long, Ryo Tsunashima, and Leroy Cronin*

Angew. Chem. Int. Ed. 2010, 49, 1736 – 1758

DOI: 10.1002/anie.200902483

Please find the attached paper

Thanks

Hi

Please see also this paper on heteropoly acid 

Best regards

https://doi.org/10.1016/j.cclet.2014.12.018

https://s100.copyright.com/AppDispatchServlet?publisherName=ELS&contentID=0021951783900118&orderBeanReset=true

https://doi.org/10.1016/j.apcata.2005.02.013

https://doi.org/10.1016/j.jcat.2011.11.004

https://doi.org/10.1016/j.cclet.2014.12.018

https://s100.copyright.com/AppDispatchServlet?publisherName=ELS&contentID=0021951783900118&orderBeanReset=true

https://doi.org/10.1016/j.apcata.2005.02.013

https://doi.org/10.1016/j.jcat.2011.11.004