The hydrothermal reactions of MoO(3), tetrapyridylporphyrin (tpypor), water, and the appropriate M(II) precursor yield the first examples of three-dimensional framework materials constructed from metal oxide and porphyrin subunits. The picture shows a section of [{Fe(tpypor)}(3)Fe(Mo(6)O(19))(2)] small middle dotx H(2)O with the [Fe(8)(tpypor)(6)](8+) building block of the cationic framework and the entrained {Mo(6)O(19)}(2-) cluster.
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Hagrman et al. (1999) studied this question.