Environmental Engineering Reference
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Figure 18.13 Chemical structures of selected cofacial strapped diporphyrins (a), pillared
diporphyrins (b), and pillared porphyrin/corrole, dicorrole, and diphthalocyanine derivatives
(c) whose metal complexes have been studied as ORR catalysts. Conventional notations for
the structures are also listed (in bold). Other molecular architectures of cofacial porphyrins
are known, but the corresponding complexes have not yet been studied as ORR catalysts.
series characterized most thoroughly. Several tentative inferences can be made from
this data:
†
Catalytic selectivity does not appear to correlate with the (average) M - M
distance (in the absence of any ligands in the cavity) or, more broadly, the sep-
aration of the centers of the two porphyrins (Ct - Ct): the best ORR catalysts are
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