摘要:
Distal H-bonding to axial ligand is strategically introduced in metalloporphyrin models by modifying porphyrin xanthene acid in which the carboxyl proton is preferentially H-bonded to the xanthene oxygen. Xanthene carboxamide is able to deliver intramolecular H-bonding and simultaneously lock into a well-defined conformation. Multipoint recognition of ligand is demonstrated in an amidinium-acetate-Zn porphyrin complex, mimicking a structural feature found in sulfite reductase.(C) 2003 Elsevier Science B.V. All rights reserved. Distal H-bonding to axial ligand is strategically introduced in metalloporphyrin models by modifying porphyrin xanthene acid in which the carboxyl proton is preferentially H-bonded to the xanthene oxygen. Xanthene carboxamide is able to deliver intramolecular H-bonding and simultaneously lock into a well-defined conformation. Multipoint recognition of ligand is demonstrated in an amidinium-acetate-Zn porphyrin complex, mimicking a structural feature found in sulfite reductase. (C) 2003 Elsevier Science B.V. All rights reserved.