Preparations and properties of transition-metal pterin complexes. Models for the metal site in phenylalanine hydroxylase

Syntheses and physical properties of pterin and pteridine complexes for first-row transition metals are described. Characterization used single-crystal x-ray diffraction, spectroscopic, and microanalytical methods. These data all indicate that pterin and pteridine ligands chelate via oxygen and nitrogen atoms. Three copper complexes have been structurally determined. Cu(tppb)(pterin) [tppb − =tris(3-phenylpyrazolyl)hydroborate] crystallizes in the triclinic space group P1