Dear,
I want to know whether there is any quantitative method to know the concentration of Co(II) in polyoxometalates. There are two questions, first, how to free the cobalt from the polyoxometalate, then how to determine the percentage of cobalt quantitatively. Example of these molecules can be found here: http://onlinelibrary.wiley.com/doi/10.1002/zaac.200900072/abstract
There is no general answer to your question, it depends on POM. If you have a solid POM, do an elemental analysis. Some strong chelators can pull out Co from POM in solutions. Check publications in my profile.
Lets say [Co4(H2O)2(PW9O34)2]10− as an example, how to know the percentage of cobalt,
I have done EDS-SEM. Is this the only way to know that?
thank you
You may find the answer in this paper
Differentiating Homogeneous and Heterogeneous Water Oxidation Catalysis: Confirmation that [Co4 (H2O) 2 (α-PW9O34) 2] 10–Is a Molecular Water Oxidation Catalyst
JW Vickers, H Lv, JM Sumliner, G Zhu, Z Luo, DG Musaev, YV Geletii, ...
Journal of the American Chemical Society 135 (38), 14110-14118
I think that the best method to determine the concentration of cobalt incorporated in Dawson complexes is absorption atomic spectroscopy (AAS). In order to proceed to analysis, it must to leach the cobalt metal from the material by using "regal water" and with heating. So, the obtained solution can then easily analyzed using the appropraite lamp of cobalt.
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