Abstract
The pteridine and (iso)alloxazine p systems are the underlying heterocyclic structures of coenzymic constituents (pterins, lumazines, flavins) of oxidoreductase enzymes. These mols. are potential ligands for metal centers which, in the absence of addnl. coordination sites, bind predominantly through O(4) and N(5) to form five-membered, redox-active a-iminoketo chelate rings. Recent results from spectroscopic and electrochem. studies and structural data are summarized in this article. on SciFinder(R)
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