Deciphering the Spatial Arrangement of Metals and Correlation to Reactivity in Multivariate Metal–Organic Frameworks

Thirty-six
porphyrin-based metal–organic frameworks (MOFs)
with composition of (M3O)2(TCPP-M)3 and M3O trigonal SBUs of various metals,
Mg3O, Mn3O, Co3O, Ni3O,
and Fe3O including mixed-metal SBUs, MnxFe3–xO, NixFe3–xO, CoxNi3–xO, MnxCo3–xO, MnxMg3–xO, and MnxNi3–xO were synthesized
and characterized. These multivariate MOFs (MTV-MOFs) were examined
by X-ray photoelectron spectroscopy, UV–vis diffuse reflectance
spectra, and for the first time, their metal spatial arrangement deciphered
and were found to exist in the form of either domains or well-mixed.
We find that MTV-MOFs with well-mixed metals in their SBUs, rather
than the SBUs having one kind of metal but different from one SBU
to another, perform better than the sum of their parts in the test
reaction involving the photo-oxidation of 1,5-dihydroxynaphthalene.