22 October 2020 3 8K Report

Greetings.

During experiments and reading about MOFs, I found something that is strange to me.

For instance, in MIL-100/101, the secondary building units (SBUs) are [M3(μ3-O)(O2CR)6L3]n+/m−, while some reports claim that their as-synthesized MOFs are constructed by [M3(μ3-OH)(O2CR)6L3]n+/m−.

Both of these SBUs are 6-connected, topologically they are the same. But from the aspect of chemistry, O-center or OH-center makes a lot differences especially in the valances of related metal ions (for instance, Co2+ or Co3+, Fe2+ or Fe3+, etc.) and in the counter ions in pores/L sites (like dimethylammonium ions, coordinated fluoride ions).

I am wondering, is there any way that we could determine the actual form of this 'center' ?

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